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  • Five factors determining the accuracy of different geophysical methods to find water and well
    When drilling a well to find water, if you use a water detector, you must consider the problem. Is the accuracy high? The accuracy of any type of water detector should be based on the principle method, instrument performance, detection accuracy, The detection method and the application of several aspects are used for comprehensive evaluation. First, the principle and method of geophysical instrument determine the accuracy of its water and well At present, the most long-time users are the electrical instruments of the artificial field source time domain (including resistivity method). Instrument, high-density resistivity method, excitation polarization method), because it is limited by the depth of the earth feeding, the geographical environment of the cable, the high-resistance and low-resistance of the underground, and so on, combined with the labor and long time The well location is selected only by the sounding data of several points detected in one day. It can only be speculated whether there is a fault structure, the depth of the aquifer, and the location of the detected points, but for the underground faults and fissures. The location and orientation of the structure, the distribution of the aquifer, etc. are not known. Just like a scorpion touching an elephant, just touching a few points, it is hard to imagine the appearance of an elephant. Second, the performance indicators of geophysical instrument hardware determine the accuracy of picking up underground lithology information. Although the principles and implementation methods of many geophysical methods are different, the purpose is to pick up as much as possible. Take useful information about underground lithology. First, the probe of the primary pick-up signal is sensitive, and it can pick up the weak electromagnetic signal of the microvolt level. Second, the amplification factor and linearity of the signal are high, so that the precision amplification is not distortion; the third is strong anti-interference ability. Various filtering methods remove high frequency and high frequency interference; Fourth, the accuracy of the analog-to-digital conversion and control devices used is high enough to be accurate to 0.01 or 0.001 microvolts. Third, the resolution of the detectable underground depth layer determines the accuracy of finding water and fixing wells. Just as the higher the resolution of the TV is, the more clearly it is, the more the depth depth layer that can be detected, the more layered The finer the resolution, the more the detected underground lithology information becomes clearer, and the accuracy of the well is definitely higher. The detection depth of the electric instrument depends on the length of the two-wire cable feeding to the earth. The data measured by the 100-meter cable of the cable contains comprehensive information within 100 meters of the underground. The length measured by one length is the depth layer of the point. Data, in theory, can be infinitely layered to increase resolution, but time is not allowed. Generally, it is detected in the shallow part by 10 meters/layer, and the distance between the layers is gradually increased by 100 meters. Even if such a detection point is tossed for about 2 hours, it is good to do the sounding of four or five points a day. It is very important to find more water and to rely on hydrogeological knowledge and analysis and judgment of limited detection data. For the natural field source geophysical instrument, the most common manufacturer on the market is the natural electric field frequency selector. There are 3 frequency points for detection, and there are also 5 frequency points. According to the principle of convergence depth effect, each frequency point corresponds to one depth layer. Only three or five depth layers should reflect the geological conditions of 300 meters underground. The accuracy is definitely not enough. Even the imported geophysical instrument EH-4, which sells for up to 670,000, can only detect 20 depth layers above 800 meters, and the detection accuracy is limited. Fourth, the geophysical data analysis method determines the accuracy of its water and well drilling Generally, there are two methods for the geophysical instrument to directly display the detection data for analysis. One is a single point deep. The connection diagram of the degree data, the electric instrument can only perform single point sounding analysis because of the small number of detection points; the other is the connection diagram of the data of each detection point of a certain depth layer, the tri-frequency point frequency selector can A connection diagram of 3 depth layers is made to observe the changes in the lithology of the 3 deep depth layers on the detection line. All instruments, including imported instruments such as V8, GDP32, and EH4, can indirectly input the detection data into the Surfer drawing software to draw a color two-dimensional contour map of the detection line. The only difference is that the more valid data is input. The more realistic the image reflects the underground situation, some of the graphics masters can use the Surfer software to draw a nice color equivalent color map with only three or four points of sounding data. 5. Field exploration work and experience have a great influence on the accuracy of finding water and wells. Even if you use the same kind of geophysical instrument, the method of spot detection in the field, the understanding of geology, The accuracy of the actual well-fixing is directly determined by the analysis and judgment experience of the detected data. Many occupations have been looking for water for several decades. The resistivity meter and the electro-opometer are used to find the artificial field source. Water wells work, and there are also many experts, the accuracy of wells is also high. Sometimes, using high-grade imported geophysical equipment to find water and wells in water-deficient areas, like anti-aircraft guns to fight mosquitoes, the accuracy of well fixing is also not high.

    2018 12/22

  • Prevention and Treatment of Drilling Accidents in Bridge Bored Pile Foundation Construction
    Drilling accidents may occur in various drilling methods. The pupil is characterized by a sudden drop in the water level in the hole, a fine blisters in the hole, a significant increase in the amount of slag, and a significant increase in the load on the rig. 1. The mud weight is not enough and other mud performance indicators do not meet the requirements, so that the hole wall does not form a solid mud: 2. Since the water or mud is not replenished in time after the slag is slag, or the tidal water of the river rises, or the pressurized water appears in the hole, or the borehole passes through a strong permeable layer such as gravel, the water in the hole is lost, and the height of the water head in the hole is insufficient; 3. The casing is too shallow, the lower end of the hole leaks, collapses or the ground near the hole is soaked and soaked by water, or the rig is placed on the casing. The hole collapses due to vibration and expands into a larger hole. 4. Drill in the soft sand layer, the footage is too fast: 5, catch the drill cone drilling, the swing speed is too fast, the idle time is too long 6. The impact (catch) cone or the slag slag cylinder is dumped, hitting the hole wall, or the boulder, probe stone and explosive in the blasting treatment hole are too large, causing excessive vibration; 7. The water head is too large, so that the hole wall seeps or the bottom of the casing forms a reverse perforation. 8. After the clearing of the hole, the specific gravity and viscosity of the mud are reduced. 'The air suction machine clears the hole. After the mud is sucked away, the water is not replenished in time, so that the water level in the hole is lower than the groundwater level. The clearing operation is improper, and the water supply pipe directly washes the hole wall. Clear the pores for too long or pause for too long after clearing the pores. 9. Collide the wall of the hole when hanging into the steel frame. 1. When drilling in loose silt or drift sand, the progress speed should be controlled, and the mud with larger specific gravity, drilling degree and colloidal rate should be selected, or the cat soil with the mixed egg (egg) stone should be injected, and the low hammer impact can be used. Drilling earth paste and tablets (egg) stone squeeze into the wall of the hole to function as a retaining wall. 2, flood season or high tide, when the water level changes too much, should take the rise of the protective tube, increase the water head, or use siphons, connecting tubes and other measures to ensure that the water head is relatively stable. 3. When the orifice collapses, the casing can be removed immediately and the borehole can be backfilled, and the casing can be reburied and drilled again. 4. If the hole collapses, first determine the collapse position, backfill sand and cat soil (or gravel and loess) mixture to the pupil above 1--2m, if the pupil is serious, all backfill, after the backfill is densely deposited, Drilling in. 5. Strictly control the stroke height and the amount of explosives. 6. When clearing the hole, special personnel should be appointed to replenish water to ensure the necessary head height in the borehole. 1. A large arc or probe stone is encountered in the borehole; 2. At the junction of the soft and hard stratum with inclination, or drilling in the sand and gravel layer with large particle size, the bit is unevenly stressed. 3. If the hole is enlarged, the bit swings to one side; 4. The rig base is not placed horizontally or produces uneven subsidence: 5, drill pipe Bending, joint is not correct 1. When installing the drilling rig, make the turntable and bottom sit horizontally: the lifting pulley edge, the fixed drill pipe bayonet and the casing center should be on a vertical line, and check the correction frequently. 2. Since the active drill pipe is long and the upper swing is too large when rotating, a guide frame must be added to the drill frame to control the water supply head on the drill pipe so as to drill in the guide frame. 3. The drill pipe and joints should be inspected one by one and adjusted in time. When the active drill pipe is bent, the jack should be straightened in time. 4. When drilling in inclined soft and hard formations. The drill pipe should be hung with a drill rod to control the footage and drill at low speed. Or backfill the tablets and pebble before drilling. 5. After ascertaining the position and deflection of the borehole, it is generally possible to hang the drill bit up and down repeatedly at the deflection to make the borehole straight. When the deflection is severe, the sand-drilling soil should be backfilled to the skewed position, and the drilling should continue after the sedimentation is compacted. 6. When impact drilling, the gravel and loess should be backfilled and then drilled and compacted. If the deflection is severe, a small amount of explosive blasting may be set at the beginning of the deflection, and then backfilled with sand and gravel to the position above lm. Drilling. Drilling and falling objects may occur in various drilling methods. 1. Strongly twisting when the card is drilled, and improperly operating the wire rope or drill pipe; 2. Poor drill pipe joint or slippery wire; 3, the motor wiring is wrong, so that the rig should not reverse, the drill pipe is loose; 4. The impact quality of the impact bit alloy sleeve is poor, and the wire rope is pulled out; 5. The welding parts such as the steering ring and the steering sleeve are disconnected; 6. The number of wire ropes connected to the wire rope and the drill bit is insufficient or slack, or the wire rope is too old and there are too many broken wires; 7, the operation accidentally fell on the wrench crowbar and other things. Precaution: 1. Before opening the drill, the inner part of the hole should be removed. The sporadic iron piece can be used to draw larger objects and the drill can also be used to punch the cone. Then cover the mouth of the tube; 2. Always check drills, drill pipes, wire ropes and connecting devices; 3. In order to facilitate the salvage of the falling cone, the fishing ring can be pre-welded on the punching cone, salvage the bar or bundle a few rounds of wire rope on the cone. Approach: After the drill is broken, the situation should be ascertained in time. If the drill cone is buried by the sediment or the borehole soil, the hole should be cleaned first. Make the fishing tool accessible to the drill cone. There are several types of salvage tools: salvage fork, salvage hook, salvage looper, partial hook and drill cone flat hook, salvage forceps:

