Segment lining grouting system and method based on outer-embedding-type channel and expandable bag

Abstract

The invention relates to a segment lining grouting system and method based on an outer-embedding-type channel and an expandable bag. The segment lining grouting system comprises a tunnel structure formed by splicing segment lining, wherein a grouting hole serving as a hoisting hole is embedded in the central part of the segment lining, a transverse and longitudinal outer-embedding-type channel isarranged on the outer arc surface of the segment lining, a slurry diffusion main channel is arranged along the segment circumferential direction, a slurry diffusion secondary channel is arranged in the tunnel longitudinal direction, and the slurry diffusion main channel is connected with the grouting hole; and the outer-embedding-type channel adopts a embedded channel which is internally providedwith the bag with high extensibility, and the slurry injected through the grouting hole can only flow within the limited range of the bag. The segment lining grouting system and method have more obvious significance for water-rich and large-particle pebble soil layers, the defect that slurry corresponding to the conventional grouting process is diluted or lost to surrounding loose stratum by underground water under the condition of stratum overbreak or disturbance can be effectively overcome, the effective filling of the three-dimensional annular space of a shield tail gap is realized, the effective contact between a tunnel and the surrounding stratum is ensured, and the stability of the tunnel structure and the safety of the surrounding environment are realized.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a segment lining grouting system and method based on an externally embedded channel and a stretchable bladder. Background technique [0002] For the current underground tunnel projects in major cities in China, due to the geological structure and human activities, there are formation particles of different particle sizes and certain pressure groundwater in the formation, so shield excavation will form shield tail voids of different shapes and irregular distribution. After the grout under conventional grouting process conditions is injected into the shield tail gap, before the grout solidifies, it is easily diluted by groundwater, taken away by flowing groundwater, and the grouting site in some areas, resulting in grout loss and surrounding loose formations, shield The tail void cannot be effectively filled, especially in the vault area of ​​the tunnel. Unde...

AI Technical Summary

Problems solved by technology

Based on the characteristics of the stratum and the current level of grouting technology for shield tunnels, the conventional grouting process cannot meet the requirements for effective filling of the three-dimensional annular space in the shield tail gap, which is not conducive to the stability of the tunnel structure and the protection of environmental safety, and is not conducive to the control of project investment. With the increasing scale of shield tunneling projects across the country, the disadvantages of conventional grouting technology are becoming more and more obvious

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