Short-section temporary gob-side entry retaining method

Abstract

The invention relates to a short-section temporary gob-side entry retaining method which comprises the following steps: step 1, prefabricating a high-strength concrete block on the ground for reservation; step 2, forming a rectangular notch on a working surface coal wall at the side of an air inlet entry and carrying out the anchor rod (cable) support to a top plate; step 3, transporting the high-strength concrete block to the position of an entry retaining and establishing an entry-side wall body with the high-strength concrete block on the edge of a gob, so that the air inlet entry behind the working surface forms a gob-side entry retaining; step 4, constructing and establishing a closed wall at the position 1-2 m away from the rear part of a return air contact entry to seal the gob-side entry retaining and the return air contact entry and ensuring that the length of the gob-side entry retaining entry does not exceed the spacing of the contact entry; and step 5, carrying out repeated operation according to the steps (2)-(4) in the recovery process of the working surface. The short-section temporary gob-side entry retaining method greatly simplifies the technical difficulty of the entry remaining, provides the extraction space for the gas control, reduces the entry tunneling quantity, greatly reduces the preparation time of the working surface and avoids the later entry maintenance work required by the prior gob-side entry retaining.

Description

Technical field [0001] The invention relates to the technology of retaining roadways along goafs in coal mines, in particular to a short-section temporary roadway retention method along goafs. Background technique [0002] The coal mining face adopts the method of retaining roadways along the goaf. After the working face is advanced, the original roadway is retained along the edge of the goaf and used as a return airway to form a Y-shaped ventilation method on the working face, which can effectively solve the working face The upper corner of the gas accumulation is difficult, and it can also provide space support for comprehensive gas management, so it has been widely used in gas mines. [0003] The existing technology of retaining roadways along the goaf is to retain the full length of the mining roadway after the working face is pushed through. Because the length of the mining roadway in large mines often reaches thousands or even more than two thousand meters, the service time o...

AI Technical Summary

Problems solved by technology

Therefore, manual repair of the roadway is required immediately after the deformation of the retained roadway is stable, resulting in concentrated operation of workers near the working face, which brings inconvenience to safety production management

Due to the poor deformation resistance of some high ground pressure or high ground pressure soft rock roadways, repeated roadway repairs are required after the roadway is retained, with a large amount of work and harsh operating environment

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