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Impulse-type grouting method

A pulsed, grouting technology, applied in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve problems such as failure to achieve grouting effect, small diffusion radius of slurry, etc., to improve filling rate, low construction requirements, strong The effect of practicality

Active Publication Date: 2015-05-20
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cracks filled are only some of the cracks near the grouting pipe, and there is little or no grout in the farther rock mass, which will lead to a small diffusion radius of the grout and fail to achieve the expected grouting effect

Method used

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Embodiment Construction

[0016] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

[0017] Pulse type grouting method of the present invention: concrete steps are as follows:

[0018] a. Including arranging the grouting drilling at the design depth in the surrounding rock grouting area, and cleaning the water and residue in the hole;

[0019] b. Insert a grouting pipe 1 equal to the depth of the drilled hole into the constructed grouting borehole, the inner end of the grouting pipe 1 contacts the bottom of the hole, the outer end is connected with the grouting hose 4 through the control valve 3, and the hole is sealed with conventional Cement 2 is used for sealing;

[0020] c. Connect the pulse grouting system on the grouting hose 4, and set the flow meter 13 at the outlet of the pulse grouting system; the pulse grouting system includes a reversing valve 12, which is respectively connected to The high-pressure liquid outlet circuit ...

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Abstract

The invention discloses an impulse-type grouting method, and is applicable to general tunnel and roadway support projects. A grouting pipe with the same depth of a drilling hole is inserted into a well-constructed grouting drilling hole, the inner end of the grouting pipe contacts a hole bottom, and the outer end of the grouting pipe is connected with a grouting flexible pipe through a control valve. An impulse-type grouting system is connected on the grouting flexible pipe. A reversing valve ensures that high-pressure thick liquid and low-pressure thick liquid alternatively pass through, and therefore impulse-type grouting is achieved. As grouting time increases, the injecting speed of thick liquid is reduced, changes of a displayed value on a flow meter is observed, and when the thick liquid stops to flow, grouting is stopped. Impulse pressure is utilized to ensure that the thick liquid is provided with larger flow velocity and impact force; the width of an original cranny gap of a rock mass is enlarged, the closed cranny gap is opened, and therefore the number of channels for the thick liquid to pass through is increased, and strong permeation effect is generated; and the diffusion radius of the thick liquid is enlarged to improve filling rates of the gap.

Description

technical field [0001] The invention relates to a pulse type grouting method, in particular to a pulse type grouting method suitable for water blocking and reinforcement of weak rock masses in underground engineering construction. technical background [0002] During the construction or use of underground projects such as roadways and chambers, when encountering aquifers or high ground pressure, the affected rock mass will be relatively weak, which will easily lead to deformation and local collapse of surrounding rocks, threatening personnel, Equipment safety, delaying normal production. The grouting method is commonly used at home and abroad to block water and strengthen surrounding rocks to solve such problems. Grouting refers to the use of air pressure, hydraulic pressure or electrochemical principles to uniformly inject grout into the formation through the grouting pipe. The grout is filled, infiltrated and compacted to drive away the water and air in the soil particles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/38
Inventor 许兴亮张农田素川孙康周斌孙成才
Owner CHINA UNIV OF MINING & TECH
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