Drill hole inside secondary grouting leaking stoppage device

Abstract

The invention discloses a drill hole inside secondary grouting leaking stoppage device. The drill hole inside secondary grouting leaking stoppage device comprises an injection pipe composed of a plurality of single-section pipes which are connected in sequence, all the single-section pipes comprise gas injection pipes and grouting pipes, the grouting pipes are arranged inside the gas injection pipes in a sleeved manner, wherein the grouting pipes are connected with the grouting pipes, the gas injection pipes are connected with the gas injection pipes, the inner ends of the multiple mutually-connected gas injection pipes stretch out of the inner end of a gas extraction pipe, get over a fracture zone of a drill hole and are connected with and communicate with an inner end gasbag, the parts,located at the inner end of the gas extraction pipe, of the multiple mutually-connected gas injection pipes are connected with and communicate with an outer end gasbag, the gas extraction pipe and oneend of an inlet of the drill hole are further provided with a sealing body, the ends, located at the drill hole inlet, of the multiple gas injection pipes of the injection pipe are connected with gassupply equipment, and the ends, located at the drill hole inlet, of the multiple grouting pipes of the injection pipe are connected with grouting equipment. By means of the drill hole inside secondary grouting leaking stoppage device, precision grouting with pressure can be performed on the failure drill hole fracture development position, so that the gas extraction failure drill hole extractionfunction is activated and restored, and the gas extraction concentration and purity are increased.

Description

Technical field [0001] The invention relates to the technical field of gas drainage, in particular to a secondary grouting plugging device in a borehole. Background technique [0002] The air leakage of the borehole mainly includes two forms, namely, air leakage inside the hole and air leakage outside the hole. Such as figure 1 As shown, the air leakage in the hole exists in the area between the extraction tube and the borehole wall, including the air leakage of the sealing body material itself and the gap air leakage between the sealing body and the borehole wall. Air leakage outside the hole exists in the fissure area outside the borehole wall. Under the action of negative pressure, outside air enters the coal body through the fissures around the borehole. In order to analyze the reasons for the attenuation of gas drainage concentration more comprehensively, it is necessary to comprehensively consider the leakage inside the hole and the leakage outside the hole, so as to provi...

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Problems solved by technology

[0007] At present, the existing sealing technologies, such as hole sealing with hole sealer and capsule hole sealing, have certain shortcomings. Among them, the hole sealing device of the hole sealer is relatively heavy and inconvenient to operate. The hole sealing device of the hole sealer is used on the side of the coal seam roadway Because the shape of the hole is diffic

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