Projecting coal bed edge top drill construction technique and method for eliminating pumping blind zone

Abstract

The invention discloses a construction method for outburst coal seam by drilling along the top and a method for eliminating mining blind areas, which are operated according to the steps: first, the construction of a top brushing drill site is carried out in the wall of a mining tunnel; second, a drilling machine is put in the top brushing drill site and the height of the drilling machine is adjusted so as to enable the drilling machine to construct coal holes along the top in the outburst coal seam; third, a group of coal holes is constructed in the top brushing drill site, and the hole opening angle of each coal hole is consistent with the obliquity or the pseudo obliquity of a coal seam roof at the upper part. The coal holes along the top are led to reach or run through the mining blind areas and even run through the width of sections or the width of straps of a coal mining working face; in complicated geological conditions or a tectonic zone, when the coal holes along the top are difficult to run through the mining blind areas, rock bores along the top can be constructed to reach above the mining blind areas, and then a blasting method or a hydraulic fracturing method is applied to the rock bores, so as to enable the rock bores along the top to be communicated with the mining blind areas by manual cranny; when the coal seam is relatively thick, strengthened coal holes can be constructed below the coal holes along the top.

Description

technical field [0001] The invention relates to a drilling technology for soft and outburst coal seams and a method for eliminating blind spots in the coal mining face of soft and outburst coal seams by using holes along the top coal. Background technique [0002] Deep hole drilling in outburst coal seams is a recognized worldwide problem. Due to the difficulty of drilling deep holes in outburst coal seams, that is, the depth of coal seam drilling is limited, there is an area in the middle of the coal mining face in outburst coal seams that is difficult to reach by coal seam drilling. The blind area not only affects the operating rate of the coal mining face, but also poses a safety hazard to the coal mining face. Many domestic outburst mines construct rock roadways in the coal seam floor rock strata, and drill through-layer drilling in the rock roadway to drill into the blind area of ​​drainage, that is, use the method of through-layer drilling to eliminate the blind area ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a top-drilling construction technology and drainage of outburst coal seams in view of the current situation that it is difficult to drill deep holes in outburst coal seams and it is difficult to eliminate or the cost of eliminating blank areas in coal mining face is too high. Blind area elimination method

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