Shield tunnel segment leakage point identification method

Abstract

The invention discloses a shield tunnel segment leakage point identification method. The method comprises the following steps: coating or filling an indicator at a joint part of adjacent segments and a bolt hole for connecting the adjacent segments; after the duct piece is installed, water attached to or dripped from the inner wall of the duct piece is sampled; analyzing the concentration of the indicator ions contained in the water sample, and if the concentration of the indicator ions in the sample exceeds a preset value, judging that the leakage risk exists in the area where the corresponding sampling point is located. According to the shield tunnel segment leakage point identification method provided by the invention, only the collected water sample needs to be tested, the channel with leakage can be preliminarily judged according to the detected ion type, the leakage part can also be judged according to the difference of different ion concentrations obtained through sampling, and the precision is relatively high.

Description

technical field [0001] The invention relates to the technical field of water seepage identification of shield tunnel segments, in particular to a method for identifying seepage points of shield tunnel segments. Background technique [0002] Among all urban tunnels, the construction of underwater large-diameter shield tunnels is the most difficult. In particular, large-diameter shields encounter water leakage, which is extremely difficult to deal with, and the construction is difficult, and water leakage at the same leakage point is likely to occur repeatedly. Whether the water leakage point can be identified accurately and quickly will directly affect the construction cost of the project. [0003] Generally speaking, the larger the ring width of the lining, the fewer the tunnel ring joints within the same mileage, and the lower the probability of water leakage. The fewer the segments of the ring lining, the fewer the longitudinal seams and the lower the probability of wate...

AI Technical Summary

Problems solved by technology

The operation of this technology is relatively simple and convenient, but because it relies too much on the dark lighting and location of the photo imaging, there are certain errors in the obtained results, which need to be constantly corrected

At the same time, the realization of this technology requires the leakage of water in the tunnel to form a certain scale, such as a large area of ​​wet stains on the segment, it is difficult to accurately identify small-scale leakage

Images