Hole sealing structure and hole sealing method as well as expansive cement for sealing hole

Abstract

The invention discloses a hole sealing structure and a hole sealing method as well as expansive cement for sealing a hole. The hole sealing structure comprises a gas collecting pipe arranged in a drilled hole and a grouting pipe, wherein front and back end caps are respectively arranged on the periphery at the two end parts of the gas collecting pipe; each one of the front and back end caps comprises flexible textiles winding the outer periphery of the two end parts of the gas collecting pipe, and the expansive cement which is coated on the flexible textiles when being wetly dispersed, and then is matched with the outer wall of the gas collecting pipe and the inner wall of the drilled hole in a sealed manner after being expanded and cured; the grouting pipe is arranged on the front end cap in a penetrated manner; and the outlet of the grouting pipe is located between the front end cap and the back end cap. The front and back end caps are formed after the expansive cement coated at the two ends of a gas pumping pipe is expanded, and after the expansive cement is expanded, better expansive seal can be formed between the expansive cement and the hole wall of the drilled hole as well as between the expansive cement and the gas collecting pipe; slurry is poured into the drilled hole through the grouting pipe, and cracks on the periphery of the drilled hole can be better sealed to keep that a hole sealing cavity is at a pressure bearing state; and the condensing time of the expansive cement is shorter, the hole sealing cost is low, and high-pressure equipment does not need to be additionally purchased.

Description

technical field [0001] The invention relates to a hole-sealing structure and a hole-sealing method for gas drilling in coal mines and expansion cement used for hole-sealing. Background technique [0002] In the prior art, after drilling, some holes need to be sealed before proceeding to the next step, such as the gas extraction technology. The effect of gas extraction is mainly related to the sealing effect of the drilled hole. The dynamic sealing technology is in the In the process of gas drainage, the hole sealing effect of the drilling is always guaranteed to be good. At present, the commonly used sealing device such as the Chinese patent announcement number is CN201206471Y, and the announcement date is March 11, 2009, and the name is "drainage drilling sealing device" The description discloses a drainage drilling sealing device, which includes a sealing casing, a gas collection pipe and a grouting pipe. The outer peripheral surface of the sealing casing and the inner wal...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a sealing structure, on the basis of ensuring the quality of the sealing, the hole is tight and air-tight, and solves the problems of complicated sealing process, long solidification time and high cost in the prior art, and at the same time The present invention also relates to a hole sealing method, and simultaneously the present invention also relates to an expansive cement

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