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Shangqiu Yucheng Anchor Pulling Force Calculation Industry Development Opportunity and Direction

发布时间: 2019-12-29 17:36:01 发布人: 王超 字体大小: 【大】 【中】 【小】 Article source: hpsdrrjsg Release time: 2019-12-29 17:36:01 Posted by: Wang Chao Font size: [Big] [Medium] [Small]

<p> Shangqiu Yucheng's bolt pull-out force calculation industry development opportunity and direction net can not only effectively deform the surrounding rock in the tunnel, but also have a good supporting effect on the deep surrounding rock. In the presence of a net, although the surrounding rock on the surface of the roadway is not loose, it can be used as a force transfer medium, so that the surrounding rock in the deep part of the roadway is still under stress, which improves the residual strength of the rock mass and significantly reduces the surrounding rock mass. The range of loose and broken rocks also guarantees the anchoring effect of the bolt. Laboratory test data show that when the test piece reinforced with anchor nets is cracked into dense thin columnar rod systems under load, the residue is more complete, and the residual strength is about 1/4 of the ultimate compressive strength; there is no net anchor The rod-reinforced test piece was incomplete, and the pulling force of the anchor in Shangqiu Yucheng was generally without obvious residual strength. If there is no metal mesh or metal mesh failure, the surrounding rock will develop from the surface to the deep part, gradually broken, loose, and lose its strength, resulting in the collapse of the surrounding rock and the failure of the anchor rod. The theory of supporting the loose circle of Shangqiu Yucheng Loose Zone was proposed by Professor Dong Fangting of the University of Mining and Technology after in-depth research on the state of surrounding rocks. The study found that the existence of loose rocks in surrounding rocks is an inherent characteristic of surrounding rock caverns. Its range size (thickness value L) can be currently measured by means of a sonic meter or a multi-point displacement meter. The main object of surrounding rock support is the crushing deformation force generated during the development and development of the surrounding rock loosening zone. The tensile force of the anchor stems from the occurrence and development of the loosening ring. According to the thickness of the surrounding rock loose zone, it can be divided into small, medium and large categories. The diameter of high quality bolts should meet the following requirements: the diameter of cement mortar bolts should be larger than the bolt body 15 mm; the diameter of resin bolts and fast hardening cement wire rod bolts should be 42-50 mm, the diameter of small diameter bolts should be 28-32 mm; water expansion The bolt diameter should be 42-45 mm; the diameter of other bolts R should meet the design requirements. Inspection item Hengshui 4. The installation of fast-hardening cement plate bolts should meet the following requirements in addition to the provisions of Article 2 of this code; after the cement plate is immersed, the bolt body should be immediately sent to the bottom of the hole. Before the initial setting of the cement, the bolt body should be placed Stir in and stir. Quality department seriously equipment and wiring? Avoid leakage and hurt people. Shangqiu Yucheng Anchor Pulling Force Calculation Industry Development Opportunity and Direction Installation Before installing the anchor, the water and rock powder in the eye holes should be cleaned with compressed air. When purging, the operator should stand on the side of the orifice, and no one should be in the direction of the eye hole. First put the resin medicine roll into the eye mouth one by one according to the specified quantity and specifications, and use the anchor medicine roll to gently send it to the fundus. , Start the anchor machine to roll the medicine while advancing. Stirring time is 25-30s. After the stirring is complete, stop stirring for about 30s. When the resin roll solidifies, slowly lower the anchor machine, put on the tray, screw on the nut, and after 12 minutes, tighten the nut to apply a predetermined pre-tightening force to the anchor rod. Tighten the nuts to ensure that the pallet is compacted and the surrounding rock surface of the roadway, and the pullout resistance of the anchor rod is not less than 70KN. The return rate of high quality and low price 4 concrete should not be greater than 15% for side walls and 25% for arches. Good quality </ p> <p>

Shangqiu Yucheng Anchor Pulling Force Calculation Industry Development Opportunity and Direction


