Coal-mine gas extraction drilling pressurized grouting rapid hole packer and use method thereof

Abstract

The invention discloses a coal-mine gas extraction drilling pressurized grouting rapid hole packer and a use method thereof. A hole packer comprises a grouting pipe and capsular bags, wherein the grouting pipe is divided into a front second and a rear section; a double-circular air pressure blast valve is arranged between the front-section and rear-section grouting pipes; the double-circular air pressure blast valve is connected with the grouting pipes on the two sides through a thread head and a withholding type rubber hose connector; the front-section grouting pipe and the rear-section grouting pipe are sleeved with a capsular bag respectively; the two ends of the capsular bag on the front-section grouting pipe are withheld and fixed on the grouting pipe through a metal sleeve; the front end of the capsular bag on the rear-section grouting pipe is withheld and fixed on the grouting pipe through a metal sleeve while the rear end is fixed on the grouting pipe through a plug; and the part of the grouting pipe surrounded by the two capsular bags is provided with an annular one-way valve. In the coal-mine gas extraction drilling pressurized grouting rapid hole packer, airtight hole sealing is realized by the pressurized grouting technology; the hole packer has the advantages of multi-layer pressurized grouting and strong hole sealing airtightness; and moreover, the whole structure is simpler, the hole sealing operation is simpler and more reliable, and the airtight effect is better.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage drilling, in particular to a pressure grouting fast hole sealing device for coal mine gas drainage drilling and a method for using the same. Background technique [0002] Existing coal mine gas drainage drilling technology: 1. Polyurethane sealing technology: Domestic coal mine gas drainage drilling generally adopts polymer polyurethane chemical materials to seal holes. [0003] 2. Mechanical elastic sealing technology. [0004] 3. Inflatable hole sealer: There are two main types of inflatable hole sealer, one is the non-inflatable airbag type, and the other is the inflatable airbag type. [0005] 4. Hydraulic expansion type hole sealer. [0006] 5. Coal mine gas pressure fast grouting hole sealing device. [0007] Defects of the above prior art: 1. Polyurethane sealing technology: this sealing method has two disadvantages: first, low compressive strength; second, large compressi...

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Problems solved by technology

[0007] The defect of above prior art: one, polyurethane sealing technology: this sealing method has the shortcoming of two aspects: the first, compressive strength is low; Second, compressible amount is very big

[0008] 2. Mechanical elastic hole sealing technology: This sealing method has poor sealing performance on the borehole and serious air leakage, so it cannot be used for long-term drainage of coal seams.

[0009] 3. Inflatable hole sealer: it can only be used as a temporary hole sealer

[0010] 4. Hydraulic expansion type hole sealer: This kind of hole sealing is not feasible for long-term drainage of coal seams. There are two reasons: first, the cost is high; second, the micro-leakage of the hole sealer cannot guarantee long-term sealing. Effect

The disadvantage is that the traditional grout return pipe is retained, and the structure is not simple enough; the pressure gauge is installed in the grout return pipe. When the surrounding rock is relatively broken and the grouting time is long, the cement slurry in the grout return pipe may precipitate and solidify, causing pressure Inaccurate gauge pressure measurement affects the monitoring of pressure grouting

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