Drilling and punching integrated construction process of comb-shaped long drill hole in end-located drainage roadway

Abstract

The invention belongs to the technical field of underground gas extraction, and discloses a drilling and punching integrated construction process of a comb-shaped long drill hole in an end-located drainage roadway. The drilling and punching integrated construction process comprises the steps of A, arranging a drilling field in the end-located drainage roadway; B, constructing a section of main hole in the drilling field along a working face, adjusting a screw motor to obliquely open a branch hole, and making the screw motor penetrate upwards through a coal seam to enter a top plate; C, pressurizing water by using a pressurizing pump, and opening a punching nozzle in a punching high-low pressure conversion device to spray a high-pressure water jet to the coal seam; D, clamping a triangularspiral groove drill rod to rotate back and forth by using a drilling machine, and discharging slag through a gap between the triangular spiral groove drill rod and the hole wall; and E, reducing waterpressure to normal water pressure after punching, making clear water pass through to a drill bit, returning the triangular spiral groove drill rod to the branch hole opening position, then continuingto drill and construct the main hole forwards, and repeatedly performing the steps until the whole incline length of the coal seam is covered. According to the drilling and punching integrated construction process, the single-hole gas extraction pure quantity can be improved, and the coal seam stoping speed can be accelerated.

Description

technical field [0001] The invention belongs to the technical field of underground gas drainage, and in particular relates to an integrated drilling and flushing construction technology for comb-shaped long drilling holes in bottom drainage lanes of coal mines. Background technique [0002] With the continuous expansion of coal mining efforts and scale and the continuous increase of mine mining depth, the amount of gas gushing out of coal seams is increasing, and the hidden dangers of gas disasters such as gas exceeding the limit and coal and gas outburst are becoming more and more serious. Safe and efficient control Gas has become the primary task of all high gas mines. For some mines, due to high coal seam gas content, soft coal seam, and poor air permeability, drilling along the coal seam is used to solve the problems of short gas extraction distance and poor drainage effect in the mining face, which seriously affects the progress of excavation and mining, and brings prod...

AI Technical Summary

Problems solved by technology

However, the current problem of comb-shaped drilling is that the distance between the coal-seeing points in the branch holes is large, and there is a blind spot in the extraction. Therefore, it is necessary to propose an integrated drilling and punching construction technology for comb-shaped long holes in the bottom extraction roadway to effectively solve these problems. question

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