Shield segment and application of shield segment to shield tunneling machine passing through mined tunnel in empty push mode

Abstract

The invention discloses a shield segment which comprises a segment body, a plurality of injected holes formed in the segment body in a pre-buried mode and used for supplying grouting channels and grouting bags arranged on the outer side of the outer wall surface of the segment body and used for being filled with grouting slurry so that after the grouting slurry is solidified, the gap between the segment body and a primary support can be filled to form effective support for the segment body; and after a shield tunneling machine passes through a mined tunnel section, gaps among all the grouting bags on the outer side of the segment body are filled through slurry injection into the injected holes, so that the interiors and exteriors of the grouting bags on the outer side of the segment body are densely filled with the slurry to form a water-insulating layer. The invention further discloses a construction method of the shield segment for a shield tunneling machine passing through a mined tunnel in an empty push mode. The grouting bags are arranged on the outer side of the segment body, so that the quick setting slurry is injected into the grouting bags during assembly to fill the gap between the primary support and a segment structure; and the injected holes are additionally formed in the segment structure, through the injected holes, the gaps between the grouting bags behind the segment wall are filled, and dense filling of the slurry behind the segment wall is ensured to form the effective water-insulating layer.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to a shield segment and the application of the shield tunnel through a mine tunnel. Background technique [0002] In recent years, the shield tunneling method has been widely used in railway, highway, municipal and other industries. When the shield machine partially passes through hard rock, boulder groups, or the upper soft and lower hard sections, it often uses the mining method to excavate first, and the shield machine then pushes through the method. [0003] Traditional shield tunneling is to spray pea gravel from the front of the cutter head (or segment grouting hole) to fill the gap between the segment and the initial support of the tunnel when the shield is advancing, and then grout from the segment grouting hole or directly behind the wall. Synchronous grouting is stable. For example, the patent document CN102425427A discloses a method and de...

AI Technical Summary

Problems solved by technology

The three-stage filling method of bean gravel spraying, synchronous grouting and ground hole grouting is adopted. The bean gravel transportation, screw conveyor loading and dry jetting are all mechanically constructed, which solves the defect of low construction efficiency in the existing construction methods and is widely used. Suitable for tunnel construction using mining method + shield construction method

[0004] However, the above solution cannot provide effective compaction force to the tunnel structure due to the combination of pea gravel and segment grouting, resulting in the joints of the segments being easily opened, making the waterproof gasket unable to waterproof due to insufficient compression, resulting in leakage

However, due to the good fluidity of the synchronous grouting method, the grout is easy to flow into the surrounding of the shield shell and the excavation cabin under the action of its own weight and pressure, and a cavity is often formed above the tunnel structure, which can neither provide a compacting force for the tunnel structure, nor can it be used in the initial stage. An effective waterproof layer is formed between the support and the segments

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