A Limiting Method to Prevent the Displacement of Empty Pushing Segment in Shield

Abstract

The invention discloses a method for preventing duct piece displacement in the no-load shield tunneling process. The method comprises the following steps that (a) a through hole is formed in a duct piece; (b) a single inlet channel bag-shaped body is plugged into a gap from the through hole; (c) the bag-shaped body is filled with cement slurry by using a grouting machine, and the bag-shaped body expands and is in contact with the duct piece and a preliminary bracing system; (d) after grouting is completed, an inlet channel and the grouting machine are separated; (e) the cement slurry solidifies for forming. By applying the method, the bag-shaped body is plugged into the gap between the duct piece and the preliminary bracing system and is filled with the cement slurry to be supported between the duct piece and the preliminary bracing system and play a duct piece limiting and supporting role. The method is simple in process and good in operability, the consumed working time is short, the cost is low, an implementation effect is good, a hoisting hole or a grouting ole can be closed after implementation, follow-up work is omitted, and popularization is promoted.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a position-limiting method for preventing the displacement of shield tunneling segment segments. Background technique [0002] When using the shield tunneling method to excavate the tunnel, the mining method is generally used to excavate the tunnel section first, and the shield machine needs to advance along the tunnel section under no load, and erect the segments forming the tunnel ring during the advancement process (the existing commonly used pipe The wall thickness of the segment is 300mm-500mm), there is a gap between the segment and the initial support system in the tunnel section (controlled according to the tunnel design, such as filling and plugging a large pit when constructing the initial support system, the gap is controlled to be the largest The spacing is generally 150mm-350mm), which needs to be filled with grouting. Before grouting, the assembled segment rings will ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem existing in the prior art that when the ejector rod is used to support the segment, the ejector rod is more convenient to install, but the subsequent removal is troublesome, and the segment supported by it is locally stressed, preventing the The displacement effect of the sheet is poor, and the cost of the ejector pin is high; when the method of blowing and filling pebbles backward in the gap is adopted, the operation is complicated, the filling amount is large, and the above-mentioned shortcomings affect the overall construction progress. Limiting method for supporting segment to prevent displacement of segment when empty push of shield machine

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