Single-bag grouting hole sealing device for upward crossing boreholes and hole sealing method adopting single-bag grouting hole sealing device

Abstract

A single-bag grouting hole sealing device for upward crossing boreholes comprises a recoverable grouting pipe, a grouting pipe joint, a front gas extraction pipe, a drainage device, a double-orifice pipe, an expansion bushing, an expansion bag, a pressure control valve and a rear gas extraction pipe, wherein the recoverable grouting pipe is communicated with a grouting channel of the double-orifice pipe through the drainage device, during use, the hole sealing device is arranged on the front gas extraction pipe in a sleeving manner through the drainage device, slurry is injected into the hole sealing device through the recoverable grouting device, and the expansion bushing and the expansion bag after filled with slurry expand to seal and plug the boreholes; grouting hole sealing of the inclined boreholes at different angles is realized by adjusting the position of the pressure control valve on the hole sealing device. More effective grouting hole sealing on the boreholes in the inclined borehole sealing section can be realized, and production and development of gas leakage cracks around the boreholes in the borehole sealing section are better prevented; according to a method, grouting under set pressure is performed by the pressure control valve on the hole sealing device, so that the grouting section is lengthened, and the hole sealing effect of the inclined boreholes is further enhanced.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas drainage drilling, and in particular relates to a single-bag grouting sealing device and a hole sealing method for upward drilling through layers. Background technique [0002] In coal mines, the drilling depth of gas drainage in this coal seam is generally 50 meters or even hundreds of meters, and only a certain distance from the hole opening is sealed. It is difficult to seal by direct grouting except for inclined drilling. The sealing of drainage drilling is divided into permanent sealing and temporary sealing. At present, the known permanent sealing of drilling holes for gas drainage in this coal seam uses foamed polyurethane, foamed cement and other foaming materials as sealing materials. The early "cement roll sealing device" (ZL90227075.3) has been It is no longer used, and the direct drilling method of drilling is only suitable for inclined drilling. At present, foamed polyurethane ...

AI Technical Summary

Problems solved by technology

At present, the patent titles are "bag type grouting sealing device and its sealing method" (ZL200710054384.5) and "gas drainage center split grouting sealing device and its sealing method" (ZL201110120920.3). A good sealing effect has been obtained, but with the release of the elastic potential of the coal body and the reduction of the gas pressure in the coal seam, the gaps around the drilled hole gradually develop and expand, and the coal seam drilled hole cannot be sealed tightly, and gas leakage occurs , it is difficult to maintain the grouting pressure, and the ideal sealing effect cannot be achieved

In addition, due to the differences in geological conditions of coal seams in different coal mines, hole collapse often occurs, which makes the hole sealer with a larger diameter unable to be inserted into the coal seam borehole smoothly, which has a certain impact on hole sealing

Moreover, the previous hole sealers are double-pocket, the processing is more complicated, and the cost is relatively high

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