    2018 12/19

  • Anchors, anchors, soil nails, anchor pipes, no longer confused
    At the scene, it is generally considered that the drill holes are 150mm anchors, generally they have deep holes, thick steel bars, and prestressing. The soil nails are generally short, the hole diameter is 100mm, and only one steel bar is placed. However, what is the difference between anchors, anchor cables, soil nails and anchor pipes? I don`t know the classmates. Anchor: A member that transmits tension to a stable rock formation. When a steel strand or a high-strength steel wire bundle is used as the rod material, it may also be referred to as an anchor cable. - "Technical Specifications for Building Slope Engineering" GB50330-2002 Anchor cable: When the anchor rod body is made of high-strength steel strand, it can be called anchor cable. Soil anchor: A bolt anchored in a soil layer. - "Technical Specifications for Building Slope Engineering" GB50330-2002 A tension rod body composed of a steel bar or a steel strand disposed in a borehole and extending into a stable soil layer at the end and a grout in the hole. - "Technical Regulations for Building Foundation Pit Support" JGJ 120-99 Rock bolt: A bolt anchored in a rock formation. - "Technical Specifications for Building Slope Engineering" GB50330-2002 System anchor: In order to ensure the overall stability of the slope, the anchor group is arranged in a certain format on the slope. - "Technical Specifications for Building Slope Engineering" GB50330-2002 In order to stabilize the surrounding rock as a whole, a group of anchors arranged in a certain pattern on the periphery of the tunnel. --《Technical Specification for Anchor Shotcrete Support》GB50086-2001 Anchoring: Engineering measures to reinforce rock mass using anchors anchored in the surrounding rock or rock slope of the cavern. "Basic Terminology Standard for Geotechnical Engineering" GB/T 50279-98 Anchor retaining wall: cement rod or multi-strand wire rope is anchored in the rock as a tensile member to keep the wall stable and retain the retaining wall of the soil. "Basic Terminology Standard for Geotechnical Engineering" GB/T 50279-98 Soil nailing wall: The support structure consisting of the soil and the protective surface of the side wall of the foundation pit reinforced with soil nails. - "Technical Regulations for Building Foundation Pit Support" JGJ 120-99 Soil nail: It is based on the principle of the New Austrian tunnel law. In the slope formed by natural slope or excavation, the reinforced bar is placed horizontally in the in-situ rock and soil of the foundation pit and the concrete surface layer is set along the slope. In-situ reinforcement technology that improves the mechanical properties of the overall geotechnical system and improves the stability of slopes and foundation pits. - "Geotechnical Engineering Handbook" Lin Zongyuan Note, October 2005, 1st Edition The soil nail can be regarded as a small-sized passive anchor (some similar to the full-length bonded anchor), which is divided into two types: bored grouting nail and nailing nail. The soil nailing material is angle steel, round steel and steel bar. Or steel pipe. - "Handbook of Geotechnical Anchorage Technology" Yan Moming, Xu Yuxiang, and Su Ziyi. The latter two participated in the preparation of the Technical Specification for Anchored Shotcrete Support GB50086-2001. Anchor pipe: When the soil nailing rod body adopts a steel flower tube (that is, several grouting holes are drilled on the steel pipe), it can be called an anchor pipe. the difference The difference between soil nails and anchors is: 1. Stress mechanism 1) The soil nail is passively stressed, that is, after a certain deformation of the soil body, the soil nail is stressed, thereby preventing the soil from continuing to deform; 2) The anchor rod is actively stressed, that is, by pre-stressing the anchor rod, the excessive deformation of the soil body is restricted before the foundation pit is not excavated; 2, the range of force 1) The soil nail is full-length force, but the direction of the force is divided into two parts. The potential slip surface divides the soil nail into two parts. The direction of the first half is directed to the direction of the potential slip surface, and the back half is directed back by the force direction. In the direction of the potential slip surface; 2) The anchor is the free end of the front half and the forced section of the rear half, so sometimes the mortar is not filled in the front half of the anchor. The above statement is the difference between the non-prestressed anchor and the prestressed anchor (cable). 3. The essential difference between the two is the difference in working mechanism The soil nail is a soil reinforcement technology, which uses the densely arranged reinforced body as the soil reinforcement means to improve the strength and self-stability of the soil to be reinforced; The anchor rod is an anchoring technology, and the load of the unstable rock mass in the surface layer is transmitted to the deep stable position of the rock and soil body through the tension rod, thereby realizing the stability of the rock mass to be reinforced. When the soil is deformed, the soil nail provides resistance with this deformation, and the force characteristics are the same as those of the anchor. It's just that it's full length. The direction of the two broken forces divided by the sliding surface is the same, both pointing into the slope. Under the action of prestressing, the anchor rod is actively stressed. It always provides the resistance to the slope in the slope. It will degenerate into soil nails with the loss of prestress and the stop of the deformation of the slope. Because the understanding of some places is different, if the soil nail of the soil nail wall is named [soil nail", the unit price is very low and low according to the budget, so I and some of my colleagues tend to name it as a non-prestressed soil anchor. . This is also a problem that has to be paid attention to.

    2018 12/12

  • What should I do if the water well rig encounters these problems?
    If the pressure of the hydraulic system of the drilling rig is insufficient, the pressure of the pressure regulating valve should be adjusted to limit the nut or replace the spring; if the cone of the pressure regulating valve is damaged or stuck, the pressure regulating valve sleeve should be removed for repair; The rig joint heats up and the elastic ring is excessively worn; the reason is that the coaxiality of the rig power machine and the clutch is poor, and the assembly coaxiality needs to be improved; After the rig oil pump starts, it will not be oiled or the oil quantity is insufficient. First check whether the oil in the fuel tank is insufficient or no oil. If the oil level to the oil level is not eliminated, check whether the filter is blocked. In addition, look at the fuel tank. Whether the vent hole is blocked, or the suction pipe joint loosens the air intake; The main reason is that the brake hoist brake is slippery. The main reason is that there is oil on the inner surface of the brake belt. It is necessary to clear the inner surface of the brake. If there is no oil in the brake of the drill, check the gap between the brake belt and the brake wheel. If it is too loose, adjust it properly. The rig clutch slips, the main reason is that the friction plate is excessively worn or broken or the compression spring is aged or broken, and the rig friction plate should be repaired; The rig oil pump is hot and worn, and the oil pump must be repaired and replaced. The viscosity of the oil is too high or too low. The oil should be used strictly according to the instructions. At the same time, the transmission of the rig oil pump should be checked to improve the assembly accuracy. If the hydraulic system oil temperature is too high, the oil in the fuel tank is too small or the oil pump is damaged, it is necessary to refuel or repair the oil pump; the working pump should be selected reasonably, and the working pressure should be recommended according to the instructions.

    2018 12/05

  • Independent innovation, quality first - Hengwang Group made a wonderful appearance at Shanghai BMW Show!
    On November 27, 2018, bauma CHINA2018, with the theme of [Creating a vision, a vertical and horizontal view", was held at the Shanghai New International Expo Center. As a leader in the domestic construction machinery industry, Shandong Hengwang Group has brought a variety of new products to the exhibition. This year's exhibition has filled in a thick and colorful, high-end new products and digital display, attracting professional users from home and abroad. Favored, on-site signing, and visiting customers are endless. In the first BMW exhibition after the construction machinery industry has fully recovered, Hengwang Group adheres to the service concept of independent innovation and quality first, and is gradually deepening the brand influence to the world. In the exhibition on the day of the opening ceremony, visitors expressed a high level of interest in the new products and intelligent platform of Hengwang Group, which is considered to represent the latest trend of the construction machinery industry. A visiting customer expressed his intention to purchase after seeing the products of the pile machine. He said that the product appearance of Hengwang Group is eye-catching, and the upgraded new product has many advantages of intelligence, which is very attractive to him. Over the years, Hengwang Group has been adhering to the business philosophy of [survive by quality, develop by service", and has repeatedly sold and sold mechanical products to 138 countries and regions around the world, setting a new benchmark for the development of the national machinery industry! In the future, our group will continue to provide the best quality products and services for domestic and foreign customers as the development goal, and launch the Hengwang brand globally! Welcome more global customers to visit Hengwang Group to discuss cooperation!

    2018 11/28

  • 2018 "Shanghai BMW Exhibition" Hengwang Group is looking forward to your arrival!
    The biennial bauma CHINA 2018 (Shanghai BMW Construction Machinery Exhibition) will be unveiled at the Shanghai New International Expo Center on November 27-30, 2018. After 15 years of rooting in China, it has grown together with the Chinese construction machinery industry and continues to show new developments in the industry. Undoubtedly, the world will once again focus on China in 2018. As an extension of the German bauma exhibition in China, bauma CHINA has become the stage for the global engineering machinery enterprise competition. On this stage, there are many high-quality enterprises and products. They represent advanced productivity, carry the historical mission of industry development, enhance the degree of industrial civilization, and even change the lives of each of us...

