Method for recovering stagnant coal pillars left by breast type coal mining method

Abstract

The invention provides a method for recovering stagnant coal pillars left by a breast type coal mining method, which is used for a low-gas shallow coal seam with stable top board, smaller mine pressure and coal seam inclination angle, flat baseboard, hard and stable coal quality, no-water pouring top board and hard spontaneous ignition. The coal pillars are recovered with different regions, every three rows of the coal pillars is taken as a distribution unit, and air curtains are arranged between the three rows of the coal pillars and the coal pillars to form into an air inlet passageway and an air retuning passageway; and from the two rows of regular coal pillars beside a goaf, every two rows of regular coal pillars is taken as a recovering unit, the recovering unit is internally provided with a crawler belt walking type hydraulic bracket, a continuous coal mining device and an advanced supporting hydraulic bracket, the stagnant coal pillars are alternately and slantwise cut by means of both wings according to the recovering unit, the recovering unit stopes and withdraws, the stagnant coal pillars and the hydraulic bracket jointly support the top board above a recovering space, and the top board is managed by means of a complete top board falling method. Therefore, by matching with the continuous coal mining device, the scraping board conveying device and the adhesive tape conveying device, the method can recover the regular stagnant coal pillars left by a breast type coal mining method.

Description

technical field [0001] The invention relates to a method for recovering sluggish coal pillars left over from a room-type coal mining method, and is especially suitable for applications where the roof is relatively stable, the mine pressure is small, the inclination angle of the coal seam is below 10°, the floor is relatively flat, the coal quality is hard and stable, and the roof is free from water spraying. , and low-gas shallow coal seams that are not prone to spontaneous combustion. Background technique [0002] The essence of the pillar system coal mining method is to excavate a series of coal rooms with a width of 5-8m in the coal seam. It ranges from more than 20 meters. Coal mining takes place in the coal room. The coal pillar can be left unmined according to the conditions, or the coal pillar can be mined as much as possible after the coal room is mined. The method of leaving the coal pillar without mining is called the room-and-pillar mining method, and the metho...

AI Technical Summary

Problems solved by technology

However, there are very few engineering practice studies on the coal pillar recovery of the fully open type (the entire coal room is recovered and the coal pillar is recovered), and there are very few practical and theoretical studies in this regard.

Images