</ p> <p> Shangqiu Yucheng Anchor Bolt Pulling Strength Calculation Industry Development Opportunities and Directions Buttress retaining wall buttress retaining wall is a kind of reinforced concrete thin wall retaining wall. Its main features are simple structure, The construction is convenient, the cross section of the wall is small, and the weight is light. It can give full play to the strength properties of the material. The anchor support process of Shangqiu Yucheng can adapt to the foundation with low bearing capacity. Suitable for areas lacking stone and earthquakes. Generally used in higher fill sections to stabilize the embankment to reduce the amount of earth and rock works. c. During the operation, it must be operated by a certificate holder, and the surrounding guard work must be done to ensure the safety of pedestrians and vehicles in the past. Reinforcement length: According to the height of the surrounding rock suspended along the direction of the anchor rod, or the height of the surrounding rock load, it can also be determined by the thickness of the loosening ring measured by testing techniques such as acoustic waves. Rotary jet anchor RARR; After the drilling and installation of the rotary jet anchor, it has become an innovative point of the rotary jet anchor with initial anchoring force: it has the advantages of initial anchoring force and full-length anchoring force: it has the initial anchoring force, Applicable to various disadvantages of rock and soil: grouting procedures are time-consuming, the construction environment is poor, the rotation speed is affected by the rotating resin anchor RARR, and it is also installed in the borehole. When the rotating bolt uses the initial anchoring force to mix the resin cylinder into the innovative point of the rotating resin anchor, the advantages of applying the prestressed resin anchoring force immediately after the mixing end of the cylinder are the reliable anchoring force and wide adaptability. The installation of the anchor requires a special drilling tool self-drilling self-anchoring anchor RARR. Inserting the drill pipe into the hollow of the rotating anchor to complete the drilling installation for the second time is an innovative point of the self-drilling anchor with the initial anchoring force . The advantages of self-drilling initial anchorage anchors are: the initial anchoring force is fixed, the installation speed is fast, and any shortcomings of the rock and soil layer are required: special drilling tools, rotary jet anchors, RARR are required during installation, and the anchoring force innovation is achieved through weight-on-press and grouting 35kn / m. In the middle of the soil layer, the advantages of drilling and grouting soil anchors are: adapt to the shortcomings of loose rock soil layers, drilling and grouting cannot be used to explain the self-drilling and self-drilling Spinning and self-anchoring-any formation is suitable for grouting, grouting and rotation. Grouting—Effective screwing in any situation [ordinary bolts + self-drilling bolts + grouting bolts + special bolts-ordinary bolts & R]; Resin bolts-Resin bolts and resin bolts anchor reliably at the same time; construction speed is 30 %. Pre-stressed self-drilling anchor RARR; Self-drilling self-drilling anchor overcomes the shortcomings of traditional self-drilling anchors that only drill without anchoring, drilling anchors, and soft rock and soil do not grout for the second time; simplify the process; pass 50% grouting Bolt RARR improves efficiency; rotary jet grout grout G. The flow flowing from the spinning wire can ensure the filling degree between the spinning wires, and can enter the fractured rock mass, and the grouting and anchoring effect is reliable. 99% special bolts RARR; self-tapping and spinning bolts; rotating grouting bolts in soft rock and soil without drilling; direct spinning and anchoring; rotating grouting in loose bodies, installation reinforcement and anchoring time completed. Shangqiu Yucheng shotcrete support can improve the properties of rock and soil, strengthen the inherent strength and integrity of rock and soil, increase its self-supporting and self-stabilizing ability, and give full play to the potential of rock and soil. Work description 05 The function of the net is generally believed that the net can be used to maintain the surrounding rocks between the anchors and prevent loose small rocks from falling. In fact, the role of the net is far more than this, especially under the conditions of high geostress and broken surrounding rock, the net is an indispensable and important part of the anchor support system. The construction period is short, which can quickly and effectively restrain the deformation of the slope. The construction of shotcrete support is fast and convenient, so it can form an overall supporting structure in a short time, especially for some slope reinforcement and rescue projects. In the case that the construction time of the beam structure is too long to meet the needs of short-term reinforcement, the anchoring methods of the anchors in Shangqiu Yucheng are divided, and the short-term support effect of spray anchor support is very obvious. Influence of Hao Shangshangqiu Anchor Support on Surrounding Rock Structure. The essential role of the anchor on the discontinuous surface is: the axial and tangential forces of the anchor rod improve the shear strength of the discontinuity and prevent the discontinuity from moving. Improve the strength of the structural plane and the overall strength, integrity and stability of the jointed coal and rock mass. Shangqiu Yucheng Anchor Bolt Pulling Force Calculation Industry Development Opportunity and Direction Arrangement Principle: The direction of the anchor rod above the arch waist should be favorable for the tension of the anchor; the anchor below the arch waist and the side wall should be in the direction of the unstable rock block. Complete variety 8 Complete process system After the installation is completed, it is advisable to use earth or small stones to press the grille tiled on the ground when possible to avoid falling the rock and lifting the grille upward. In tunnel construction, anchor support is often used. The prepared pole is driven into the pre-drilled holes in the surface rock or around the rock chamber. The head, the special structure of the rod, and the tail support plate (also Not required), or relying on the bonding effect to combine the surrounding rock with the stable rock mass to produce a suspension effect, a composite beam effect, and supplementary fruit to achieve the purpose of support. It has the advantages of low cost, good support effect, easy operation, flexible use, and less construction clearance. The so-called anchor rod is a steel pipe welded with angle steel sheets to form barbs (driving into the soil anchor rod and grouting to strengthen the soil connection. The slope is reinforced with steel mesh and fine stone concrete retaining walls to ensure the stability of the soil in the foundation pit slope. Process, the end of the steel pipe has been flattened, before the construction of anchor bolts, safety measures are taken to clean the unstable soil and stones on the slope, and if necessary, to hang a safety protection net. Quality is too good </ p> <p>

