A kind of hole sealing device for coal mine

Abstract

The invention discloses a hole packer for a coal mine. The hole packer comprises a water injection pipe, a pressure bearing pipe and two steel hoops, wherein the water injection pipe is arranged in an inner cavity of an extraction pipe and penetrates through the pipe wall to form an opening; the pressure bearing pipe wraps the extraction pipe and covers the opening; and the two steel hoops are located on the two sides of the opening and fix the pressure bearing pipe to the extraction pipe in a sealing mode. The pressure bearing pipe at least comprises one rubber layer and one woven cloth layer. When rubber substances inside the pressure bearing pipe deform along with deformation of a drill hole in later period of extraction, the pressure bearing pipe can always keep in tight fit with the wall face of the drill hole, and long-term sealing of the drill hole is achieved. Meanwhile, a coagulation capsule does not need to be installed inside the pressure bearing pipe, namely high-pressure water is adopted for supporting the pressure bearing pipe, and good sealing of the drill hole is kept always. The hole packer for the coal mine is simple and reliable to operate and good in blocking effect, the labor intensity of operators is greatly relieved, and the problem that when solid hole sealing materials like polyurethane are adopted, sealing is not tight due to deformation of the drill hole after extraction is conducted for a period is solved.

Description

technical field [0001] The invention relates to a hole sealing device for permanently sealing boreholes in coal mines, in particular to a hole sealing device for coal mines. Background technique [0002] With the increase of coal mining depth, many coal mines are facing the problem of difficult pre-extraction of coal seam gas with high gas and low permeability, which seriously restricts the safe production of coal mines. The most important means to solve the problem of gas gushing and outburst in the process of mine mining is to use gas drainage. However, in the process of gas extraction, there are also various problems such as low extraction concentration, poor effect, and short duration. One of the most important restricting factors is the sealing ability of the borehole, which directly restricts the drainage effect of the borehole. In order to improve the drainage effect of boreholes and prolong the use time of boreholes, the most widely used method in my country with t...

AI Technical Summary

Problems solved by technology

Although the cement mortar has a certain strength, because the cement tends to shrink after solidification, cracks will be formed on the wall of the borehole, resulting in air leakage. crack

In addition, mines usually also use polyurethane to seal holes. However, due to the nature of polyurethane, after a period of sealing, it will be deformed under the action of ground pressure, and then lose its close contact with the coal wall, resulting in air leakage. , to disable the borehole

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