A method and support system for gob-side entry retention in medium-thick coal seams

Abstract

The invention relates to a medium-thickness coal seam gob-side entry retaining method and support system. The support system comprises an entry retaining roadway, four channel-steel anchor cable supports, three hydraulic props, a steel wire mesh, a pre-buried sidewall anchor rod, a linear articulated top beam, a crossed articulated top beam, iron shoes and Pi type steel. The hydraulic props and the top beam are connected into a whole and iron shoes are worn at the bottoms of the hydraulic props. The gob-side entry retaining method comprises the following steps:(1), constructing four channel-steel anchor cables for reinforcing supporting along the roadway and arranging the channel-steel anchor cables in a stepping manner; (2), constructing a top anchor rod outside an advance support of a working surface along with working surface mining in advance and mounting the steel wire mesh along the roadway in a hanging manner; pre-burying the sidewall anchor rod along with mining and hanging an anti-tear steel wire mesh along the roadway; (3), at the gob-side entry retaining section inside a working surface mining line, adopting telescopic hydraulic props for supporting. According to the invention, a support body on one side of the roadway is constructed by using rock collapsed from the roof, so that the construction is simple, the cost is low and high safety is realized. The hydraulic props, iron shoes, Pi type steel, cross articulated top beam and the steel wire meshes are combined for supporting, so that the stability of the support system is improved.

Description

technical field [0001] The invention belongs to the technical field of mining, and relates to a method and a support system for retaining roadways along gobs in medium-thick coal seams. Background technique [0002] Gobside retaining is a special technical treatment measure for wall mining in coal mines. During wall mining, the roadway during the mining process of the working face is reserved for ventilation, material transportation, drainage of the working face or for the next working face. mining. The method of retaining the roadway is to keep the original slot along the edge of the gob along with the push of the working face. Gobside retaining can maximize the recovery of resources and avoid loss of coal pillars. Gobside retaining technology can change the succession sequence of the traditional working face in the mining area, reduce the tunneling rate of 10,000 tons of the mine, increase the recovery rate of the mining area and the mine recovery rate, and have signific...

AI Technical Summary

Problems solved by technology

[0003] Our country has done a lot of fruitful research on gob-side entry technology research, and achieved relatively good application results, especially in thin coal seams. In recent years, the application cases in medium-thick and thick coal seams have continued to increase. The main application The filling body reengineering roadside retaining technology has a good overall application effect, but its main problem is that the process is complicated and the cost of retaining roads is high

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