Method for grouting behind segment wall in shield tunnel construction of full-section hard rock stratum

A technology of shield tunneling and grouting behind the wall, which is used in tunnels, tunnel linings, underground chambers, etc. to achieve the effect of improving stability and reliability

Active Publication Date: 2019-12-13
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 structur

Method used

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  • Method for grouting behind segment wall in shield tunnel construction of full-section hard rock stratum
  • Method for grouting behind segment wall in shield tunnel construction of full-section hard rock stratum
  • Method for grouting behind segment wall in shield tunnel construction of full-section hard rock stratum

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Experimental program
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Embodiment Construction

[0048] Such as 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 a...

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Abstract

The invention discloses a method for post grouting of a segment wall in shield tunnel construction of a full-section hard rock stratum. The method comprises the following steps of shield machine installation, grouting platform construction, synchronous grouting behind the segment wall, secondary grouting behind the segment wall, secondary grouting between hoops and grouting detection. According tothe method, the grouting process is simple in steps, synchronous grouting combined with the secondary grouting is adopted for wall back filling, the loss of synchronous grouting is reduced, the conflict between the secondary grouting and shield tunneling is lowered, the smooth progress of shield construction is ensured, the quality problems such as ground settlement, segment floating up, tunnel seepage and structure damage caused by the insufficient grouting behind the segment wall in the construction of the hard rock stratum are controlled, because the amount of double liquid slurry in the secondary grouting is decreased, thus the grouting cost is lowered, and the construction efficiency is 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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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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