An annular airbag formwork for gob-side entry retaining concrete filling wall

Abstract

The invention discloses an annular air bag formwork of a gob-side entry retaining concrete filling wall. By using an annular air bag pressure bag mode, an annular air bag pressure bag is fixed through a displacement-resistant anchoring device and a horizontal lateral limit reinforcing device; the displacement-resistant anchoring device combines an annular air bag formwork with top and bottom plates into a whole; the horizontal lateral limit reinforcing device can effectively limit the transverse deformation of a filling wall body to ensure the successful retaining of the gob-side entry retaining, and can resist multiple times of top plate coming pressure, so that the integral stability of a concrete wall body is improved; the annular air bag pressure bag structure needs to be inflated before concrete filling into a filling cavity, and is used for carrying a rigid and flexible formwork support frame; after the annular air bag pressure bag is deflated, the annular air bag pressure bag is filled with concrete; and the annular air bag pressure bag and the concrete jointly form the filling wall body beside the gob-side entry retaining. A link of mounting and dismounting a steel formwork is omitted in the whole flow process; the waiting is not needed in the middle grouting flow process; the work intensity of workers is reduced; the continuous and fast filling operation is realized; and the close following with the work face advancing speed can be realized.

Description

technical field [0001] The invention relates to an airbag formwork, in particular to an annular airbag formwork of a gob-side entry retaining concrete filling wall. Background technique [0002] The gob-side entry retaining method adopts the mining method without coal pillar, that is, only one roadway is excavated as the mining roadway of the previous face and the gob-side entry retaining of the next face, which greatly improves the coal recovery rate and saves valuable coal resources. It is a major technological revolution in coal mining and reasonable arrangement of roadways in recent years. However, with the gradual depletion of shallow coal resources in my country, the mining of deep coal seams is gradually transferred. At the same time, it is accompanied by a series of obvious mine pressure, increased ground pressure, serious roadway deformation, difficult maintenance of well and roadway engineering, high repair rate, and increased repair cost. The problem, especially t...

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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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