1, support materials 6- ¢ ¢ 8 mm with steel mesh, a mesh opening of 150 × 150 mm, 200 mm hope they overlap, using # 12 wire lead firmly tied. The pipe joint anchor is made of steel plate with a thickness of 2-2.5 mm. The length is 1.8m, the outer diameter is mm43mm, and the plate is made of 5mm thick steel plate to form a “convex†type plate. Ordinary portland cement, ceramic spontaneous combustion, spontaneous combustion of coal gangue after the main add some additives, after autoignition ceramic formed using a particle size less than 5 mm in place of part of the sand, and the particle diameter is 5 10mm replaces the stone, so that the self-igniting ceramsite can completely replace the sand in the original concrete, and it is used in the underground roadway to support the jet concrete. The quick-setting agent produced by the building materials factory is matched as a shotcreting material according to the mixing ratio. 2, advanced support Before each start of excavation, the current support of the pipe joint anchor is used at the top of the working face, and a large row of anchors at the top of the working face is considered according to the angle of 35-400. The spacing between the bolts is 0.8m, forming an umbrella structure roof. The front control panel is not less than 1.5m, and the front support is not less than five. 3. Temporary support Temporary support with pipe joint anchors, we must insist on finding out the system, find out and float, and protect the apex column, and hit the anchor under the temporary support of the roof. Or use the first 50mm thick sealing slurry, and then pipe the anchor bolt, the pipe joint anchor spacing is 0.8m, and each row is not less than 10. 4, permanent support The maximum circulating distance of the anchor net spray support construction shall not exceed 1.2m, and it shall be carried out within the range of the leading roof cap dry. The top anchor bolt is used to hang the net in time, and the mesh is pressed with the pallet. The mesh edge is lapped 200mm, and the 12# lead wire is fastened, and the sprinkler is sprayed into the lane in time. Second, construction requirements 1. For safety reasons, the upper part can be pre-requisited, shallow-eye cannon can be used for construction, the circulation progress should not exceed 1.2m, and the surrounding eyes should be densely arranged, and the eye-opening method should be used to ensure the formation of the roadway. 2, wind or handcuffs brush caps, loose rock with a wind brush brush cap, when the wind brush does not move, use a relaxing cannon. After the upper part is excavated, the anchor rod is hanged in time to protect the roof, and the shotcrete is used to construct the roadway. After the lower part of the lower part of the rock is removed, the lower part is dug, and after the meteorite is cleared, the two sets of bolts and the top of the roof are sprayed in time to make it into a lane. Make full use of the principle of adapting the plastic rock layer of the pipe joint anchor to make the roadway cofferdam tend to be stable, and to dig a cannon to protect the roof. 3. Using the bolt propeller of its own processing, the length of the rod body is 350mm and the two ends are made into the shank. The front of the large anchor rod is placed on the pipe anchor bolt plate, the plate is convex outward, and then the bolt eye is inserted. The top of the hammer is in a good position, then the thruster is inserted into the wind hammer card bushing, and the other end is first put on a circular baffle cut with a thickness of 20mm steel plate, inserted into the tail of the pipe anchor, and driven by the impact force of the wind hammer. The anchor rod is such that the anchor plate is in close contact with the rock. Third, the analysis of support effect By using the anchor net spray to support the four-return windshield gate 40m, compared with the u-shaped shed roadway, the overall deformation of the roadway is small, and the section shrinkage rate is reduced. Therefore, this support method better maintains the stability of the roadway. It can be seen from the above results that in the roadway passing through the coal seam, the effect of using the anchor net spray support ratio with the u-shaped shed support is good. Although the U-shaped shed bracket has good compression resistance and large bearing capacity, but due to the soft and broken rock, passing through the coal seam, the support is under pressure and the scattered pressure of the surrounding rock is always rising, which is difficult to stabilize. Because the deformation of the bracket can not adapt to the deformation of the surrounding rock, and the support can not close the surrounding rock to prevent the weathering of the surface rock, it is difficult to maintain the stability of the roadway, and the advantages of the anchor net spray support and various supports The loose surrounding rock can be combined into a whole, which improves the physical and mechanical properties of the surrounding rock, thereby forming a reliable and effective combined arch structure, improving the bearing capacity and stability of the support, and reducing the concentration of the bottom drum stress. Effectively control the deformation of the roadway.
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First, support materials and requirements