Sandy wall rock grouting strengthening method in subsurface excavation construction

A grouting reinforcement and grouting technology, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of quicksand, collapse, and sand leakage in the excavation surface of the sand layer, and achieve low grout loss, strong permeability, The effect of speeding up the construction progress

Inactive Publication Date: 2010-12-08
THE FIFTH ENG CO LTD OF CHINA TIESIJU CIVIL ENG GRP
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Problems solved by technology

[0004] The purpose of the present invention is to provide a grouting reinforcement method for sandy surrounding rock in underground excavation construction, to solve the problems of sand leakage, quicksand and collapse of the excavation surface of the sand layer in the construction of undergrou

Method used

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  • Sandy wall rock grouting strengthening method in subsurface excavation construction
  • Sandy wall rock grouting strengthening method in subsurface excavation construction

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Embodiment

[0060] The section of the submerged tunnel between XX Station and XX Station of XX Subway Line 1 is all located in the sand layer, and the sand layer is rich in water. The invention was adopted in the underground excavation construction process of the subway tunnel, and successfully overcome the difficult problems of underground excavation tunnel construction in sandy strata such as tunnel collapse, vault sand loss, and arch foot quicksand. The project started in April 2006 and was completed in July 2007 The excavation was successfully completed.

[0061] The construction process is as follows:

[0062] The diameter of the grouting pipe is 42mm, and the length is 1.5m. Drill 28 holes in the pipe body in a plum blossom shape with a drilling machine. The front end of the grouting pipe is processed into a cone shape, and the tapered part is filled with cotton yarn.

[0063] After the grille is installed, install the grouting pipe. The grouting pipe is positioned by marking it wi...

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Abstract

The invention relates to a sandy wall rock grouting strengthening method in subsurface excavation construction, comprising the following steps of: installing a grate; installing a grouting pipe; and grouting, wherein the grouting pipe is installed by adopting a sand blasting pore-forming method; after the grate is completely installed, and then an air pressure gun with high pressure of 0.8 MPa is adopted for sand blasting pore-forming; one end of the air pressure gun is connected with high pressure air, and the other end is slowly inserted into a sand layer along the installation position of the grouting pipe to blast pores; after pore blasting width achieves the length of the grouting pipe, the air pressure gun is fast extracted, the grouting pipe is immediately inserted, and the tail part of the grouting pipe is spot-welded on the grate for fixation; grouts are grouted into the grouting pipe by using a grouting pump, blended grouts are delivered into a grouting tank by using a high pressure air grouting process. The invention solves the problems of sand leakage, sand drifting and collapse of a sandy layer excavation surface in the subsurface excavation construction, ensures the excavation construction safety and the peripheral environment safety and has the advantages of stable construction quality, effective control of a grouting range, small grout loss amount, reliable construction quality and simple construction method.

Description

technical field [0001] The invention relates to a grouting reinforcement method for sandy surrounding rocks in underground excavation construction, in particular to a method for advance grouting reinforcement for surrounding rocks in underground excavation construction in sandy strata. Background technique [0002] In modern engineering construction, with the advancement of science and technology, the society's requirements for construction safety, environmental protection, and energy conservation are increasing day by day. Underground excavation construction is widely used in the development and construction of tunnels and underground spaces due to its advantages such as less pollution during construction, no change to the surface environment, no interruption of ground social and economic activities, and strong applicability. [0003] When the underground excavation method is used for construction in weak or loose surrounding rocks, the surrounding rocks are first pre-reinf...

Claims

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Application Information

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IPC IPC(8): E21D11/10
Inventor 王福恩孙爱军程贤红杜春生王小庆鲍俊捷吴海红
Owner THE FIFTH ENG CO LTD OF CHINA TIESIJU CIVIL ENG GRP
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