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Coal mine hard roof grouting fracturing method and system

A hard roof and grouting technology, which is applied in ground mining, earth square drilling, underground mining, etc., can solve the problems of hard roof collapse at the end mining section, end hanging disaster, low labor intensity, etc., and achieve the fracturing process Stable, controllable safety issues, and convenient operation

Inactive Publication Date: 2018-11-06
SHAANXI COAL & CHEM TECH INST
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Problems solved by technology

[0003] The purpose of the present invention is to make up for the above-mentioned deficiencies, and provide a method and system for grouting and fracturing of hard roofs in coal mines to solve the problems of hanging roof disasters at the end of working faces in coal mines and the collapse of hard roofs at the end of the mining section. Features of low strength, no noise, no pollution, low calorific value, low cost and relatively safe operation

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  • Coal mine hard roof grouting fracturing method and system
  • Coal mine hard roof grouting fracturing method and system

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] refer to figure 2 , the coal mine hard roof grouting fracturing system of the present invention comprises agitation-grouting equipment 2, a grouting sealing device, a mobile flatbed car and a sealing film bag push rod, and the agitation-grouting equipment 2 comprises a mixer, a grouting equipment connected in sequence The machine and the grouting pipe 3, the mixer and the grouting machine are all arranged on the mobile flatbed truck, which is convenient to move. The pump 6, the slurry inlet rod 4 are connected with the slurry outlet pipe 3.

[0028] Preferably, the agitator, the grouting machine and the grouting pipe 3 of the present invention are respectively a pneumatic agitator, a pneumatic grouting machine and a high-pressure rubber hose for grouting, and the single-hole stirring capacity of the pneumatic agitator ranges from 81.5L to 172.5L; The grouting...

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Abstract

The invention discloses a coal mine hard roof grouting fracturing method and system. Chemical expansion slurry is injected into roof holes through stirring-grouting equipment and a grouting hole-sealing device, sealing film bags are mounted in the holes, and the effect that during grouting, the slurry does not leak towards peripheral fractures of the holes is achieved. Through the volume expansionreaction principle of the slurry, a designed roadway roof is subjected to blastproof drilling fracturing, and the effect of destroying the integrity of the hard roof is achieved. The problems of coalmine hard roof suspension, the tail mining section roof pressure and hard coal body caving can be solved. The coal mine hard roof grouting fracturing method and system have the characteristics of small downhole operation engineering amount, low labor intensity, good fracturing effect and the like.

Description

technical field [0001] The invention mainly relates to the technical field of coal mine underground engineering, especially to engineering fields such as the ends of the two parallel grooves of the working face, the working face of the cut hole, and the fracturing of the hard roof above the withdrawal roadway of the final mining section, and specifically relates to a grouting press for the hard roof of the coal mine. Fragmentation method and system. Background technique [0002] Regarding pressure relief methods for hard roofs, common methods in China mainly include post-mining two-lane roof breaking method, small-diameter shallow hole caving method, pre-mining deep hole pre-splitting blasting, CO 2 Blasting to cracking, high-pressure water fracturing, and water injection softening to cracking, etc., but the current methods either have the problem of large amount of construction and difficulty, or in the construction process, some methods need to use explosives for blasting,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 吴学明王苏健刘孝贤苗彦平黄克军刘文静
Owner SHAANXI COAL & CHEM TECH INST
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