Construction method for remained gateway along goaf under metal false roof beside coal pillar

Abstract

The invention discloses a construction method for a remained gateway along a goaf under a metal false roof beside a coal pillar. The construction method comprises the following steps that S001, a first hydraulic support, a second hydraulic support, a third hydraulic support and a fourth hydraulic support are arranged on a working face from the coal pillar to the goaf in sequence; S002, the first hydraulic support and the third hydraulic support synchronously move forwards by a first preset distance; S003, a timber crib is constructed on the rear portion of the third hydraulic support, a firstconcrete wall is constructed between the coal pillar and the first hydraulic support, and a second concrete wall is constructed on the inner side of the timber crib; S004, the second hydraulic supportand the fourth hydraulic support synchronously move forwards by a second preset distance; and S005, the above steps are executed repeatedly until the remained gateway along the goaf is well constructed. According to the construction method, by forming the timber crib on the side of the goaf through construction, a pouring space is reserved for pouring of concrete, the first concrete wall and thesecond concrete wall are formed through pouring, and the remained gateway along the goaf is formed between the first concrete wall and the second concrete wall.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a construction method for gob-side entry retention under a metal false roof next to a coal pillar. Background technique [0002] The key to the success of the gob-side entry retention technology is whether the support of the space to be poured by the flexible formwork concrete wall can adapt to the movement law of the metal mesh flexible false roof, and whether the metal mesh flexible false roof can be controlled in a timely and effective manner. The extra-thick coal seam is mined in layers, and the top layer is excavated and mined along the immediate roof. After the top stratification is completed, the remaining stratifications are excavated and mined along the metal mesh flexible false roof. When the working face is mining forward and the hydraulic support is moved, the metal mesh flexible false roof within the range of the hydraulic support cover beam and the tail beam im...

AI Technical Summary

Problems solved by technology

When the working face is mining forward and the hydraulic support is moved, the metal mesh flexible false roof within the range of the hydraulic support cover beam and the tail beam immediately sinks with the forward movement of the hydraulic support, causing the space to be poured in the flexible molded concrete wall to be poured. Measures cannot be taken in advance For support, the pouring space of the flexible molded concrete wall cannot be guaranteed

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