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Fixed-point pressurizing and diffusing method and fixed-point pressurizing and diffusing structure for kerf grouting and hole sealing

A technology of grouting and hole sealing, which is applied in the directions of earthwork drilling, sealing/seal, gas discharge, etc. It can solve the problems of insufficient grouting in the sealing space of gas drainage drilling holes, so as to improve the quality of hole sealing and increase the The effect of the gas extraction effect

Active Publication Date: 2018-08-28
CHINA COAL TECH ENG GRP CHONGQING RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, in order to solve the problem of loose grouting in the plugging space of gas drainage boreholes using the slotting grouting sealing method, the present invention provides a slotting grouting sealing fixed-point pressurized seepage expansion method and structure , improve the fluidity of the grout, increase the pressure of the grout in the hole and the range of diffusion and penetration during grouting, in order to completely fill the slot space, and seal the cracks around the borehole, so as to improve the quality of the hole sealing and the effect of gas drainage. Purpose

Method used

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  • Fixed-point pressurizing and diffusing method and fixed-point pressurizing and diffusing structure for kerf grouting and hole sealing
  • Fixed-point pressurizing and diffusing method and fixed-point pressurizing and diffusing structure for kerf grouting and hole sealing

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Embodiment 1

[0029] Such as figure 1 As shown, a slotted grouting sealing hole fixed-point pressurization expansion method includes the following steps:

[0030] Step 1: According to the slotting grouting sealing design parameters, use ultra-high pressure hydraulic slotting equipment to carry out gas drainage drilling construction on the pre-mined coal seam 13. The diameter of drilling 1 is 113mm, and the sealing length is 20m. Cut a total of two circular slots 4 at 15m and 8m, clean the cinder scum in the hole and prolong the cleaning time for 2 minutes;

[0031] Step 2: According to the number and position of the designed annular slot 4, install and fix the corresponding number of pressurized expansion airbags 8 on the corresponding positions of the extraction pipe 2 and the annular slot 4, connect the pressurized expansion airbag 8 to the rubber hose 5, and pull Extend to the orifice, and arrange the rear end plug 3 on the extraction pipe 2;

[0032] Step 3: Send the extraction pipe 2...

Embodiment 2

[0047] Such as figure 2 , the difference with Embodiment 1 is that in this embodiment, the number of the annular slot 4 and the supporting pressurized inflation air bag 8 is one. Of course, in other embodiments, the number can also be three, as long as the drilling can be ensured. The fluidity of the inner grout, and the pressure and diffusion and penetration range of the grout in the hole can be guaranteed during grouting.

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Abstract

The invention discloses a fixed-point pressurizing and diffusing method and a fixed-point pressurizing and diffusing structure for kerf grouting and hole sealing. According to the method, gas extraction drilling is conducted based on kerf grouting and hole sealing, pressurizing and swelling airbags are fixed to specific positions of extraction tubes during preparation of hole sealing and are sentto in-hole seam and groove positions, and grouting and hole sealing are conducted. Through airbag pressure adjustment, the airbags are pressurized to swell, radial thrust is provided for in-hole slurry flowing, seam and groove spaces are filled with slurry, and the spreading and infiltrating range of the slurry is widened. Fixed-point pressurization and diffusion are realized in sealed spaces to seal gaps around drill holes. By the method, compacting of the in-hole sealing slurry is benefited, and internal cracks of hole sealing materials are reduced. By the method and the structure, the spreading and infiltrating range of the grouting slurry can be widened effectively, quality of kerf grouting and hole sealing can be improved, gas extraction concentration and extraction rate can be increased, and accordingly, high on-site promotion and application value are realized.

Description

technical field [0001] The invention belongs to the technical field of drilling and sealing holes for gas drainage in coal mines, and in particular relates to a method and structure for slotting, grouting, sealing holes, fixed-point pressurization and infiltration expansion, and is especially suitable for drilling and sealing holes for bedding gas drainage. Background technique [0002] my country is the largest producer and consumer of coal resources. In addition, my country's industrial energy structure determines that the development and utilization of coal resources will still play a fundamental and leading role in promoting the process of industrial economic development in the future. However, due to the complex geological and environmental conditions of coal resources in my country, coal mine safety accidents are prone to occur in the process of coal mining, especially the number of coal and gas outburst accidents ranks first in the world. As the mining depth increases...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B33/13
CPCE21B33/13E21F7/00
Inventor 国林东赵旭生孙海涛戴林超王波曹偈杨慧明张永将黄振飞兰祥云朱墨然
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST