Coal mine underground bottom pumping roadway crossing borehole anti-hole spraying construction method

Abstract

The invention provides a coal mine underground bottom pumping roadway crossing borehole anti-hole spraying construction method. The method comprises the following steps of (1) installing a hole drilling and reaming section hole sealing pipe; (2) connecting a connecting port of a wing-shaped water slag gas diverter with a lower port of the hole drilling and reaming section hole sealing pipe; (3) correspondingly connecting the wing-shaped water slag gas diverter, a negative pressure energy accumulator, a water slag collector, a control system and a gas extraction pipeline in a roadway; (4) arranging a drill rod sealing guide device on a drill rod in a sleeving mode, wherein the drill rod sealing guide device is fixedly connected to a middle connecting port of the wing-shaped water slag gas diverter, the drill rod is arranged on a drilling machine, and the drilling machine is fixed; and (5) starting the drilling machine to perform drilling operation. According to the method, the principleis scientific, the design is reasonable, the automation degree is high, gas, water and coal slag can be conveniently separated from one another in the crossing borehole construction process, and thegas overrun accident caused by the fact that the gas is poured into the roadway when hole spraying occurs in the bottom pumping roadway drilling construction process is prevented.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and in particular relates to a construction method for drilling blowout prevention holes through layers in bottom drainage lanes of coal mines. Background technique [0002] Bottom pumping roadway, also known as floor roadway, is located in the rock formation below the coal seam, and refers to the roadway arranged on the floor of the coal seam. Gas drainage from the coal seam floor roadway to the coal seam construction through-bed drilling has become a necessary means for regional and local outburst reduction in high gas mines and coal and gas outburst mines. In the construction process of drilling through layers, hydraulic slag removal and hydraulic coal cutting are generally used. After the drill pipe enters the coal seam, a large amount of gas, accompanied by coal slag and water, rushes out of the borehole instantly, which can easily cause spray holes and cause floor damage....

AI Technical Summary

Problems solved by technology

In the construction process of drilling through layers, hydraulic slag removal and hydraulic coal cutting are generally used. After the drill pipe enters the coal seam, a large amount of gas, accompanied by coal slag and water, rushes out of the borehole instantly, which can easily cause spray holes and cause floor damage. Gas overrun alarm in the roadway, causing gas accidents, affecting production in mild cases, and causing casualties in severe cases

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