Roof protection method for mine underground blasting

Abstract

A roof protection method for mine underground blasting relates to the technical field of mine mining, and is characterized in that a plurality of clamping pieces (4) are arranged on the outer edge surface of a hollow steel pipe (2), clamping tips of the clamping pieces are clamped on the inner wall of a protection hole after the hollow steel pipe is plugged into the protection hole, and then filling materials (3) are filled; the other space of the protection hole is completely filled with the filling material, so that it is guaranteed that the card is firmly clamped on the inner wall of the protection hole, the net falling phenomenon is effectively avoided, and the protective net has the advantages of being simple and convenient in structure, good in use effect and the like and is suitable for large-scale application and popularization.

Description

technical field [0001] The invention relates to the technical field of mine mining, in particular to a roof protection method for underground blasting in mines. Background technique [0002] It is known that the hardness of coal is between 1 and 4, while the hardness of common minerals in our country is between 4 and 8. In the process of mining, most of the coal is mined by the shearer, and after the relevant conversion according to the Rockwell hardness of the shearer's pick and the Mohs hardness of the ore, the hardness of the pick is more difficult for commonly used ores to mine. , The damage rate and replacement rate of the picks are relatively large according to the calculation, and they are not suitable for economic indicators. Therefore, the mining of common minerals has been using explosive blasting technology for operation. [0003] The process of explosive blasting and breaking the rock mass is an instantaneous dynamic process, which can generally be divided into ...

AI Technical Summary

Problems solved by technology

[0006] 1. Resin anchor: First, the operator needs a rock drill to drill the anchor hole. After the anchor hole is drilled, hang the anchoring agent package on the end of the anchor, and then use the anchor machine to drill into the hole until it is completely drilled to the end. Finally, hang the net, put on the pallet, and so on to complete the net hanging operation. The disadvantage of this process is that the anchoring agent cannot be completely integrated with the entire anchor rod, and most of it is at the bottom of the anchor rod, so that more than 80% of the anchor rod is If it cannot fit the rock wall, this process will easily lead to poor bolt effect, and the probability of repeated support or net drop will increase significantly

[0007] 2. Hollow threaded pipe: First, the operator needs a rock drill to drill the anchor hole. After the anchor hole is drilled, the hollow threaded pipe is inserted into the hole to fully contact the bottom of the hole, and then the hole chuck is installed. The filling hole reserved in the center of the opening is used to pour the mixed cement into the threaded pipe, and the threaded pipe is filled with cement, and the clips set on the hollow threaded pipe are flushed away and contacted with the rock wall, so that the threaded pipe is backlogged in the In the hole, it will not fall off, and then hang the mesh, place the chuck under the mesh and tighten it with a screw buckle, so that it completely touches the rock wall. The disadvantage of this method is that after the cement hardens, its own The hardness and strength are not good. If it encounters the shock of the surrounding seismic waves, it will cause tiny cracks, which will reduce the strength of the threaded pipe itself. The probability of the net is significantly increased, etc.

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