    2018 11/20

  • [Full hydraulic drilling rig] Detailed explanation of the console problem
    Answer: Return to the oil meter - reflecting the oil return status of the hydraulic system. The hydraulic oil return system of the drilling rig is a low pressure system, and the normal oil return pressure is between 0.3 and 0.6 MPa. When the return pressure value is greater than 0.6 MPa, the problems reflected by the oil return system include: 1The oil temperature is lower, the oil return resistance is larger, and the reflected pressure value can reach 1.2MPa. This situation generally occurs in the power-on state. At this time, it is not appropriate to let the rig work immediately, because the hydraulic components of the rig return oil system are It is a low-pressure structure, and immediate work will cause the pressure of the oil return system to increase, sometimes damaging the hydraulic components. The correct method is: the rig should be idling for a few minutes, observe the return pressure gauge to lower the normal value, and then carry out the drilling work, so as to ensure the safety of the rig; 2 When the return pressure value is continuously maintained at a value and there is a tendency to increase slowly, it should be judged that the return filter of the oil return system is clogged, causing the oil return to be blocked, and the oil return filter should be performed at this time. Cleaning, when conditions are good, it is best to take the kerosene or diesel oil to clean the spare; if there is no such condition, clean it with water in the well, and clean the attached material with a small fire stick. For the cleaned oil return filter, the attached water should be cleaned to prevent water from entering the fuel tank, causing the water in the oil tank to form a state of water-in-oil or water-in-oil, resulting in premature failure of the hydraulic oil and waste; 3When the oil return pressure gauge pointer oscillates, and the noise of the suction of the main and auxiliary pumps is accompanied, it indicates that the oil suction filter in the fuel tank is blocked, and the oil suction filter must be cleaned immediately. If the main and auxiliary pumps are short-lived for a long time. Working in the oil state will cause damage to the main and auxiliary pumps, and in severe cases, a burning accident will occur. The oil absorption filter is generally cleaned with water in the well, the flocs attached to the oil absorption filter net, various kinds of slag, etc. are cleaned, and the moisture on the filter net is cleaned. In the case of pressurized wind in the well, the pressure air can also be used to purge the suction filter. When disassembling the top cover of the fuel tank, it is necessary to prevent the pulverized coal and cuttings on the fuel tank cover and the roof of the roadway from falling into the fuel tank, causing pollution to the hydraulic oil. Pump pressure gauge – reflects the rated pressure value of the hydraulic system; it also reflects the operating parameter pressure value when the motor rotates in the dual pump fuel supply system. According to the design, the system pressure value is 21 MPa, which reflects the limit value or capacity value of the equipment. The hydraulic system problems reflected by the pump pressure gauge include: 1 system pressure value is too low or simply no pressure. The problem lies in the hydraulic system safety valve. The treatment methods are as follows: firstly, the system safety valve is cleaned. Since the safety valve uses a cone valve to seal the oil, when there is a foreign matter stuck to the cone valve or the cone valve is deflected, it will cause an oily situation, so that the pressure cannot be established, and the foreign matter can be removed by cleaning the safety valve. Righting cone valves, which often occur when new valves are used. Secondly, the limit spring in the safety valve is fatigued, the spring force is insufficient to cause overflow, and the pressure does not meet the design requirements. Again, the seal "O" ring in the safety valve is damaged, causing high pressure oil to leak and pressure loss. 2 When the motor rotates in the forward or reverse direction, or the one-way force is weak, the pressure value reflected on the pump pressure gauge does not meet the parameter requirements. The problem is the one-way control valve on the rotary plate valve, or the control spring fatigue, or the plate. The remaining iron filings in the valve are obstructed, resulting in a steel ball sealing oil that is not tight enough to cause leakage and pressure relief. 3 The internal leakage of the motor is damaged, the pressure cannot be established, and the pressure value reflected by the pressure gauge is always in a lower range. Fourth, the pressure gauge is damaged. Feeding and lifting pressure gauges - reflect the rated pressure values of the incoming and outgoing systems and the values of the parameters in operation. In the dual-pump working oil circuit system, the auxiliary pump group provides oil to reflect that the system pressure value is 21 MPa. This pressure value reflects the limit value or capacity value of the feeding and pulling system; in the work, it reflects the feeding and lifting. The parameter value. The parameters reflected by the parameters of the feeding and drawing pressure gauges mainly include: firstly, reflecting the efficiency of cutting the rock by the drill in the pressurized drilling; second, reflecting the stability of the cutting rock and the mutual influence between the drill bit and the rock. Third, it reflects the gas dynamics of the borehole and the sudden accidents in the borehole channel. Sub-pump pressure gauge - reflects the pressure design value provided by the sub-pump and the parameter change value during the working process. According to the design, the secondary pump pressure value is 21 MPa, which reflects the limit value or capacity value of the equipment. The secondary pump pressure gauge reflects the problems of feeding and lifting hydraulic systems including: 1 The feed and pull-out pressure values are too low or there is no pressure. The problem is with the safety valve on the hydraulic system. The method of treatment is the same as above. 2 The pressure value does not meet the working requirements. The problem lies in the pressure relief relief valve of the auxiliary pump plate valve block. The pressure relief relief valve should be cleaned or repaired. The valve core is stuck. If it is damaged, it needs to be replaced. 3 If there is no problem in the safety valve and the relief relief valve after inspection, check whether the plate seat has machining iron scraps to hinder the check valve operation, if necessary, clean the iron filings. After the above treatment, generally The problem can be solved.

    2018 11/15

  • [Full Hydraulic Drilling Rig] Technical Q & A (2)
    A: The hydraulic control valve is used to control or regulate the pressure, flow and direction of the flow in the hydraulic system to meet the force or torque, operating speed and direction of motion of the actuator output. There are many types of control valves, and their common features are: 1 is structurally composed of a valve body, a valve core and an operation control portion. 2 In the work, the flow or flow of the liquid flow is changed by changing the on-off relationship of the valve port or the flow area of the valve port. 3 The smaller the flow area of the valve hole, the higher the flow rate, the larger the pressure drop, and the pressure difference before and after the valve hole. The working principle of various pressure control valves is to balance the oil pressure on the spool with the spring force at different positions to control the flow area of the valve port to achieve various pressure control. In the use of various types of valves, the problems are solved according to the problems reflected by the oil circuit system, and will not be described here. Answer: The function of the rotary and chuck oil circuit board valves: 1 Through the switching action of the control valve, the pinch linkage function is realized; 2 Through the switching action of the control valve, the joint action of drilling and lifting is realized. The function of the auxiliary pump oil plate valve: 1 through the interaction of the control valve and the relief relief valve to achieve pressurized overflow feed; 2 Through the interaction of the control valve and the pressure reducing valve, the chuck pressurization and decompression feeding are realized. A: The independent function of the main pump oil circuit: In the working state, the independent function of the main pump oil circuit is to provide motor rotation. Independent function of the auxiliary pump oil circuit: In the working state, the independent function of the auxiliary pump oil passage is to provide the feeding and pulling action of the cylinder, and at the same time, the chuck pressure is completed under the cooperation of the various functional valves. Main and auxiliary pump confluence: When the rotation stops and the main pump oil circuit is in the return to zero state, the main and auxiliary pump oil passages merge to realize the fast tripping working state. At the same time, the interlocking working state of the chuck and the gripper is realized under the cooperation of the functional valves.

    2018 11/12

  • How to deal with different formations when drilling wells
    Drilling is a relatively professional job. Because the operation of each step is related to the fact that the well is not strong and will cause accidents. In the process of staff construction, the failure of the well-drilling machine is the most influential problem, so what should be done when encountering such a problem? Different geological layers should be taken in different ways during the drilling of the well drilling machine, so that the good results can be achieved, and the different geological layers that are encountered are also necessary, the sand layer and the gypsum layer. It is often encountered. Once gypsum intrusion occurs in the drilling machine, the calcium ion can be removed by adding soda ash, calcium removal viscosity reducer, etc., and the viscosity-reducing agent with strong anti-calcium ability can be used to control the adhesion and replenishment. Fluid loss additives, anti-collapse agents and other materials to maintain the stability of drilling fluid performance. Before drilling the gypsum layer, pre-treat the drilling fluid, reduce the solid phase, reduce the sticking, add the anti-gypsum treatment agent (such as soda ash, calcium removal viscosity reducer, etc.) in advance, and prepare the gypsum in advance according to the adjacent well construction data. Layer of treatment agent. Increase the pH of the drilling fluid to improve the ability of small drilling machinery drilling fluids to resist gypsum contamination. When drilling the runoff formation, it is necessary to increase the viscosity of the drilling fluid and increase the content of bentonite in the drilling fluid. Generally, the requirement is more than 10%. Adding a single seal to enhance the wall-forming property of the drilling fluid, and reducing the convective sand by appropriately reducing the displacement in the project. Layer erosion, the drill must be closed with thick mud with viscosity greater than 80s before drilling to ensure that the small drilling machinery is drilled, electrically measured, and the casing is smooth. Quartz sandstone is a very hard rock. During the drilling process, the footage is often slow. When a meter is used, a two-meter sand may appear. The drill has a strong beating, more slag and rock cutting, and a drilling accident. Therefore, small-scale drilling machine operators are required to have a detailed understanding of this terrain. Clear water does not have the same lubricity as mud. When it encounters hard rock drills, it will be more powerful. The rock will be shattered when the drill is beating. The sorting of clear water is larger, and the larger the rock is. Can not be taken out of the hole by the rinsing liquid, the sand-like rock cutting is floating in the hole and always in the hole. If the powder feeding tube is used, there may be a phenomenon that two meters of sand may appear in a meter. If slightly Inadvertently, the drill may be buried, and the sand will bring more trouble to the clear hole. Quartz sandstone is formed by sedimentation and belongs to extremely hard rock. The holes drilled in the drilling process of small drilling machine are relatively shallow (30-200 m), so they are generally made of water using diamond drill bits. Drilling of the slurry often occurs: the footage is slow, and two meters of sand may appear in a meter of footage. The drill has a strong beating, more slag and rock cutting, and a drilling accident. Solution: If drilling with mud is not economical, there is only another way to find ways to reduce the beating of small drilling machines to reduce the generation of sand. You can add nitro acid and alkali adjuvants to clear water. The function of vibration lubrication, so that the drilling tool can be beaten and the sand is generated, so as to keep the hole clean and finally solve the problem! When the basalt strata are prone to micro-crack development and fragmentation during well drilling, it is prone to run-out and should be prepared in accordance with the leaky formation.

