Steeply inclined seam working face shielding and retracing method

Abstract

A steeply inclined seam working face shielding and retracing method is suitable for steeply inclined working face extraction work. When a working face is pushed to the position which is 25m away from a stop line, plastic steel nets are paved between the upper portions of top beams of hydraulic supports and a coal seam top plate. The hydraulic supports move forward when the working face is pushed forward, and the plastic steel nets are continuously paved. Bottom plate anchor rods are arranged in gaps between the hydraulic supports and penetrate through mesh openings of the plastic steel nets to anchor the plastic steel nets and form bottom plate fixing points when the plastic steel nets are buried and pressed by goaf gangue. After the working face reaches the stop line, new plastic steel nets are not paved any more, top plate anchor rods are arranged on a working face top plate and penetrate through the plastic steel nets between the hydraulic supports, the plastic steel nets are anchored on the working face top plate, and therefore top portion fixing points are formed. Due to the fact that the plastic nets form a protective screen between the fixing points of on the coal seam top late and the fixing points on a coal seam bottom plate, the goaf gangue is prevented from flowing into the working face, the smooth retracing of working face devices is ensured, and the working environment of workers is improved. The steeply inclined seam working face shielding and retracing method is simple, easy to execute and high in safety and has wide practicability.

Description

technical field [0001] The invention relates to a working face retraction method, in particular to a coal seam working face cover retraction method suitable for back mining of a steeply inclined working face. technical background [0002] When mining in a steeply inclined working face in a coal mine, due to the influence of the structure, the structural stress is relatively large, and the damage range of the coal seam is large. The falling gangue will not stay in place due to the small "compaction" of the roof, and will slide down along the bottom plate under the action of gravity, causing the falling gangue to pour into the working face from the back of the working face, threatening the safe production of the working face. When the working face advances to the position of stop mining line, the mining is stopped and the working face is moved. When the support is retracted, the method of retracting from bottom to top or from top to bottom is generally adopted. When the suppor...

AI Technical Summary

Problems solved by technology

[0002] When mining in a steeply inclined working face in a coal mine, due to the influence of the structure, the structural stress is relatively large, and the damage range of the coal seam is large. The falling gangue will not stay in place due to the small "compaction" of the roof, and will slide down along the bottom plate under the action of gravity, causing the falling gangue to pour into the working face from the back of the working face, threatening the safe production of the working face

When the working face advances to the position of stop mining line, the mining is stopped and the working face is moved. When the support is retracted, the method of retracting from bottom to top or from top to bottom is generally adopted. When the support is withdrawn, the gangue behind the support is lacking This will not only prevent the remaining equipment from continuing to retreat, but also change the stress state of adjacent supports, causing the supports to fall, which is very difficult to handle

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