Outburst prevention measure in wire saw joint-cutting region of coal seam floor

Abstract

The invention discloses an outburst prevention measure in the wire saw joint-cutting region of a coal seam floor. The measure comprises the steps of 1, ascertaining the occurrence status of a coal seam; 2, respectively digging two cross holes in the coal seam via two drainage lanes different in elevation and arranged up and down, so as to form four mutually parallel and squarely arranged cross holes; 3, conducting the directional drilling operation by a directional drilling machine to communicate every twp adjacent cross holes, and communicating the end moraines of the four cross holes to form a quadrangular channel by four directional drilled holes; 4, guiding wire saws to be located inside the directional drilled holes during the retreating process of the above directional drilling machine after the directional drilling operation and finally connecting the wire saws inside the four directional drilled holes in the series connection manner; 5, installing a wire saw kerf winch on the end moraine of one cross hole at the lower elevation, driving the serially connected wire saws by means of the wire saw kerf winch, and continuously tightening a cutting rope to conduct the lancing operation. The above measure is small in construction workload, short in time duration, low in cost and good in outburst prevention effect.

Description

technical field [0001] The invention belongs to the technical field of outburst prevention measures for preventing and controlling coal and gas outburst areas, and in particular relates to an outburst prevention measure for a wire saw slit area on a coal seam floor. Background technique [0002] At present, there are two types of regional outburst prevention measures for the prevention and control of coal and gas outburst at home and abroad: mining protection layer and regional coal seam gas pre-extraction, and mining protection layer is the most effective measure. However, the cost of mining the protective layer is high and the time is long. Moreover, most of the protective layers themselves have outstanding risks, and regional outburst prevention measures must also be implemented. Once the gas control effect of the protective layer is poor and the time is long, it will affect the safety of the entire coal mine. Succession deployment, benefits, and thus mining protection la...

AI Technical Summary

Problems solved by technology

However, the cost of mining the protective layer is high and the time is long. Moreover, most of the protective layers themselves have outstanding risks, and regional outburst prevention measures must also be implemented. Once the gas control effect of the protective layer is poor and the time is long, it will affect the safety of the entire coal mine. Succession deployment, benefits, and therefore mining protection layer is also a bottleneck that restricts the overall situation

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