Shangqiu Yucheng Anchor Pulling Force Calculation Industry Development Opportunity and Direction


</ p> <p> Shangqiu Yucheng Anchor Pulling Force Calculation Industry Development Opportunity and Direction 6 Self-drilling Hollow Grouting Anchor Self-drilling Hollow Grouting Anchor is a new type of anchor that will drill, anchor Pole installation, grouting, and anchoring have the characteristics of fast construction speed, large anchoring force, good performance, and simple process. The grouting process is to grout inward from the middle hole of the anchor immediately after drilling. After the slurry reaches the bottom of the hole, it is filled from the bottom to the orifice along the hole wall and the anchor wall, thus not only ensuring timely Supporting the stratum, at the same time, ensuring the fullness of grouting in the borehole, and filling the stratum gaps around the borehole wall, increasing the anchoring force. In addition, due to the tightening force of the nut at the anchor end of the hole, it can be designed as a prestressed anchor. The main role of discount anchors is to constrain and strengthen the soil. It can not only make up for the lack of tensile and shear resistance of the soil, but also during the grouting construction of the anchor, the cement slurry can penetrate into the cracks in the rock and soil. Reinforcing effect of grout on rock and soil, and improving the structural strength of rock and soil itself. The total cost of the grouting material is required to be prepared in strict accordance with the tested and qualified ratio. The grouting slurry should be stirred uniformly in accordance with the mixing ratio and used with mixing. Anchor hole grouting must be carried out at the bottom of the hole (the grouting pressure is generally about 0MPa) until fresh grout overflows at the orifice. It is strictly forbidden to pull out the grouting pipe or grouting; if it is found that the grouting surface of the orifice falls, it should be within 30min. The bottom of the hole is pressure-filled 2 to 3 times to ensure that the hole slurry is full. The working state of the pressure anchor is that the grout is compressed, the grout is not easy to crack, the anchor is corrosive and can be used for anchoring projects, and the compression performance of the grout is much better than its tensile performance. Its performance is better than that of tension-type anchors. In addition, due to the isolation measures taken between the anchor core and the grouting body, conditions are created for recycling the anchor core after the anchor is used. In general, the construction process of pressure anchors is more complicated than that of tension anchors, and the cost is relatively high. To a certain extent, its application and development have developed, but its corrosion performance is better, especially with the recyclable core, The feature that does not cause obstacles to the development of the surrounding space is the development and application direction of the support form of foundation pit engineering in the future. Length (mm): 1200, 1500, 1800, 2000, 2500 (can also be customized according to customer requirements); Material: 16Mn, 20MnSi; Pipe joint bolts are currently used less in coal mines. Good part of cement mortar: Generally use ordinary portland cement, the particle size of the sand is not greater than 3mm, and sieved; the strength of the mortar is not less than M20; the mixing ratio is generally cement: sand: water = 1: (1 ~: (0.45 ~ 0 .. The bonding mortar should be mixed uniformly, and its workability should be adjusted, and it can be used as soon as possible. It supports the surface of the roadway and improves the stress state of the surrounding rock. The steel belt supports the surface of the roadway and inhibits the delamination and cracks in shallow rock layers , To maintain the integrity of the surrounding rock, reduce the stretching of the rock formation, improve the stress state of the rock formation, and prevent the loose rock blocks from falling between the anchors. </ P>