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Construction method for filling of back of fabricated secondary lining of concealed excavated tunnel

A construction method and prefabricated technology, applied in tunnel lining, tunnel, wellbore lining, etc., can solve the problems such as the infancy of the prefabricated secondary lining of the buried tunnel, and achieve the control of surface settlement, high safety, and enhanced waterproof ability. Effect

Inactive Publication Date: 2018-04-20
CHINA RAILWAY SIXTH GROUP +1
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  • Abstract
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  • Claims
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Problems solved by technology

At present, the domestic research on the prefabricated structure of subway shield tunnels is relatively mature, but the research on the prefabricated secondary lining of underground excavation tunnels is still in its infancy

Method used

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  • Construction method for filling of back of fabricated secondary lining of concealed excavated tunnel
  • Construction method for filling of back of fabricated secondary lining of concealed excavated tunnel
  • Construction method for filling of back of fabricated secondary lining of concealed excavated tunnel

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Embodiment Construction

[0024] The construction method for filling behind the assembly type secondary lining of the main line of the underground excavation section of the subway provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Components that are the same as those in the prior art are given the same reference numerals, and their descriptions are omitted.

[0025] Now take a certain underground excavation section project of a subway as an example to illustrate: figure 1 As shown, the second lining structure in this section has a horseshoe-shaped cross-section, which is assembled from the first to sixth prefabricated segments. There is a gap between the prefabricated segments and the primary support structure of the main line, which needs to be back filled.

[0026] Such as Figure 1-5 As shown, the method for filling the back of the main line of the underground excavation section of the subway provided by this ...

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Abstract

The invention relates to a construction method for backfilling of an assembled secondary lining of a submerged tunnel, which belongs to the technical field of rail transit engineering construction. It is characterized in that: after the assembly of each ring segment is completed, the bean-gravel construction is carried out in the gap between the back of the prefabricated segment and the primary support structure of the main line; the order of the bean-gravel filling is from bottom to top, left and right symmetrical; Install an airbag seal at the end of the pipe ring. The airbag seal is inflated and pushed against the wall of the cave. When the equipment moves forward, the airbag deflates, and the mounting seat drives the airbag forward; after assembling 20 rings, the ring is prefabricated with cement slurry The bean gravel gaps filled behind the segments are fully filled to form a closed ring. When grouting, grout is injected vertically through the holes, and one hole is injected every five rings; the ring is sealed once every 20 rings, and the ring is sealed by chemical grouting. The invention can control the subsidence of the ground surface, enhance the waterproof ability of the assembled tunnel, prevent the segments from floating up and sideways, and is convenient for construction, high in safety, short in construction period and low in cost.

Description

technical field [0001] The invention belongs to the technical field of rail transit engineering construction, and in particular relates to a construction method for filling the gap between the back of the prefabricated segment and the primary support structure of the main line, which is applied to the tunnel constructed by the assembled second lining in the underground excavation section of the subway . Background technique [0002] Existing data show that submerged tunnel assembly structures have been implemented and applied in Japan and the Soviet Union. At present, the domestic research on the prefabricated structure of subway shield tunnels is relatively mature, but the research on the prefabricated secondary lining of underground excavation tunnels is still in its infancy. Domestic tunnel mechanization is mainly reflected in shield tunneling and TBM (applicable to rock strata) tunnel construction technology. Its outstanding feature is the use of prefabricated segment c...

Claims

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Application Information

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IPC IPC(8): E21D11/38E21D11/08E21D11/10
CPCE21D11/08E21D11/10E21D11/386
Inventor 王一李宝文孟祥友任建胡伟李嵩李东赵婷婷徐小龙魏凤东马雪松
Owner CHINA RAILWAY SIXTH GROUP
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