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Method for using deep hole pre-grouting to reinforce top plate

A pre-grouting and pre-reinforcement technology, applied in earthwork drilling, shaft lining, tunnel lining, etc.

Inactive Publication Date: 2014-07-02
折俊杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small diffusion radius of cement slurry, long initial setting time, poor grouting effect and expensive polymer materials, the price per ton is about 30,000 yuan or more and shallow grouting has a serious impact on production, so it cannot provide large mining height work face production efficiency, so it cannot be popularized and used in large mining height working faces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] 1) According to the geological data raised in the large mining height working face, and according to the range to be pre-reinforced, three rows of drill holes are arranged in a cross shape, and the angle of the drill holes is adjusted to control the position of the final hole to achieve an effective distance of multiple points and multiple surfaces reinforcement.

[0011] 2) The drill hole is drilled deep into the area 5m above the top of the mining face to form a plum blossom shape for reinforcement. The grouting material is 525# cement and the corresponding proportion of XPM nano perfusion agent is added for consolidation. No shrinkage, 5s coagulation, water reduction rate of 37%, high stone strength, compressive strength can be increased by 200%-300%, non-toxic, harmless, and non-polluting performance characteristics.

[0012] 3) Set the grouting station at a distance of 15-30m from the working face before construction, and arrange a 2TGZ-60 / 210 drilling rig, a mixer...

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Abstract

A method for using deep hole pre-grouting to reinforce a top plate includes: arranging three rows of drilling holes in a cross manner according to a pre-reinforcing range, allowing the drilling holes to extend deeply into an area 5m above the top of a recovery face so as to form plum blossom reinforcement, selecting 525# cement as grouting material, adding corresponding proportion of XPM nano grouting agent for solidification, using grouting plugs for hole sealing, grouting once every 5m of drilling, and allowing grouting final pressure to be 2-5Mpa. By the method, safety of recovery of a working face is increased.

Description

technical field [0001] The invention relates to a method for reinforcing the roof by grouting in an underground coal mining face of a coal mine. Background technique [0002] In the existing scientific research results, there are two main methods of coal side reinforcement in large mining height working faces: bolting reinforcement and grouting reinforcement. Among them, the coal side grouting reinforcement technology has attracted much attention due to its good control effect, quick effect, safe construction, and ability to not affect production. The grouting reinforcement technology can be divided into cement grouting and polymer material grouting according to the grouting material; according to the grouting depth, it can be divided into deep grouting and shallow grouting. At present, most mines adopt single liquid shallow cement slurry and polymer double liquid shallow grouting technology. However, due to the small diffusion radius of cement slurry, long initial setting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
Inventor 折俊杰
Owner 折俊杰