Rapid dust removal method and device in tunnel

Abstract

The invention relates to a downhole quick dustfall method and a downhole quick dustfall device, which are characterized in that a drilling position of a heading is provided with a front-end hole by utilization of a drill; an annular area between a drill rod and the rock wall of the front-end hole is taken as a dustfall area in the front-end hole, and spray which is formed by inlet of compressed air and water together is led into the dustfall area; and the spray is maintained when the drill rod drills simultaneously. The downhole quick dustfall method and the downhole quick dustfall device can maintain using high-pressure blast to quicken normal drilling construction, and simultaneously effectively reduce the discharge capacity of downhole dust, thereby solving the problem of the hazard of the dust on the health of workers and the safety threat of the dust on mines.

Description

technical field [0001] The invention relates to a method and a device for capturing or reducing the dust generated by drilling in the drilling process of coal mine underground construction. Background technique [0002] During the drilling process of underground coal seam roadway along the coal seam, high-pressure air is generally used to discharge slag, and the high-pressure air discharges the coal and rock powder in the drill hole, resulting in a large amount of dust. Due to the limited space in underground tunnels, the generation of dust not only endangers the physical and mental health of employees, but also can cause coal dust explosions under certain conditions, seriously threatening the safe production of mines. When drilling in layers without dust removal device, the dust concentration on the return air side of the drilling rig will reach 94mg / m 3 . At present, the method usually used to control dust is to reduce the pressure of high-pressure air, use hydraulic sla...

AI Technical Summary

Problems solved by technology

At present, the method usually used to control dust is to reduce the pressure of high-pressure air, use hydraulic slag discharge as much as possible to reduce the generation of dust, or install spraying at the hole opening and the downwind side to purify the air, but these methods are It is a measure taken after the dust leaves the borehole. Although it can reduce the amount of dust, the effect is not significant. The use of hydraulic slag discharge is easy to make the coal seam in the borehole become mushy when the coal meets water, and it is difficult to discharge slag and easy Hugged with the drill pipe, a buried drilling accident occurs, and it is difficult to construct a long-distance drilling of more than 120m; and only the purification spray outside the drilling can only reduce the amount of dust by 30%, which cannot fundamentally solve the problem

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