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Super-long span tunnel excavation and support construction method

A tunnel excavation and construction method technology, which is applied in the direction of tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of high safety risks, slow construction progress, and many temporary supports, and achieve safe and reliable construction, less process change, and construction large space effect

Active Publication Date: 2018-06-08
CHINA RAILWAY NO 5 ENG GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only has a small cross-section of the pilot pit, and cannot use large-scale machinery for construction, but also has many overlapping procedures, slow construction progress, and many temporary supports. When the temporary supports are removed, the surrounding rock deformation is large and the safety risk is high.

Method used

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  • Super-long span tunnel excavation and support construction method
  • Super-long span tunnel excavation and support construction method
  • Super-long span tunnel excavation and support construction method

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Embodiment Construction

[0058] Please also see Figure 1-Figure 4 , The present embodiment provides a construction method for excavation and support of a super-long-span tunnel. The surrounding rock of the super-long-span tunnel is V-level strongly weathered granite, and the excavation section is 19.7m high and 32.7m wide. In this embodiment, according to the principle that the horizontal and vertical directions are basically uniform, the large-section tunnel is divided into eleven parts for construction. The eleven parts include the left hole B on the top floor, the middle hole A on the top floor, and the right side of the top floor from top to bottom and from left to right. Hole C, hole D on the left side of the middle step, core soil H in the middle part of the middle step, hole E on the right side of the middle step, hole F on the left side of the lower step, core soil I in the middle part of the lower step, hole G on the right side of the lower step, left inverted arch J and right inverted Arch ...

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Abstract

The invention relates to a super-long span tunnel excavation and support construction method. The method comprises the steps of top hole advancing, stratified excavation, core reservation and key anchoring; according to the principle that the transverse direction and the vertical direction are basic uniform, the super cross-section tunnel is divided into eleven parts to be excavated, and a top layer middle hole is dug; all parts on the two sides are excavated in a left-right alternate and stratified mode from top to bottom, and initial support is conducted after each part is excavated; finallycore soil and an inverted arch are excavated gradually by layers, and a closed ring support system is formed. The method has the advantages of being simple in construction method, less in in processtransformation, safe and reliable in construction, high in degree of mechanization and capable of organizing safe and rapid construction.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for excavation and support of super-large-span tunnels, and in particular to a construction method for excavation and support of underground station tunnels with a span greater than 25m. Background technique [0002] Due to the large excavation section and flat shape of ultra-long-span tunnels (usually spans greater than 25m), the overall stability of the surrounding rock is worse than that of ordinary sections, which increases the difficulty of tunnel construction deformation and stability control. . How to choose the correct excavation support method, ensure the safety of the construction process and control the deformation of surrounding rock are the keys to the success of tunnel construction. [0003] For ultra-long-span tunnels, construction methods such as CD method, CRD method, double-side wall pilot pit method and multiple pilot pit meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10E21D20/00
CPCE21D9/00E21D11/105E21D20/00
Inventor 肖承倚蒋思罗都灏段仕军代龙震彭宇峰周海华董显苇李雅筠
Owner CHINA RAILWAY NO 5 ENG GRP
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