Nesting-type bag secondary grouting hole sealing device and method

Abstract

The invention relates to a single bag sealing and plugging integrated hole sealing device. The single bag sealing and plugging integrated hole sealing device includes double-layer bags, a grouting pipe, a plugging pipe, a hole sealing pipe, grouting jags, a plugging jag, a plugging pipe outlet fixing cloth cover, a plugging pipe tail end fixing cloth cover, a grouting jag cloth cover, a plugging jag cloth cover, check valves, and a plug, wherein the double-layer bags coat the outside of the hole sealing pipe, the two grouting jags and the plugging jag are arranged on the outer surfaces of thedouble-layer bags, one or more grouting holes are formed in the outer surfaces of the double-layer bags on the two sides of the grouting jags, the grouting pipe is arranged parallel to the hole sealing pipe, embedded in a grouting cavity and communicates with the grouting cavity through four or more check valves, a plugging pipe body is embedded in the double-layer bags, and the front end surfaceof the plugging pipe is located on the outer surfaces of the double-layer bags and connected with the plug. According to the single bag sealing and plugging integrated hole sealing device, on the onehand, the air hole condition generated in slurry blocks caused by solidification shrinkage of slurry is effectively eliminated while the solidification efficiency of the slurry is improved, on the other hand, according to the needs of drilling extraction operation, secondary blocking operation for drilling is carried out.

Description

technical field [0001] The invention relates to the field of underground gas drainage in coal mines, in particular to a threaded single-bag secondary grouting sealing device and a hole sealing method in the coal seam gas drainage. Background technique [0002] High-quality sealing of coal seam boreholes is a key technology for gas drainage, which directly affects the concentration of underground coal seam gas drainage. Patent CN201610215651.1 discloses a central grouting type single bladder bag grouting sealing device and its sealing method. The device has weak grouting ability to the borehole wall and can only realize one-time grouting of the borehole. Patent CN200710054384.5 discloses a bag-type grouting sealing device and its sealing method. Although the sealing device has achieved a certain application effect, it can only realize one-time grouting of the drilled hole. Patent CN201721649952.6 discloses a bag-type grouting sealer. The sealing device consists of two double...

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Problems solved by technology

Patent CN200710054384.5 discloses a bag-type grouting sealing device and its sealing method. Although the sealing device has achieved a certain application effect, it can only realize one-time grouting for drilling

Patent CN201721649952.6 discloses a bag-type grouting sealer. The sealing device consists of two double-layer bags, a grouting pipe, and a steel ring. In the process, the material secretes a large amount of water and exists between the two bladders, which increases the water-cement ratio of the slurry between the two bladders, seriously reduces the material performance, makes the material shrink after curing, and causes air leakage in the drilled hole

Patent CN201721698524.8 and patent CN201711294128.3 respectively disclose two-sack and three-sack plugging plugs, which can realize the functions of drilling, grouting and plugging, but the above two plugs have strong water permeability. During the grouting process, a large amount of water tends to accumulate between the two bladders, resulting in an imbalance in the water-cement ratio of the material in the grouting section, thereby reducing the sealing effect

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