Coal mine underground sealing wall and preparation method thereof

Abstract

The invention provides a coal mine underground sealing wall. The coal mine underground sealing wall comprises a first wall body, a filling material layer, a second wall body, arc-shaped fasteners, a gas drainage pipe, a drainage pipe and a plurality of grouting pipes with ball valves. The filling material layer is located between the first wall body and the second wall body. The arc-shaped fasteners are arranged at the connection joint of the upper part of the outer wall of the second wall body and the top plate, moisture-proof plastering layers are arranged on the outer surfaces of the firstwall body and the second wall body, the upper part of the first wall body and the upper part of the second wall body extend into a roof coal seam by 0.3m, the bottom part of the first wall body and the bottom part of the second wall body extend into a floor coal seam by 0.2m, the left part and the right part of the first wall body and the left part and the right part of the second wall body extendinto a wall coal seam by 0.5m, the gas drainage pipe is arranged at the upper left corner of the sealing wall, the drainage pipe is arranged on the lower side of the middle part of the sealing wall,and the multiple grouting pipes are arranged obliquely on the upper part of the second wall body at equal intervals in a penetrating mode. The wall of the sealing wall body is not prone to falling off, the sealing effect is prominent, and the upper gas accumulation is less.

Description

technical field [0001] The invention belongs to the field of coal mine safety, in particular to a coal mine lower sealing wall and a preparation method thereof. Background technique [0002] Spontaneous combustion of coal in goafs and excessive gas content are major threats to underground coal mines. After the coal in the coal mining face is mined, it is necessary to carry out airtight treatment in order to prevent the air leakage in the goaf from spontaneous combustion of the remaining coal in the goaf and to prevent the gas from gushing out of the goaf to other places, which is very important for underground fire and gas control in coal mines. important. [0003] Most of the closed walls in coal mines are made of bricks, and the walls are plastered with mortar. Due to the humid and cold climate and air oxidation in coal mines, as time goes by, the closed walls of coal mines will appear "peeling", that is, the walls of the closed walls will fall off, which will directly a...

AI Technical Summary

Problems solved by technology

Due to the humid and cold climate and air oxidation in coal mines, as time goes by, the closed walls of coal mines will appear "peeling", that is, the walls of the closed walls will fall off, which will directly affect the airtightness of the closed walls, making it difficult to maintain To prevent air leakage in the goaf, laying hidden dangers for the spontaneous combustion of coal left in the goaf and gas gushing out of the goaf to other places

[0004] At the same time, the accumulation of gas above the outer side of the airtight wall has always been a problem for coal mine workers, and the accumulation of gas above it will bring safety hazards to the coal mine

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