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External-flat-type high-pressure rotary jet grouting device for complex formations in underground coal mines and method

A technology of complex strata and high-pressure jet spraying, which is applied in earthwork drilling, wellbore/well components, drilling with liquid/gas injection, etc. It can solve the problems of difficult hole formation, poor stability of the borehole wall, and easy drill sticking, etc. problems, to achieve the effect of increasing the consolidation rate, reducing or accidents in the hole, and reducing the upward return

Active Publication Date: 2020-01-03
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects and deficiencies in the prior art, the present invention provides an external flat type high-pressure jet grouting device and method for complex underground strata in coal mines, which solves the problem of poor stability of borehole walls and difficulty in forming holes in complex and broken strata in underground coal mines. , Easy to stick drill and other problems

Method used

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  • External-flat-type high-pressure rotary jet grouting device for complex formations in underground coal mines and method
  • External-flat-type high-pressure rotary jet grouting device for complex formations in underground coal mines and method
  • External-flat-type high-pressure rotary jet grouting device for complex formations in underground coal mines and method

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Embodiment 1

[0055] Such as Figure 1 to Figure 9 As shown, this embodiment provides an outer flat type high-pressure jet grouting device for complex underground formations in coal mines, which includes an outer water pipe 1, a middle joint 2, a lower outer pipe 3, a drill joint 4 and an outer pipe connected coaxially in sequence. A flat drill bit 5; a special-shaped piston 6 that can move axially is arranged in the water-passing outer pipe 1, and the inner space of the water-passing outer pipe 1 between the end of the special-shaped piston 6 and the end of the middle joint 2 is an expansion chamber 7, and the expansion chamber 7 is provided with a nozzle 8 on the side wall of the outer water pipe 1; a limit spring 9 is arranged between the end of the special-shaped piston 6 and the middle joint 2; The first flow passage 1-1 along the axial direction provided on the pipe wall of the pipe 1 and the second passage 2-1 passing through the axial direction provided on the middle joint 2 are bot...

Embodiment 2

[0064] This embodiment also provides a construction method of an outer flat high-pressure jet grouting device for complex underground coal mine formations, including the following steps:

[0065] a. Construction preparation steps: configure the corresponding drilling fluid according to the properties and characteristics of the destination layer, adjust the performance indicators to meet the requirements; configure the cement slurry with a certain water-cement ratio, and it is required to have fast solidification speed and high solidification strength. characteristic;

[0066] b. Installation steps of the device: Insert the special-shaped piston into the outer pipe of the water, connect the limit spring and the middle joint in sequence, put the quantitative expansion agent into the expansion chamber, connect the elbow to the middle joint and ensure that the central axis of the lower end of the elbow is in the middle of the device as a whole The axes are consistent, and then con...

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Abstract

The invention discloses an external-flat-type high-pressure rotary jet grouting device for complex formations in underground coal mines and a method. The external-flat-type high-pressure rotary jet grouting device includes a water-passing outer pipe, a middle joint, a lower outer pipe, a drill bit joint and an external-flat-type drill bit which are coaxially connected in order; a special-shaped piston capable of moving axially is arranged in the water-passing outer pipe, and an expansion cavity with a nozzle is formed between the end of the special-shaped piston and the end of the middle joint; a limiting spring is arranged between the end of the special-shaped piston and the middle joint; an axial channel, a first flow channel and a second flow channel between the water-passing outer pipeand the special-shaped piston are in sealed communication; a quick-setting box is arranged in the lower outer pipe, an elbow pipe communicates between the second flow channel and the quick-setting box, and a hole is forming in the side wall of the elbow pipe to communicate with a first cavity; and a first unidirectional jet nozzle and a second unidirectional jet nozzle arranged in the first cavity and a second cavity separately are further included. By adopting the device and the process method, the function of rotary jet grouting to improve the complex and broken formations in the underground coal mines can be fully exerted, the wall can be effectively protected against collapse, the formations can be strengthened, and the occurrence of accidents in the holes can be reduced or avoided.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and in particular relates to an outer flat type high-pressure rotary jet grouting device and method for complex underground strata of coal mines. Background technique [0002] my country is a big coal mining country, and more than 95% of the coal mines are underground mining. The complex geological conditions of the coal seam not only limit the production capacity of the mine, the length of the mining area, and the length of the coal mining face, but also cause difficulty in mining and low driving efficiency. and other problems, and brought serious disasters to coal mine safety production, among which underground gas disaster is one of the most serious disasters in my country's coal mine safety production, and with the expansion of coal mining range and the increase of coal mining depth, some low gas mines Gradually transformed into a high-gas mine, making the situation of coal mine safety...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B7/18
CPCE21B7/18E21B33/13
Inventor 杨冬冬李泉新刘建林赵江鹏王四一
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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