Oversized variable cross section tunnel supporting structure

A support structure and variable section technology, which is applied in tunnels, tunnel linings, shaft linings, etc., can solve problems such as unsuitable control of vault deformation, large arch foot sinking, and poor stability, so as to reduce the risk of temporary vertical bracing and speed up construction progress, usage reduction effect

Active Publication Date: 2015-03-11
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

However, tunnels with such a large span in this project are extremely rare, and there is little experience to learn from, and they are located at the entrance of the tunnel. Most of the rocks on the surface of the mountain are extremely wea

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  • Oversized variable cross section tunnel supporting structure

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[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments of the description:

[0014] The present invention provides a super-large variable-section tunnel support structure, which includes a dome 11 at the top, an inverted arch 12 at the bottom, side walls 13 on both sides, and a guide hole on the outside of the side walls 13 along the tunnel ring. There is an inner layer of secondary lining 2, the outer side of the secondary lining 2 of the side walls 13 on both sides are provided with the initial support 42 of the pilot hole along the radial direction of the tunnel, the initial support 42 of the pilot hole and the secondary lining of the side walls 13 on both sides. There is a boot-shaped large wall foot 41 between 2, the outer surface of the secondary lining 2 of the vault 11 and the secondary lining 2 of the inverted arch 12 is provided with initial support 31 along the radial direction of the tunnel...

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Abstract

The invention provides an oversized variable cross section tunnel supporting structure. Along the ring shape of a tunnel, the oversized variable cross section tunnel supporting structure comprises a top arch crown, a bottom inverted arch, side walls on the two sides and pilot tunnels on the outer sides of the side walls. The oversized variable cross section tunnel supporting structure comprises a secondary lining of an inner layer in the radial direction of the tunnel. Pilot tunnel primary supports are arranged on the outer sides of secondary linings of the side walls on the two sides, boot-shaped large wall feet are poured between the pilot tunnel primary supports and the secondary linings of the side walls on the two sides, primary supports are arranged on the secondary lining of the arch crown and the surface of the outer side of the secondary lining of the inverted arch in the radial direction of the tunnel, an inner layer primary support is arranged between the secondary lining of the arch crown and the primary supports, the primary support of the arch crown and the inner layer primary support are supported on the boot-shaped large wall feet, and the primary support of the inverted arch is supported on the pilot tunnel primary supports. The oversized variable cross section tunnel supporting structure solves the problem of insufficiency of the soft foundation bearing capacity better and provides a stable foundation for an upper structure.

Description

technical field [0001] The invention relates to the field of super large section tunnel construction, in particular to a super large variable section tunnel support structure. Background technique [0002] With the development of tunnel engineering, the support scheme of super-large cross-section tunnels has made great progress. However, in general, composite linings based on the new Austrian method are basically used, and bolts are used as initial support, and formwork concrete is used as secondary lining. The stiffness is different, for example, the length of the bolt, the thickness of the shotcrete, the change of the form of the steel frame, whether to add steel fibers, the change of the thickness of the formwork concrete, the change of the concrete label and so on. For such a large-span tunnel in this project, it is extremely rare, and there is little experience for reference, and it is located at the entrance of the mountain. Most of the rocks on the surface of the mou...

Claims

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Application Information

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IPC IPC(8): E21D11/00E21D11/10E21D11/14E21D21/00
CPCE21D11/00E21D11/10E21D11/14E21D21/00
Inventor 龚彦峰江胜林徐向东李树鹏张俊儒焦齐柱隗建波颜志伟孙文昊王春梅郭海满洪军陈利杰
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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