Method for large-diameter shield tunnel segment monitoring cable to pass through second lining

Abstract

The invention provides a method for large-diameter shield tunnel segment monitoring cable to pass through a second lining, on the premise that the second lining is subjected to staged pouring construction, before pouring of backfilled concrete on the two sides of an opening piece, the cable penetrates through the backfilled position of the opening piece through a support and a cable guide groove and is fixed to a specific position, so that a sensor cable is wound out to the outer side of the second lining concrete steel formwork, after second lining concrete is poured, the cable is fixed to the surface of the second lining concrete, and cable fixing is completed. Holes can be prevented from being formed in the second lining concrete structure, the overall influence on the second lining concrete structure is reduced, and meanwhile the probability of water leakage of the pipeline is reduced. By means of the method, monitoring can be conducted in all stages before secondary lining concrete pouring, in pouring and after pouring, the monitoring interruption time is short, and the continuity of the monitoring time is guaranteed. The whole cable can be connected to the acquisition instrument at a time, cable joints are reduced, and signal loss caused by the cable joints is avoided.

Description

technical field [0001] The present invention relates to the technical field of tunnel engineering, in particular to a method for monitoring cables passing through a second lining in a large-diameter shield tunnel segment, which is used for large-diameter shield tunnels and is designed to be used for the structural health of tunnels with a second lining structure. monitoring technology. Background technique [0002] The tunnel construction of the shield method adopts the shield machine to excavate, the cutter head cuts the stratum in front, and the segment is installed in the shield for support. [0003] Large-diameter shields are generally designed with cast-in-place secondary concrete structures, collectively referred to as secondary linings. [0004] The construction process of the large-diameter shield is as follows: factory prefabricated concrete segments—transport and install the segments to the tunnel site—cast the second lining in-situ. [0005] Large-diameter shiel...

AI Technical Summary

Problems solved by technology

[0007] According to the technical problem that the installed sensor cable will be affected by the second lining structure when the existing large-diameter shield segment structure health monitoring is proposed above, a kind of large-diameter shield tunnel segment monitoring cable passing through the second lining is provided. method

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