    2018 11/09

  • Must strive to reduce equipment damage and accidents caused by vibration
    The causes of equipment vibration are described in "Basic Conditions for the Main Body of the Rock Rotary Drilling Rig". The vibration hazards are as follows: 1 The structure of the equipment accelerates under the action of vibration, and the structure has premature fatigue failure. 2 Because of the uncertainty of the vibration direction, the structure of the rig is more complicated to load, and excessive triaxial force is formed inside the structure, and the equipment is more easily destroyed. 3 Due to the excitation, superposition and depletion of vibration, many structures change from static load to dynamic load, and most of them are impact loads, which puts higher requirements on equipment. 4 Accelerate the development and growth of tissue defects, such as the weld microcracks and the transition layer of the soft zone of the hardened zone in the heat affected zone, the internal defects of the material, the micro defects of the heat treatment, etc., which will absorb energy from the vibration to develop and grow. In order to reduce equipment damage and accidents caused by vibration, we should design and grow the rock drilling rig according to the following points: 1 Calculate the structural reliability from the angle of dynamic load and fatigue. 2 Strictly select materials, select suitable processing technology and strictly implement them. 3 Reduce the application of structures that are prone to failure in vibration (eg, screwing). Suggestions on the construction of rock drilling rigs 1. The effective service life of the tool is the most important factor affecting the drilling efficiency and economy. The qualified pick (or tooth) must be selected. 2. It is necessary to select a drill pipe and several drill bits that are well matched with the project. 3. Different geological methods should be adopted to drill geology with different lithology. 4. Control the depth of each drilling, master the method and timing of cleaning, and the cooling of the tool. 5. The drilling efficiency of the rock formation is 1/20~1/5 of the soil layer, and the equipment and tool loss is much larger than the soil layer. It is necessary to select the project with reasonable construction cost.

    2018 11/05

  • Drill bits must be paid attention to in rock drilling operations
    Among the mechanical properties of rock, the compressive capacity is the strongest, and the tensile, shearing and bending resistance is much worse. However, the underground drilling machine is difficult to directly stretch and shear the rock directly due to the limitation of the working space. bending. This requires the use of a drill bit to convert the pressure and torque provided by the equipment into tensile, shearing, and bending of the rock. In order for the drill bit to be effectively drilled into the rock formation, the problem should be solved in the following five aspects. 1. Drill structure and cloth teeth: The bit structure and the cloth teeth determine the free surface of the shape, the size of the free surface, and the free surface. As can be seen from Figure 4, Figure 5 and Figure 6 below, the drill in the early stage provides a free surface for later drilling. The drill bit that was drilled in advance created the free surface of the rock mass for the next drill bit. After the rock mass is stressed, the unconstrained free surface provides space for the operation of small rock blocks. From Figure 4, the pressure on the tool has been transformed into shear force, tensile force or bending moment, and the rock mass is under the action of these forces. Peel off from the large rock mass. The alternate operation of two or more drill bits can provide free faces to each other (Fig. 6), which greatly improves the drilling efficiency, thereby improving the rock breaking ability and reducing the excessive power demand for the host. For the incoming rock, the different rock formation properties should be matched with the drill bit. The structure of the drill bit, the shape of the cutter on the drill bit (chops, teeth, etc.) and the arrangement (dense, spatial angle) should be based on the strength of the rock mass. The degree of development of the joints, the inclination angle of the joints, the void ratio, the structural spacing, the cohesive force of the shear strength of the rock mass and the friction angle are set in a targeted manner, and the universal working bit does not exist. 2. The movement of cuttings: The cuttings have a hindrance to the drilling of the drill bit in the hole, the resistance of the cuttings is small, and the equipment capacity is used for effective work. With a drill bit, a rock-in-tube drill, a slag bucket and other drill bits to match the drill hole, the principle of screw conveyor is generally used to convey and guide the movement and discharge of the slag chip. It is less labor-intensive to drill the bit with smooth flow of slag. 3, the failure form of the tooth: the tooth is a tool directly acting on the rock. There are four main failure modes in use: First, the friction heat is too large, and the contact surface between the tooth and the rock layer is softened (or even melted) layer by layer. The pressure and friction flow; secondly, the wear resistance is poor; thirdly, the drill teeth working on one drill bit are less and overloaded; and the impact load is excessively broken. Others are hard alloys, hard alloys and unqualified welds. The pick-up of overheating and softening is a poor thermal strength of the carcass material; a large furrow appears on the carcass, indicating that the hardness of the carcass is much lower than the hardness of the abrasive; the visible furrow appears in the hard alloy, which is too soft for the hard alloy; The reason for the loss of cemented carbide is that the brazing quality is poor; a few teeth overloading operations are irregular teeth of the drill bit. At present, the biggest cause of tooth failure is that the tooth quality is too poor. Firstly, the pick-up produced by professional manufacturers has a low market share. Non-professional manufacturers basically do not understand what performance of the teeth can meet the requirements of use; secondly, the user buys the teeth when the figure is cheap. , regardless of cost performance. 4, the use of several types of drills: the purpose of the combination of several drills is to provide a free surface that facilitates rock fragmentation. After the rock is broken, the broken rock is taken out. This involves two problems. First, the structural interaction of the drill bit provides the possibility of facilitating the free surface of the rock. Second, the drilling depth of each drill is mastered. The most commonly used drill bit matching mode for rotary drilling bit into rock is suitable for hard rock (15≤Ra≤200MPa): cone spiral drill bit + rock-socketed drill + hard rock sand bucket + other tools (such as large stone fishing bit ) and suitable for soft rock (5 ≤ Ra ≤ 20MPa) mode: flat-headed spiral drill bit + hard rock sand bucket. There are also rotary drilling rigs with reverse circulation method and rotary drilling rig with large-diameter pneumatic down-the-hole hammer method, but these two methods can not reflect the advantages of rotary drilling rig, not much to explain here. 5, how to fish large blocks: the use of drill pipe with a drill bit to directly remove the large stones falling off the hole is the most effective way to obtain large rocks in the rotary digging method. The operator should perceive that the large rock has fallen off from the rock mass. After the large rock falls off the rock mass, it is judged whether the crushed slag or the whole is salvaged according to the characteristics of the rock. There is currently no shortage of large rock tools from the hole in the market. However, it is necessary to solve the problem of drilling large rocks in deep holes, and large rocks cannot be drilled and cannot continue.

    2018 10/30

  • Rotary digging into the rock is achieved by impact
    From the way of rock force in the rock drilling, all kinds of drilling rigs strive to achieve the impact on the rock, because the impact of the device makes the output force far exceed the static output. For example, the down-the-hole hammer directly impacts the rock through the impactor; the reverse-circulating drilling of the intermediate roller hob, the wedge-shaped hob, etc. is achieved by the different rotation radius of each point on the hob to realize the impact on the rock during the rotation process. Rotary drilling rigs enter the rock by controlling the weight of the drill to achieve rock impact. The drilling pressure is continuously cycled, supercharged, and decompressed in three modes in the mode shown in Figure 2. When the pressure is increased, the rotational resistance of the drill bit increases and decelerates. When the pressure is reduced, the resistance of the drill bit decreases and accelerates. From the equation of momentum and impulse conversion, the change of velocity is greater, and the shorter the change time is, the greater the impact force on the rock. Through the impact, the rig's insufficient force on the rock is effectively solved, and it is difficult to exceed the minimum load value of the broken rock. The impact on the rock also facilitates the formation of free faces. During the continuous rotation of the drill bit, the cutter head intermittently impacts the rock, and as a result, irregularities are continuously formed in the running direction of the cutter, and the old projection is broken to form a new projection. These rugged surfaces are the free faces of the drill. Whether the large free surface or the small free surface is beneficial to the rock under load (especially the impact load), the deformation is peeled off from the whole rock mass to form cuttings, thus increasing the drilling. effectiveness. The large pressurization capacity of the rig and the large power head power are the equipment conditions for realizing the rock into the rock. The ability to convert the equipment capacity into an effective rock breaking capacity must be properly coordinated by the pulse pressurization operation mode. From Figure 2, the reasonable pressure mode of rock drilling, the rock-injection mode of the rotary drilling rig is combined with dynamic and static loads, and the static load can increase the peak force of the impact dynamic load. The static load can also press the drill teeth on the rock at the bottom of the hole, so that the dynamic load is directly transmitted to the rock, reducing the power transmission loss and the power loss of the elastic collision. Dynamic loading is beneficial to make the applied load on the rock exceed a threshold.

