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Supporting structure of extra-large cross-section loess tunnel and construction method thereof

A technology for loess tunnels and extra-large cross-sections, applied in the field of tunnels, which can solve problems such as narrow construction space, numerous construction steps, and slow construction progress, and achieve the effects of simple construction procedures, convenient large-scale mechanical operations, and large excavation space

Inactive Publication Date: 2010-12-08
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the side wall pilot tunnel method can effectively control settlement, there are many construction steps, narrow construction space, slow construction progress, and high project cost. Especially for the construction of long-distance and super-large-section loess tunnels, it is necessary to achieve safe and rapid , economical construction, must adopt appropriate support structure measures and reasonable excavation methods

Method used

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  • Supporting structure of extra-large cross-section loess tunnel and construction method thereof
  • Supporting structure of extra-large cross-section loess tunnel and construction method thereof
  • Supporting structure of extra-large cross-section loess tunnel and construction method thereof

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] see figure 1 , the present invention includes initial support 2, secondary lining 3 of the arch wall, and inverted arch 4, and a small conduit advance support 1 is arranged along the contour line of the arch of the tunnel, and is arranged between the initial support 2 and the secondary lining 3 of the arch wall There is a waterproof layer.

[0025] The initial support 2 is composed of shotcrete, erected steel frame, installed anchor rods and hung steel mesh.

[0026] The inverted arch part of primary support 2 includes shotcrete and erected steel frame.

[0027] The waterproof layer is made of non-woven fabric and waterproof board.

[0028] see figure 2 , 3 , the steps of implementing the construction method of the present invention are:

[0029] (1), along the excavation contour line of the tunnel arch, perform small conduit ad...

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Abstract

The invention relates to a supporting structure of an extra-large cross-section loess tunnel and a construction method thereof. Larger deformation and even collapse accidents occur in the construction process of the loess tunnel easily. At present, aiming at the large cross-section loess tunnels, the construction of the large cross-section loess tunnel with the excavating area of 140 m<2> is realized by a reserved core soil short step method successfully; the construction of a new loess tunnel with the burial depth of 25 m and the excavating area of 120 m<2> under-passing the existing railway is realized by a CRD method; and the difficulty and the risk of the construction increase gradually along with further increment of the excavated cross-section of the loess tunnel. The supporting structure comprises an initial support, an archwall secondary lining and an inverted arch, wherein a small conduit leading support is arranged along the contour line of the tunnel arch part; and a waterproof layer is arranged between the initial support and the archwall secondary lining. The supporting structure and the construction method thereof have the advantages of effective guarantee of construction safety of the extra-large cross-section loess tunnel, simple construction process, large excavating space, convenient operation for a large-size machine and fast tunnel construction progress.

Description

technical field [0001] The invention relates to tunnels, in particular to a support structure and a construction method for an extra-large section loess tunnel. Background technique [0002] During the construction of loess tunnels, large deformations and even landslide accidents are prone to occur. At present, for large-section loess tunnels, the method of reserving short steps of core soil has been successfully applied to solve the excavation area of ​​140m2. 2 The construction of large-section loess tunnels, and the use of CRD method to solve the problem of buried depth of 25m and excavation area of ​​120m 2 Construction of a new loess tunnel under an existing railway. With the further enlargement of loess tunnel excavation section, its construction difficulty and risk also gradually increase. Although the side wall pilot tunnel method can effectively control settlement, there are many construction steps, narrow construction space, slow construction progress, and high p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/38
Inventor 李雷梁文灏刘培硕刘赪李国良杨国柱赵秋林杨木高谢君泰李凌志刘小刚王新东马洪程李宁
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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