Composite roof thin seam fully-mechanized coal mining face gob-side entry retaining method

Abstract

Provided is a composite roof thin seam fully-mechanized coal mining face gob-side entry retaining method. An anchor cable beam strengthening support is repaired after a diamond net is hung on an advance face in a lane, the advance face is 1.6m, side opening is 6.0 in width, and a single prop is used for being matched with an articulated roof beam support after the diamond net is hung on a side opening section formed by side opening. A temporary support section is arranged beside the lane, a 4.5m long diamond net is hung on the temporary support section, and then the single prop is adopted to be matched with an articulated roof beam temporary support. When an erecting timber crib is filled beside the lane, a gangue bag is filled while withdrawing column beside the lane. The center of the timber crib is 1.85m away from a lateral column of a goaf close to a lane side, a distance between two adjacent timber cribs is 8.0m, the length of the timber cribs is 1.5m, the width of the timber cribs is 1.5m, the height of the timber cribs is equal to mining height of tail of a working face, and the position between the timber crib is filled by the gangue bags.

Description

technical field [0001] The invention relates to a method for retaining entry along gobs, in particular to a method for retaining entry along gobs in fully mechanized mining working faces with thin coal seams on composite roofs. Background technique [0002] In gob-side retaining, the roadside support body needs to meet the requirements of high strength, timely roof cutting, good airtightness, and certain shrinkability to adapt to the movement of the basic roof. In 1991, our country introduced high-water filling technology from abroad, and successfully tested the roadside filling technology of pumping high-water quick-setting materials in different mines. This is a major breakthrough in gob-side entry retention technology. However, mine-used pumping high-water solidification filling materials are used for roadside filling, the construction process is complicated, the equipment occupies a lot, the strength of the wall is low, it is difficult to withstand the pressure of the la...

AI Technical Summary

Problems solved by technology

However, mine-used pumping high-water solidification filling materials are used for roadside filling, the construction process is complicated, the equipment occupies a lot, the strength of the wall is low, it is difficult to withstand the pressure of the lagging working face, the cost is relatively high, and the consumption of man-hours is large. Not suitable for large-scale promotion

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