    2018 10/24

  • Effective transfer of rock drilling capacity and pressure mode of rotary drilling rig and basic requirements for drill pipe
    When the rotary drilling rig enters the rock drilling, the torque and pressure of the equipment and the pressure mode are transmitted on the rock through the drill pipe. The drill pipe plays a vital role in the host capacity and the transmission of the rock. . In order to achieve the impact on the rock, the operator must control the pressurizing device to pressurize, decompress, and float the drill pipe to cause the rock to be impacted. If this pulsed pressing force is absorbed by the elastic deformation of the structure during the transfer, the rock will not be effectively impacted. In this test, it is a single-section drill pipe, which is beneficial to transmit the controllable drilling pressure. Figure 2 is a reasonable rock-injection pressure mode. The pressure may be attenuated by the transmission of the multi-layer rod in the large and small cycles, and the multi-layer drill pipe is transmitted. The pressure mode problem needs to be considered. The less the number of drill pipe layers is, the better the impact of the drilling machine on the rock impact. When the multi-layer drill pipe is not fully extended, the rigidity of the drill pipe buffer spring is more favorable for the transmission of the pulse drilling pressure. Excessive drilling pressure at the peak of the pulse drilling pressure may cause local instability of the drill pipe or fatigue fracture due to repeated partial compression of the radial alternating load due to instability. Therefore, the drill pipe body should be thickened to enhance the radial deformation resistance; the material elasticity should be increased to enhance the fatigue resistance under alternating load.

    2018 10/20

  • Basic conditions for the main body of the rock drilling rig
    The energy dissipation law and dynamic fracture criterion in rock clearly indicate: "When the loading energy is less than a certain threshold value, its loading energy does not participate in crack propagation at all, all of which is useless dissipative energy; when the loading energy reaches the dynamic fracture criterion, the rock Dynamic destruction, no power dissipation energy is about 15%." Based on this theory, the rock drilling rig must have large pressure capacity and large power head power (high torque and high speed). First of all, rock rock can achieve the penetration and crack formation of rock joint under the action of large pressure. The cohesive force disappears and can be separated from the rock body only by overcoming the friction force. The small rock mass can be squeezed to freedom under the pressure. The crack propagates to the free surface, and the small rock mass is sheared off from the rock mass. It is also possible to form a complete rock with an RQD greater than 75 to form cuttings under rolling. Drilling can only be achieved if the complete rock is turned into pieces and debris. Secondly, the high torque and high speed hydraulic power head is a necessary condition for impact work. On the bit cutting track of the drill bit, the pick impacts the raised rock mass, the power head is decelerated, and when the pick is over the raised rock mass, the speed is accelerated to the new protruding rock mass, and the rock is converted in high speed and low speed. The body is constantly being impacted. The greater the speed difference between high speed and low speed, the greater the impact of the protruding rock mass. Only the high torque and high speed hydraulic power head can increase the speed difference between high speed and low speed. For rotary drilling rig (power In the case of small rock-breaking machinery, the impact energy can effectively create some large loads to cross the [threshold value" of brittle fracture or plastic yielding of the rock. The rotary drilling rig must enter the rock to achieve the impact process. From the perspective of rock drilling conditions, it is necessary to improve the vibration resistance of the equipment itself. The source of vibration in the rock entering operation is the interaction between the drill bit and the rock, the bending deformation of the drill pipe, the eccentricity of the drill bit, and the uneven distribution of the quality of the drill. The drilling pressure is continuously cycled in the boost, decompression, and floating modes. This cycle is controlled by the operator and has a frequency of approximately 0.10 to 0.3 Hz, which is one of the sources of rock into the rock. Secondly, in the rock operation, one or several drill teeth continuously hit the raised rock to form an irregular "brake" phenomenon. The higher the speed of the drill, the more uneven the rock, the higher the frequency of the "brake", and sometimes the vibration The frequency is high, and the vibration, excitation, and exhaustion regularity of the vibration is also poor. From the above sources of vibration, it is impossible to offset the damage caused by forced vibration by active vibration, and the vibration resistance of the equipment itself must be improved. From the "threshold value" of brittle fracture or plastic yield of rock, it is required to apply sufficient force to the rock. This requires that the rock drilling rig must have sufficient weight to achieve the large pressurization capacity of the rig. In short, the large pressure, power head power and rig must have sufficient self-weight, which is the most basic requirement for the rock-in-drilling rig equipment itself.

    2018 10/15

  • Drilling pressure problem in well drilling
    In the well drilling work, the drilling pressure problem will inevitably be encountered, which directly affects the drilling speed and the damage form of the drill bit, and also affects the progress of the whole project. Under normal circumstances, as the drilling depth of the small drilling machinery increases, the drilling The pressure will inevitably increase accordingly. As the drilling pressure increases, the drilling speed of small drilling machines will continue to increase, and the bearings and cutting teeth of the drill bit will accelerate the wear. This paper introduces the work in the small drilling machinery. Different impacts of drilling pressure on drilling in different construction stages. There are three different stages in the relationship between the weight-on-bit and the drilling speed of a small drilling machine. Volume crushing stage: When the drilling pressure is increased above the rock pressing hardness, the cutting teeth are cut into the rock to produce volumetric breakage, and the drilling effect can be obvious, which is normal drilling. Therefore, the weight of the bite applied to the roller bit must be such that the cutting teeth can be pressed into the rock to cause the rock to break. Fatigue fracture stage: When the drilling pressure is close to the rock pressing hardness, although the cutting teeth are not cut into the rock, many cracks are generated on the rock surface, and the volume is broken by the repeated action of the cutting teeth; Surface crushing stage: When the drilling pressure is less than the rock pressing hardness, the cutting teeth can not cut into the rock, and the rock can only be broken in the friction form on the rock surface, which has a large wear on the cutting teeth, although the drilling speed of the small drilling machine is also increased with the drilling pressure. Large and proportional increase, but the drilling speed of small drilling machines is very low. Drilling pressure is a necessary condition for rock breaking at the bottom of the well. The size of the drilling pressure determines the way and characteristics of rock breaking. During the drilling, the drill bit is affected by the axial pressure and the rotating force. The cutting teeth are worn, dull or damaged during the process of pressing in and cutting the rock. Affect the drilling speed. By increasing the boring pressure, the test cone bit drilled into different grades of rock. The results show that different rockes have different drilling rig speeds for increasing the drilling pressure. Among them, medium-hard rock layers (rock grades 6-7) have a higher rate of drilling speed, while softer (rock grades 4-5) and harder (rock grades 8-9) are relatively The growth is not big. When drilling into cohesive soft rock, it is easy to produce water blocking paste, and the drilling pressure should be selected to be smaller.

