Gob-side entry retaining concrete filled wall annular air bag construction method

Abstract

The invention discloses a gob-side entry retaining concrete filled wall annular air bag construction method. The construction method adopts an annular air bag pressure bag mode, and an annular air bag pressure bag is fixed through anti-displacement anchorage devices and horizontal lateral confinement reinforcement devices. The anti-displacement anchorage devices make annular air bag formworks and top and bottom plates integrated to form a whole. The horizontal lateral confinement reinforcement devices can effectively limit transverse deformation of a filled wall body, ensure successive gob-side entry retaining, can resist multiple times of pressure from the top plate and improve the overall stability of the concrete wall body. Before concrete is cast into a filling cavity, inflation is needed, the annular air bag pressure bag structure bear rigid and flexible formwork supports for usage. After the annular air bag pressure bag is deflated, the bag is filled with concrete, the bag and the concrete jointly form a gob-side entry retaining lateral filled wall, the links of steel formwork erection and steel formwork dismounting are omitted in the whole process, a middle grouting process is not needed to be waited, the labor intensity of workers is reduced, continuous and rapid filling operation is achieved, and the face advancing speed can be improved.

Description

technical field [0001] The invention relates to a construction method of a filling wall, in particular to a construction method of an annular air bag of a concrete filling wall along a gob-side entry. Background technique [0002] The gob-side entry adopts the mining method without coal pillars, that is, only one roadway is excavated as the recovery roadway of the previous mining face and the gob-side entry retention of the next mining face, which greatly improves the coal recovery rate and saves valuable coal resources It is a major technological revolution in coal mine mining and rational layout of roadways in recent years to alleviate the tense situation of mining replacement. However, as my country's shallow coal resources are gradually depleted, they are gradually shifted to deep coal seam mining. At the same time, there are a series of problems such as obvious mine pressure, increased ground pressure, serious roadway deformation, difficult maintenance of mine roadway e...

AI Technical Summary

Problems solved by technology

However, as my country's shallow coal resources are gradually depleted, they are gradually shifted to deep coal seam mining. At the same time, there are a series of problems such as obvious mine pressure, increased ground pressure, serious roadway deformation, difficult maintenance of mine roadway engineering, high repair rate, and increased repair cost. Problems, especially the fracture of the old roof, which leads to uneven force on the top of the filling body beside the gob-side entry retaining, which brings about the bias force of the filling body. In the light case, the filling body is deformed or slipped, and in severe cases, it can cause the overall instability damage, causing safety hazards such as roof caving, gas outburst, and water inrush in the goaf

[0003] The existing roadside filling technology still faces the following problems: With the improvement of the mechanization level of coal mining, the "three machines" of the mining face implement continuous mining, and the commonly used roadside filling technology and construction method are intermittent operations, which are difficult to keep up with The speed of coal mining seriously affects the recovery efficiency; the commonly used rigid formwork has poor filling and roofing effect at the side of the roadway, easy to run out of slurry, unable to achieve full roofing and rapid pressure bearing of concrete; when filling bags are used as formwork, there are filling bags that are easy to squeeze The concrete that has just been poured is easily deformed under pressure and flow in the filling bag to affect the final setting strength of the concrete, which may cause the failure of the gob-side entry retention or increase the cost of repair; the commonly used gob-side entry retention and roadside filling construction The process is cumbersome, and the labor intensity of the workers is high. It is often necessary to erect the formwork and remove the formwork, which not only wastes time, but also makes it difficult to achieve rapid and continuous operations of filling and reinforcing the supporting wall.

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