Subway tunnel ballast bed segment post-wall grouting method

Abstract

The invention relates to a subway tunnel ballast bed segment post-wall grouting method. The subway tunnel ballast bed segment post-wall grouting method comprises a grouting step and a sealing step. The grouting step specifically comprises the steps that a grouting hole is formed in a ballast bed, a grouting pipe is inserted into the grouting hole, and grouting is performed in the grouting pipe. The sealing step specifically comprises the steps of cutting a ballast bed around a grouting hole to a segment below the ballast bed, cutting off one part located on the outer side of the segment, of the grouting pipe, filling one part located in the segment, of the grouting pipe with double-fast cement or inserting a sealing plug, forming an annular third groove in the periphery of the grouting hole in the segment, placing an annular elastic sealing ring in the third groove; arranging a sealing plate on the elastic sealing ring, fixing the sealing plate to the segment through chemical bolts, and filling and leveling up the cut part on the ballast bed with a filler. Compared with the prior art, the subway tunnel ballast bed segment post-wall grouting method has the advantages of being betterin sealing performance and the like.

Description

technical field [0001] The invention relates to a subway tunnel maintenance technology, in particular to a post-grouting method for a subway tunnel track bed segment wall. Background technique [0002] The subway is becoming more and more popular in various cities. Some cities are located on soft soil foundations. Soft soil foundations are rheologically weak strata with high water content, high void ratio, high sensitivity, and low strength. Due to the influence of factors such as the soil properties of the strata around the tunnel, ground settlement, surrounding building construction activities, and vibration loads during train operation, it is easy to cause uneven and differential settlement in the overall settlement of the operating tunnel. This kind of uneven settlement is likely to cause water leakage in the longitudinal and annular joints of tunnel segments, and the increase of water leakage will intensify the development of uneven settlement in tunnels, especially und...

AI Technical Summary

Problems solved by technology

This kind of uneven settlement is likely to cause water leakage in the longitudinal and annular joints of tunnel segments, and the increase of water leakage will intensify the development of uneven settlement in tunnels, especially under the subway track bed in shield tunnels The settlement disease behind the segment wall is more serious. If it is not dealt with in time, it will cause damage to the tunnel segment and threaten the operation safety of the subway

[0003] The existing method is to open a grouting hole on the ballast bed, grout behind the segment wall through the grouting hole, and then use the grout to block the grouting hole, but this method is risky, and mud gushing, sand gushing, and tunnel settlement are prone to occur later and deformation of the tunnel structure

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