    2018 10/10

  • Construction and quality control of bored pile foundation
    The construction of the bored pile foundation adopts the erecting pontoon as the transportation passage for the construction equipment and materials. A steel pipe pile platform is installed as a temporary working platform at the pier position; a guide frame is installed on the working platform, and the steel lifting tube is vibrated by the floating floating crane, and the steel casing is flattened, the girders are erected, and the steel slab is installed. Forming a drilling platform. Drilling machinery is installed on the drilling platform, and the mud circulation system is installed to carry out the drilling operation; the PHP high-performance mud is used in the drilling, the specific gravity of the mud is strictly controlled, the quality of the hole is ensured, and the hole is cleaned by the changing method after the hole is formed. After clearing the hole, the crane will hoist the steel cage; the whole section of the steel cage is less than 15m prefabricated, and the section is more than 15m prefabricated, and the field welding is integrated into the whole. After the second clearing, the concrete pumping pipe is poured into the pile. During construction, the thickness of the sediment in the hole, the time of the hole, the perfusion speed of the underwater concrete and the continuity of the perfusion must be strictly controlled to ensure the quality of the pile. First, the drilling machine selection According to the comprehensive analysis of the main span geology, hydrology and other natural conditions, combined with the existing construction machinery equipment and construction experience, the main span of the bridge deep water group pile foundation is planned to adopt GPS-22 full hydraulic rotary positive and negative circulation rotary drilling rig Drilling construction. The drilling machine adopts hydraulic transmission, centralized liquid-electric composite operation, safe and reliable; it can adopt two kinds of drilling techniques: positive and negative circulation. The drilling speed is fast and adapts to various formations. The maximum drilling diameter is 2.0m and the maximum drilling depth is 100m. Meet the needs of the construction of the deep water foundation of the Shaying River Bridge. Second, the construction process 1, PHP high performance mud preparation The role of PHP high-performance mud is mainly to balance the underlying pressure, suspend, carry drilling slag, lubricate and cool the drill bit, form mud and increase the stability of the hole wall. The geological conditions at the main pier of Shaying River Bridge are mostly silt and fine sand, which are easy to collapse. In order to protect the stability of the retaining wall during drilling construction, non-dispersive, low solid phase and high viscosity PHP must be used in pile foundation construction. High performance mud. The selected PHP high performance mud index must meet the following requirements: 1) mud specific gravity: 1.15 to 1.35 for drilling, 1.05 to 1.1 for clearing; 2) viscosity 19 to 28s; 3) sand content ≤ 4%; The colloid rate is ≥96%; 5) the water loss rate is ≤20ml/30min; 6) the static shear force is 1~2.5Pa; 7) the pH value is 8~10. When preparing PH high-performance mud, the order of clay and chemical compounding is clay→dispersant→flocculant→tackifier, such as clay→caustic soda (NaOH)→PHP→CMC. When adding chemicals, first make a water agent, then mix well in a mud mixer and add slowly. Discharge treatment of mud: When drilling, the mud treated by the mud separator can be recycled and recycled. The hole is transported to the local environmental protection department by the car and disposed of properly to avoid polluting the environment. After the drilling is completed, the waste mud is transported to the designated location of the local environmental protection department by sealed vehicles. It is strictly forbidden to directly discharge drilling slag and waste mud into the beach and water bodies in the river. 2, drilling operations Check whether the rig is running normally before drilling, whether there is any deformation at the bottom of the rig, whether the cable tying rope of the fixed rig is loose, and whether the position of the casing meets the design requirements. When drilling, the speed of the footage is controlled according to the geological conditions, and the slow speed is started. After the normal drilling, the drilling speed is adjusted appropriately. The drilling bottom adopts the 80% relief drill that does not exceed the gravity of the drill (deducting the buoyancy). Into ensure that the hole is stable. When the gimbal moves to the lower end of the rig chute, the drill pipe needs to be replaced. Before each replacement of the drill pipe, the drilling is stopped and the drilling machine is idle; the mud continues to circulate for about 1 to 3 minutes, and the drill pipe can be stopped after the drill pipe is exhausted. After stopping the pump and stopping the pump, the balance frame is lifted, the joint on the drill pipe is stuck in the hole, the connecting bolt of the balance frame and the drill pipe is removed, the balance frame is raised to the upper part of the drill frame, and the drill pipe to be exchanged is lifted by the auxiliary winch. The lower end is connected to the original drill pipe, and the upper end is connected to the balance frame. The drill must be raised outside the hole when drilling the slag, extracting the bit, removing the soil, repairing the rig, or stopping the drill for other reasons. 3, the first clear hole After the completion of the inspection of the final hole, it is necessary to clear the hole in time. The main purpose of the hole clearing work is to ensure that the amount of mud in the mud, the relative density, and the deposited slag at the bottom of the bored pile can meet the corresponding technical indicators. The specification requires that it can better inject concrete. Sampling and clearing is a method commonly used for clearing pores. When the initial clearing is used, the changing method is usually used. After the depth of the drilling hole meets the requirements of the design, the hole depth, the hole diameter, and the inclination of the hole are inspected. After all the indicators meet the requirements, the drilling slag and the mud are extracted by using a centrifugal suction pump to avoid cockroaches. The bad phenomenon of the hole, in the process of slag discharge, must ensure that the water head in the hole is higher than the construction water level 2.0m. After clearing the hole, after inspection, the emptying work is completed. 4, steel cage processing, lifting and sound tube installation The steel cage is processed in the steel processing field. When the length of the steel cage is less than 15m, the whole section is prefabricated. When it exceeds 15m, it is prefabricated. Rebar removes oil and rust from the surface before use. The steel bars should be straight and free of local twists and turns. For the main rib length of the force less than 25mm, lap welding is used, the joint adopts double-sided weld, and the weld length is guaranteed to be within the allowable value range of 5d. For the main ribs with a diameter greater than 25 mm, an in-line threaded sleeve connection is used. The stirrups are spot-welded by spacer method, and welded one by one, and the welding is firm to ensure the displacement of the stirrups when the steel cage is lowered. The steel cages are produced in strict accordance with the design drawings, and the indicators meet the design and specification requirements. Arrange the person to check the binding and geometric dimensions of the steel skeleton. Use a cross bracing to properly reinforce the cage so that deformation does not occur during the lifting process. Use a crane to lift the steel cage into the hole and use lap welding to connect at the air gap, while keeping the upper and lower sections on one axis. The acoustic tube is connected by a threaded sleeve, which ensures the cleaning of the sleeve during construction and transportation. When connecting, the lubricant is applied to the sleeve to ensure smooth connection and water tightness. The steel frame is slowly lowered when it is lowered. Pay attention to prevent collision of the hole wall. If it is difficult to decentralize, check the geological conditions of the stratum, analyze the cause, and then remove the resistance. After the depth of the steel cage is lowered to meet the design requirements, in order to prevent the occurrence of the cage failure during the lowering process, the hanger is used to firmly connect the steel cage to the platform or the casing. In the process of installing the steel cage, it is necessary to do the centering work, and strictly control the thickness of the concrete protection layer to ensure that it meets the design requirements. 5, catheter installation The pipe is made of φ300mm seamless steel pipe, each section is 2.0m~5.0m long, and is equipped with 1~2 section length 0.5m~1.5m short pipe and threaded connection. Watertight, pressure-bearing and joint tensile tests are applied to the pipe before use to ensure that the pipe does not leak. After the catheter is installed, the bottom of the tube leaves a space of 250 mm to 400 mm from the bottom of the hole. 6, the second clear hole Although the first clearing work was completed, the sediment was also produced at the bottom of the hole during the placement of the conduit and the steel cage. Therefore, after the conduit and the steel cage were in place, it was necessary to use the conduit to complete the second time. Empty the work. The second method of emptying is to install an elbow and a skin cage on the top of the pipe, pump the mud into the pipe, and then replace the sinking along the pipe from the bottom of the hole. The criterion for the second clearing hole is to ensure that the depth of the hole meets the design requirements, the mud density at the bottom of the hole is controlled to be within a range of not more than 1.15, and then the pouring of the underwater concrete is started. 7. Perfusion of underwater concrete When installing the catheter, place it in the hole, straighten the axis, and place it smoothly to prevent the cage from colliding and colliding with the wall. A funnel and a storage hopper are arranged at the upper end of the duct, and the lower mouth is about 0.4 m from the bottom of the hole. Underwater concrete is used. A rubber ball water-repellent facility is installed at the bottom of the funnel, and the first batch of concrete is poured by the chopping method. After the start of the pouring, it must be continuously poured to prevent the phenomenon of stoppage in the middle. When the catheter is lifted, keep the position of the catheter centered and strictly control the depth of the catheter to ensure that the depth of the catheter is always greater than 1m. When the catheter is removed, the action must be followed, and the entire process time should be controlled within 15 minutes. The pile top perfusion elevation should be 0.5m higher than the design elevation. The steel casing for construction is pulled out after the end of the filling and before the concrete is initially set. Precautions for construction: During the process of pouring concrete, if a certain amount of air concrete is not satisfied in the pipeline, it must be poured slowly when pouring concrete to prevent the formation of high-pressure airbag due to the presence of air, and a pipe blocking accident occurs. The rig operator must wear insulated rubber shoes with a safety helmet. The length of the dismantling pipe during the pile-plowing process shall be determined by the position of the concrete surface in the hole. Before the disassembly, the distance between the concrete face and the casing shall be measured. The number of pipe sections to be removed shall be calculated under the condition of ensuring that the buried pipe is not less than 2 m. When the pipeline is insufficiently buried in the underwater concrete, the hidden danger of the pile foundation concrete construction is reduced. Third, summary In summary, there are many factors affecting the construction of the bored pile foundation. During the construction process, the construction personnel must take effective measures against the frequently occurring problems to minimize the occurrence of similar adverse conditions. At the same time, the construction process is strictly controlled to ensure the quality of the project.

    2018 10/05

  • Exposure safety knowledge
    Open pit blaster job operation requirement. (1) The blaster must carry out special training, learn the safety knowledge of the system, master the performance of the blasting equipment, and obtain the blasting certificate through the examination of the relevant business department. (2) When transporting explosive materials, it is forbidden to mix and transport explosives and detonators. (3) Strictly abide by the system of collection, storage, consumption and transportation of blasting materials. (4) Before the blasting, the guard post must be arrested, the police should be strengthened, and immediately ignited to the safe zone. (5) When processing the detonating cord, it must be cut with a knife, and it is forbidden to cut with pliers and other items. (6) When the mining area enlarges the gun, the stuffing must be sand, and it is not allowed to be filled with gravel. (7) Regardless of the magnifying cannon and the small cannon, it must be allowed to enter the blasting site after 5 minutes of cannoning. If there is a blind cannon, it is necessary to take safety measures in time. (8) The remaining blasting materials must be returned to the warehouse for processing, and it is not allowed to be stored in private. (9) All blasting material warehouses shall not be stored in excess, and shall not issue or use blasting materials with deteriorated or external damage. (10) Blasting materials shall not be privileged, and blasting materials shall not be stored at locations other than those specified. (11) Loss of blasting materials must be strictly traced. For blasting operations, the scope of the guard zone and the position of the guard post and other safety issues must be clearly defined. (12) The blind cannon (small gun) left after the blasting shall be handled by the on-site operation commander and the blasting organization. No other work is allowed until it is properly processed. Other precautions for blasting work (1) To use blasting equipment, it is necessary to hold valid documents, blasting equipment license sheets and prescribed transportation tools, and carefully check the varieties, quantities and specifications. (2) Handling and blasting equipment should be handled lightly, and it is strictly forbidden to throw, rub or hit. (3) Before the operation, carefully check whether the blasting equipment used is correct, whether the quantity is consistent with the design, and check the correct operation before proceeding. (4) Smoking and hot fire are strictly prohibited during loading and unloading, transportation of blasting equipment and operation danger zones. (5) Ironing is strictly prohibited during operation. (6) The blasting danger zone prohibits the entry of unrelated personnel and motor vehicles. (7) When multiple blasting operations are carried out, special personnel shall be assigned to conduct unified command. Each working point must be operated by two people above. (8) It is strictly forbidden to shorten or extend the length of the fuse. (9) Before the blasting, the evacuation route and the location of the cannon should be confirmed. When the ventilation in the stope is not smooth, it is forbidden to keep people in the stope.

