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A method of grouting post-construction segment wall of a full-section shield tunnel in hard rock stratum

A technology of shield tunneling and grouting behind the wall, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc.

Active Publication Date: 2021-04-09
CHENGLONG CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Control quality problems such as ground subsidence, segment uplift, tunnel water seepage, and structural damage caused by insufficient post-grouting of the segment wall in hard rock formation construction

Method used

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  • A method of grouting post-construction segment wall of a full-section shield tunnel in hard rock stratum
  • A method of grouting post-construction segment wall of a full-section shield tunnel in hard rock stratum
  • A method of grouting post-construction segment wall of a full-section shield tunnel in hard rock stratum

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Experimental program
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Effect test

Embodiment Construction

[0048] like Figure 1 to Figure 6 Shown, be the method for grouting after the construction segment wall of a kind of full-section hard rock formation shield tunnel of the present invention, comprise the steps:

[0049] 1) Shield machine installation

[0050] First, determine the construction path of the shield tunnel in hard rock formation according to the design requirements, and select a shield machine of appropriate size, put the shield machine into the launch shaft for installation and positioning, and then test run the shield machine to check the work of the shield machine conditions, and do a good job of pre-construction preparations, so that the grouting platform 7 can be seamlessly connected with the shield machine, so that the two do not affect each other when they work, and at the same time, the effect of post-grouting on the segment wall is improved to meet the Construction of shield tunnels of different sizes;

[0051] Since the shield machine is designed in an i...

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Abstract

The invention discloses a method for post-grouting of a segment wall in the construction of a full-section hard rock stratum shield tunnel. Secondary grouting, secondary grouting between hoops and grouting inspection. The grouting process of the invention is simple, adopts synchronous grouting combined with secondary grouting to fill the wall behind the wall, reduces the loss of synchronous grouting, reduces the conflict between secondary grouting and shield tunneling, and ensures the smooth progress of shield construction. Control the quality problems such as ground subsidence, segment floating, tunnel water seepage, and structural damage caused by insufficient grouting after the segment wall in the construction of hard rock formations. Due to the reduction in the amount of double-liquid grouting in the secondary grouting, the grouting can be reduced. The cost and construction efficiency are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for grouting post-construction segment walls of shield tunnels in full-section hard rock formations. Background technique [0002] When excavating a shield tunnel, there will be a certain gap between the segment and the stratum. In order to control the settlement and stabilize the segment, it needs to be filled by grouting between the segment wall and the stratum. Therefore, grouting behind the wall has an important influence on the construction effect of shield tunneling. Excessive grouting pressure behind the wall may easily cause surface uplift. If the grouting pressure behind the wall is too small, incomplete or uneven grout filling will easily occur, resulting in segment misalignment, floating up, tunnel axis deviation, stress release of the bottom layer and increased settlement. At present, the general grouting is to mix a certain amount of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10E21D11/08E21D9/06
CPCE21D9/0607E21D11/08E21D11/105
Inventor 董建刚朱伟升龙昊温友炯李朝勋戴前继
Owner CHENGLONG CONSTR GROUP
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