Method for preventing hydraulic bracket in large inclined angle workface from collapsing

Abstract

A method for preventing a hydraulic bracket in a large inclined angle working face from collapsing comprises the steps of obliquely driving an anchor rod in the middle of each hydraulic bracket in the working face along direction of from the top plate to the coal wall; connecting exposed ends of anchor rods in series by using steel wire ropes and hanging a metal net on the connected steel wire ropes; when the hydraulic brackets move forward, jacking the hung metal net to attach front beams of the hydraulic brackets; with advancing of the mining working face, enabling the hydraulic brackets to move forward, splicing and lengthening the metal net till the metal net is paved on the whole hydraulic bracket or stopping splicing the metal net after the top plate is stable and does not collapse. The method has the advantages of simple operation, safety, reliability and high efficiency, and effectively prevents the hydraulic bracket in the large inclined angle working face from collapsing under a condition that the top plate is crushed.

Description

technical field [0001] The invention relates to the field of coal mining methods, in particular to a method suitable for preventing a hydraulic support from toppling under the condition of a broken roof on a working face with a large inclination angle. Background technique [0002] In recent years, the mining of high-dip coal seams (20°-35°) has become more and more common in my country. There are two reasons: First, there are abundant high-dip coal seams in the west. Although high-inclination coal seams only account for about 17% of the country's reserves, more than 50% of mines in western mining areas have high-inclination coal seams, and high-inclination coal seams are the main mining coal seams in many mining areas or mines. The second is that many years of mining have depleted the reserves of "superior" coal seams in the eastern mining area. With the continuous increase of coal mining intensity, many mines have to shift from relatively "superior" coal seam mining to com...

AI Technical Summary

Problems solved by technology

When the roof is broken, the above method is difficult to achieve a good effect. At this time, the bracket is prone to roof fall due to leaks between the racks and the roof is not solid, resulting in an inverted rack

At present, there is no effective solution for how to prevent the support from toppling under this condition. The existing methods of scaffolding and net laying are complex in process, labor-intensive, and ineffective. It is necessary to expand the scope

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