    2018 09/30

  • Drilling artifact - how does the water hammer drill deep holes in exploration?
    Suitable construction conditions: 1. Easy access to adequate clean water supply at the site 2, non-full core drilling hole, water hammer drill fast drilling through the non-coring formation after the replacement of the core drilling tool to continue drilling and core. 3, the surface or complex formation with a water hammer drill for pipe drilling, casing. 4. Quickly drill holes with water hammer, judge the slag composition by drilling, and quickly find the underground area of interest in advance. The core drilling rig is equipped with a water hammer and does not require much investment. It can be used with standard core drilling rigs and most existing accessories (water rotary joints, rods, pumps, etc.) and is especially suitable for casing. For engineering construction, save time = improve efficiency = reduce costs = increase profits. It is true that people are most concerned about improving profits. Of course, there is no such thing as omnipotence in the world, and water hammer can't solve all engineering problems. The right one is the best! Water hammer drilling technology may give you a more efficient drilling construction solution than traditional equipment...

    2018 09/26

  • drilling machine,drilling rig,the coal
    The mine adopts the model of drilling machine : ZY-750 full hydraulic tunnel drilling rig , which is used for coreless drilling, with ∮75mm opening. In the drilling process in order to prevent the emergence of top drill, drill clip, and error injection holes through the coal layer, formulated measures. In order to prevent accidents caused by injury during the drilling process. 1. The driver and operator of the downhole drilling rig must undergo special training, obtain a certificate of conformity and hold a certificate. 2. Before construction, the construction personnel should organize the construction personnel to carefully study the technical measures and understand the construction purpose, methods and requirements. The construction should be carried out in strict accordance with the measures. Workers without learning measures are not allowed to enter the site. First, drilling machine drilling protection measures 1. First add a protective baffle or fence between the rig and the orifice. 2. Set the fence in front of the rig and the rig console 3, the rig body should be fixed firmly, the column should be connected to the safety 4. Ensure that the pressure is even when drilling, and adjust the drilling progress according to the situation inside the hole. 5. It is strictly forbidden to stand after the drilling rig Second, during the drilling process, there are safety measures for top drilling, clamping drilling and nozzle drilling. 1. Suspend drilling and timely evacuation 2, strengthen ventilation, until the gas is no longer sprayed out, the gas concentration is lower than the limit value before construction 3, personnel should avoid the front of the rig to prevent injury and injury 4. High pressure water injection into the hole to accelerate gas emission and reduce coal seam gas content and pressure 5. Strengthen the ventilation so that the discharged gas concentration is less than 1% before the drilling can be resumed. 6. Personnel evacuated to a safe room or safe place 7. Pull out the drill pipe to a part of the drill pipe and wait for the gas to be released before drilling. V. Prevention of misunderstanding of coal seam safety measures According to the geological conditions of the mine, the mine gas geological map must be prepared in time. The map should indicate the mining progress, the scope of protection, the conditions of coal seam occurrence, the geological structure, the location of the prominent points, the strength of the outburst, the basic parameters of gas, etc. Predict and develop the basis for prevention and control measures. When excavating the rock-collecting roadway at the top and bottom of the coal seam, it is necessary to periodically and difficultly geological data, and timely grasp the construction dynamics and changes in surrounding rock to prevent accidental penetration of the protruding coal seam. Sixth, rig transportation safety measures 1. Personnel responsible for the transportation of the rig must pass the training and pass the examination and be certified to work. 2. When transporting machinery and equipment, it must not be extra long, super wide, super high or overweight. When the machinery and equipment are packed and transported, the consumable parts such as the oil pipe and joints, hydraulic valves, gears, racks, and sliding guide rails should be tightly closed and not allowed to be dragged on the ground during transportation. When carrying the equipment, do not touch the operating handles, and do not bend hard. 4. During the transportation of the rig, during transportation. The transportation of the downhole equipment must be carried out in accordance with the transportation requirements of the inclined shaft equipment. 5. The rig is tied by the drilling rig. The drilling rig, the inclined shaft and the inclined lane are driven. The hook is responsible for the winch. The drilling rig installation and disassembly of the roadway construction unit should be coordinated and assisted. The operation area and the safety supervision department are not sure whether the equipment is bundled. Check to make sure it is correct. 6. The drilling rig construction personnel must obey the inspection and command of the on-site inspection personnel during the operation. The shackle is operated by three people. When the vehicle is lowered, the driver at the bottom yard does not call the bell. When the winch is transported, the driver should concentrate on driving and listening to the signal and without the rope. Strictly implement the "no pedestrians" system. Seven, equipment installation measures When manpowering heavy objects, the site must have a unified command, echo each other, and stand up to prevent injury or damage to equipment. 1. When using the chain hoist to lift heavy objects, first check the strength and stability of the cantilever beam. When lifting the heavy objects with the frame, you must set up a person to legging and legging. When pulling a small chain, it should be evenly applied. It should not be too fast and too fast. When lifting heavy objects needs to be suspended, the small chain should be tied on the big chain. When the chain hoist is hung on the roof of the roadway, it must be hung in the preset special. Do not hang on the anchor net or anchor on the anchor cable. 2. Equipment installation should follow the following procedures and requirements 1 Before installing the rig, remove the floating coal and vermiculite, level the bottom plate, set the ground beam, select the appropriate position to place the drilling rig and dig the temporary drainage ditch. 2 The center line of the drill spindle is aligned with the drilling position, and the drill frame is placed. The base between the base and the ground beam is bolted, fixed on the base wood, and the column is placed. 3 The vertical axis of the drilling machine and the cutting edge of the leading edge of the balance wheel must be on a center line. The vertical axis angle must be consistent with the drilling design. 3. Safety facilities required for downhole drilling sites 1 A dedicated telephone directly connected to the dispatching room should be set up near the drill site to ensure normal communication. 2 Before construction, dredge the digging wells and use drainage facilities. 4. Equipment must be dismantled and transported 1 The rig must be bundled and sturdy on the vehicle disc. It is not allowed to be super high or super long. Remove the screws and other components, to use a covered iron or wooden box installed. Parts that are easy to lose, are owned by the driller and must not be loaded. 2 When disassembling and transporting, the air holes and oil eyes of the equipment must be tightly sealed, and the connecting bolts, nuts, shaft seats, pins, etc. should be replaced. When loading and unloading equipment, use special tools. It is strictly forbidden to hit directly with a hammer. 3 When the manual handling equipment is used underground, the equipment should be fastened with ropes, and it should be lightly lifted and lifted. It must be unified by special personnel, and the movements should be consistent. Eight, drilling machine operation measures 1. Before the drilling machine starts, it is necessary for the ground testing personnel of the production department to check whether the orientation and inclination of the vertical shaft meet the design requirements. The construction inspector checks whether the installation of each part of the drilling rig is stable and conducts trial operation. 2. The following inspections should be carried out before the drilling machine is drilled. 1 The operating system has a complete set of handles, buttons and meters, flexible and reliable. 2 The oil quantity of the hydraulic system and the seal of each oil pipe joint control valve are intact, and the oil pressure system should adjust the zero guide position. 3 Whether the brake device, friction clutch and locking device are normal, if necessary, adjust, the pump rotation is normal, the displacement and pressure should meet the requirements. 4 During the drilling process, it is necessary to observe the color of the water flowing out of the borehole at all times, thereby judging the composition of the drilled coal seam, and timely reporting to the dispatching room and the geodetic surveying department to assist in the treatment. 5 Strictly check the quality of equipment, underground cables and equipment are strictly prohibited from detonation. Nine, drilling construction safety technical measures (1) Safety technical measures for drilling construction 1. The downhole rig driver and the driller electrician must undergo special training, obtain a certificate of conformity and hold a certificate. 2. Before construction, the construction personnel should be organized to carefully study the technical measures and understand the construction purpose, methods and requirements. The construction should be carried out in strict accordance with the measures. Workers without learning measures are not allowed to enter the construction site. 3. Personnel participating in the construction must abide by the instructions for going down the well, familiar with disaster prevention measures and underground disaster avoidance routes. 4. Before the construction of the underground coal seam, the objectives, tasks, construction methods and quality requirements of the project design must be carefully understood. 5. Drilling personnel should wear neatly and neatly, and the placket, cuffs and trousers must be tight. 6, the fuselage is placed smoothly, tighten the bottom screw. All kinds of electrical equipment must be explosion-proof, and the protective part and protective cover should be installed in the mechanical rotating part. 7. Check the vertical shaft before drilling, and prepare all kinds of materials, accessories and spare tools, and arrange them neatly and orderly. 8. Normal drilling should maintain uniform pressure and adjust according to the situation in the hole. 9. When drilling with clean water, it is necessary to ensure that there is enough water, and it is not allowed to dry the drill. In order to prevent the buried drill, the pump must be pumped first. After returning to the water, it can be drilled. 10. Record all kinds of data in a timely, accurate and comprehensive manner, and fill in the original construction report. 11. In accordance with the design and construction during construction, there are abnormal situations reported in time. 12. Drilling shall be strictly in accordance with the drilling design drawings of the general working area to ensure the quality of drilling construction. 13. The actual measurement of the borehole, strictly according to the azimuth and slope of the roadway, the on-site technicians fill in the construction progress and the coal seam layer horizon map, and the geodetic survey section accurately fills in the control map of the tunneling control point. 14. The drilling construction personnel must follow the instructions of the geotechnical personnel on duty to accurately control the position of the coal seam. During the drilling process, the drilling must be stopped when the coal point is seen. After the geological personnel make a record, they can continue to drill and must obtain the geological personnel. After agreeing, you can withdraw the drill. 15. According to the drilling data collected on site, the geological personnel sorted out and plotted the actual results of the drilling. 16. During the construction process, the probe on the head must be hung in the upper position of the front of the rig; the wind and gas lock must be complete and effective. 17. When installing and disassembling the drill pipe, pay attention to personal safety. It is strictly forbidden to stand after the drill to prevent the top drill from injuring people. 18. After the drilling is completed, the hole should be sealed in time. 19, the striking tool should drill field using copper products, to prevent spark, ignite the gas. 20. A protective baffle or baffle should be installed between the rig and the orifice and before the rig operating platform to protect the drill from being damaged by prominent coal and rock. 21. When changing the hole or withdrawing the drill, the gas in the borehole must be completely released before the drill pipe can be pulled out to prevent the gas in the hole from being ejected or causing the coal rock to cause injury. 22. Other unfinished matters shall be strictly implemented in accordance with the relevant provisions of the [Safety Regulations for Coal Mines" and [Operational Regulations for Coal Mine Safety Technology". (II) Technical measures for prevention of gas safety 1. To strengthen the monitoring of gas in drilling, a full-time tile inspector should check the gas condition according to the time and report the change in time. 2. Drilling team management personnel, team leader, must carry portable methane alarm device, and continuously test the methane in the construction scope. If there is an alarm phenomenon (methane alarm point is 1%), it must be reported and processed in time. 3. The position of drilling holes should be observed first to see if there are any safety hazards. Whether the roof support is intact or not, there are hidden dangers that must be dealt with first to ensure that there are no safety hazards before construction. 4. The construction site must be guarded by gas inspectors and safety supervisors, otherwise construction is strictly prohibited. 5. The drilling site must be well ventilated, the air duct must follow the working surface, and the local ventilator must be managed by a special person to prevent unplanned power outages and winds. 6. When drilling the drill, it is necessary to concentrate on the idea, while drilling and observing the change in the hole, it is found that the abnormality is stopped in time. 7. When the harmful gas in the borehole is ejected, the gas is sharply increased, and the drill pipe is drilled, the drill should be stopped immediately to strengthen the ventilation. In accordance with the regulations, measures should be taken in time to report to the relevant departments of the mine. 8. When drilling the hole into the design position, the gas content in the hole must be checked to ensure that there is no overflow before the drill pipe can be pulled out. 9. When the gas concentration in the roadway wind reaches 1%, the operation must be stopped. When the gas concentration in the roadway near the drill field is 1.5%, the operation must be stopped, the personnel should be evacuated, the power supply should be cut off and processed, and the wind power flow within 20 meters near the electromechanical switch. When the gas concentration reaches 1.5%, it must be stopped, the personnel removed, the power supply cut off and processed. 10. When one of the following situations is encountered during drilling, the operation must be stopped immediately, the personnel must be withdrawn, and the headquarters should be returned and listened to. (1) The gas concentration increases or decreases; (2) Spraying water, coal or gas inside and outside the borehole; (3), the drilling pressure is increased, and the top drill and the stuck drill appear; (4) There are coal cannon sounds and rock break sounds. (5) When the ambient gas concentration exceeds 1%.

    2018 09/21

  • Hengwang opens the road of intelligent road roller
    With the development of science and technology, "intelligence" has indiscriminately penetrated into all aspects of modern life, and the seemingly cumbersome and extensive construction machinery has also embarked on the road of intelligence. As far as the construction machinery industry is concerned, [intelligence" is the application of modern communication and information technology, computer network technology, industry technology, intelligent control technology, etc. on engineering machinery equipment, so that products are more in work and production. Adopt intelligent methods to reduce the workload of personnel and improve work efficiency. After nearly a decade of development, China's construction machinery industry has achieved remarkable results. Now it has developed into the world's largest producer and seller, but the overall situation is still large but not strong. The intelligent level of product intelligence and production process is still relatively high. At a low level, facing the highly competitive construction machinery market, the road to intelligentization in China's construction machinery industry is imminent. Hengwang(Shandong) Construction Machinery Co., Ltd., which is known as the "cradle of China's compaction machinery", has been shouldering the mission of "leading the development of China's compaction machinery industry" for more than 100 years, and launched the first in China at the end of 2013. Intelligent double drum vibratory roller [product features and advantages] First, energy saving and environmental protection 1. It can realize constant speed control and power self-adaptation, and provide power according to different conditions and requirements of static rolling and vibration grinding. 2. Cooling system fan temperature control start function two patent designs. 3. It can realize automatic stoppage of engine idle running for more than 10 minutes. 4. Sprinkler system dual-pipe design, anti-drip inlet nozzle, realize the stepless adjustment of the water quantity of the sprinkler system, control the unreasonable consumption of water volume; intermittent spraying can be steplessly adjustable, and the water tank can be extended twice according to the need. Take into account the improvement of the working time of the whole machine and the amount of water sprayed and the effect. 5. The simple design of the double wire scraping board can realize the wheel plate detachment when necessary and reduce the engine power consumption. Excellent functional design Second, the operation is simple, the compaction effect is better 1. The walking system realizes the soft impact function, and the flexible starting parking weakens the picking up of the micro-corrugation of the compacted material, minimizes the impact crack damage and compacts the material, and ensures the compactness of the compaction. 2. Integrate the programmable controller with microelectronic technology to realize the fixed speed cruise function at the specific frequency of the roller. 3. Automatically start the automatic watering function to realize the automatic control and manual customization of the three systems of vibration, watering and walking. 4. Patented anti-drop function design of trimming and crimping, watering and front and rear wheel sprinkling interlocking function. 5. Multi-function walking electric control handle simplifies the interactive operation of walking, starting and sprinkling. 6. Improve the uniformity of pavement compaction by adjusting and optimizing the position of the eccentric block in the steel wheel; the vibration unit damping fluid design reduces the impact of parts and reduces the compaction disturbance of the compacted material. 7. Ultra-high frequency vibration design, greatly improve the efficiency of compaction operation, high frequency up to 67Hz, 30% higher than traditional roller machine. 8. The combination of walking and vibrating mechanism is different to improve the bias drive design of the traditional model, like the rowing of the rowing boat, reducing the deflection tendency of the whole machine, ensuring the uniformity of the left and right driving of the whole machine, and the uniformity of the compacted material. Force. The front and rear wheel vibrations rotate in the opposite direction, and the single vibration applying direction of the vibrating wheel is improved at the same frequency, and the road surface compaction quality is improved by the simultaneous two-way equalizing force application. Third, high reliability, easy maintenance 1. The key components adopt imported or market-proven mature technology products to ensure the reliable use of the whole machine. 2. It can realize traceability query of fault code and fault cause, accumulate and perfect database, facilitate the logical judgment of maintenance and repair of the whole machine, fully guarantee the timeliness maintenance of the whole machine and shorten the troubleshooting time. 3. Sprinkler system water pump, valve, water filter and other components can achieve ground maintenance. 4. Four-link patent structure, fully open hood, pump, valve, engine, three filters, oil, hydraulic oil, fuel oil, water, antifreeze and other maintenance at your fingertips. 5Vibration wheel is added with oil and gas pipe, reducer and oil release, easy maintenance. 6. The simple design of the double wire scraping board can realize the fixing of the scraping board at any position, which can reduce the unnecessary material wear of the scraping board, and the adjustment is convenient and reliable. 7. The drive disc shock absorber can be separately disassembled, the chute structure can be eliminated, and the bolt pre-tightening performance can be enhanced. 8. Maintenance time reminder appointment function, strengthen the pre-maintenance timeliness of the whole machine and improve product reliability. 9. The extensive use of imported joint hoses greatly improves the reliability of the whole machine. 10. The automatic power-off and automatic power-off of the shutdown are double-set, to prevent the unreasonable loss of the imported battery, and to extend the stop time of the whole machine. Fourth, the comfort is strong 1. Man-machine interface fault alarm and interactive operation, electronic control knob throttle, feel level control. 2. The operating table rotates 180 degrees to improve the blanking field of view. The soft-axis operation is simple and reliable. The color display can be adjusted according to the outdoor light inlet. 3. The cab is pleasing to the eye and the best sealed cab. While blocking the outdoor noise, the winter and summer use the configured air conditioning and mp3 music to reduce driver fatigue. 4. Excellent ventilation performance, rain-proof leakage design for overhead sunroof, humanized setting of tool box and cup holder, adjustable seat dimensions and adjustable steering wheel angle. The details are full of humanized design Fourth, strong comfort 1. Man-machine interface fault alarm and interactive operation, electronic control knob throttle, feel level control. 2. The operating table rotates 180 degrees to improve the blanking field of view. The soft-axis operation is simple and reliable. The color display can be adjusted according to the outdoor light inlet. 3. The cab is pleasing to the eye and the best sealed cab. While blocking the outdoor noise, the winter and summer use the configured air conditioning and mp3 music to reduce driver fatigue. 4. Excellent ventilation performance, rain-proof leakage design for overhead sunroof, humanized setting of tool box and cup holder, adjustable seat dimensions and adjustable steering wheel angle. This product uses a computer PLC and CAN bus technology realize intelligent control of core functions such as walking, compaction, watering, fault diagnosis and maintenance of equipment, which indicates that China has embarked on the road of intelligentization in the field of compaction machinery. The construction machinery industry is a strategic industry that provides technical equipment for national infrastructure construction. It is also the most important sub-sector in the equipment manufacturing industry. It is one of the key areas encouraged by the state. The development of its manufacturing technology can fully drive the equipment manufacturing industry. Upgrades and technological advances are the concentrated expression of the country's comprehensive strength. At the same time, construction machinery faces the market economy and participates in global competition. Advanced manufacturing technology has become the core competitiveness of enterprises. It can be seen that intelligence will become the mainstream trend of the development of engineering machinery in the future.

    2018 09/12

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