Large-section tunnel support removing and replacing and secondary lining construction method

A construction method and large-section technology, applied in tunnel linings, tunnels, shaft linings, etc., can solve problems such as unfavorable waterproofing and quality assurance of concrete construction, multiple construction sections in one-time dismantling of braces, and increasing the setting of tunnel construction joints, etc. Improve the conversion efficiency and stability, simplify the construction process content, and improve the effect of construction efficiency

Active Publication Date: 2017-09-29
BCEG CIVIL ENG
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  • Abstract
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  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a construction method for removing and replacing braces and secondary linings for large-section tunnels. To solve the technical problems that the existing construction methods are complicated, the structural stress system needs to be replaced multiple times, which is not conducive to the stability of the structure, and To solve the technical problem that construction in a limited space req...

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  • Large-section tunnel support removing and replacing and secondary lining construction method
  • Large-section tunnel support removing and replacing and secondary lining construction method
  • Large-section tunnel support removing and replacing and secondary lining construction method

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Embodiment Construction

[0080] Examples see Figure 5-13 As shown, the existing structure of a large-section tunnel structure includes an initial lining structure 1 and an initial lining temporary structure 2 .

[0081] The primary lining structure 1 includes a primary lining invert 11, a primary lining side wall 12 and a primary lining top arch 13, and the primary lining temporary structure 2 is a steel arch frame, including being arranged in the primary lining structure and separating large-section tunnels into The middle partition and temporary inverted arch of the cavern. The middle partition is divided into the upper middle partition 21 and the lower middle partition 22 according to the location of the cavern. The temporary inverted arch is divided into the side wall between the middle partition and the primary lining side wall. Temporary inverts 23 at the part and temporary inverts 24 in the middle between the partition walls.

[0082] The structure to be constructed of the large-section tunne...

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Abstract

The invention discloses a large-section tunnel support removing and replacing and secondary lining construction method. The method comprises the steps of cutting off a lower layer middle partition wall, constructing an inverted-arch waterproof structure, constructing a secondary lining inverted arch, cutting off a lateral temporary inverted arch, putting up a full hall scaffold template support system of a secondary lining structure, constructing a lateral wall waterproof structure, constructing a secondary lining lateral wall, cutting off an upper layer middle partition wall, constructing a top arch waterproof structure, constructing a secondary lining top arch, demolishing the full hall scaffold template support system, and cutting off the middle partition walls preserved in the second step and the eighth step. According to the large-section tunnel support removing and replacing and secondary lining construction method, the bearing capacity of the temporary structure itself is innovatively utilized, the temporary structure and the full hall scaffold template support system which is erected during secondary lining construction are combined, a conventional support removing and replacing system is replaced, the bearing capacity of the support removing and replacing system is improved, the primary construction section is stretched to 9 m from 6 m, the construction method of a large-section tunnel is sharply simplified, the content of a construction technology is simplified, the construction efficiency is improved, and the work dangerousness is lowered.

Description

technical field [0001] The invention relates to a construction method of a tunnel, in particular to a construction method for removing and replacing braces and secondary lining of a tunnel with a large excavation area. Background technique [0002] At present, the construction of large-section tunnels usually adopts the excavation method of multiple pilot tunnels, and the common construction methods include the double-side pilot tunnel method and the CRD method. Before the construction of the second lining of large-section tunnels, the temporary structure of the primary lining (middle partition and temporary inverted arch) formed by the primary lining support needs to be removed, so that the secondary lining structure can be closed into a ring. [0003] The demolition of the typical primary lining temporary structure and the construction of the secondary lining structure have the following requirements: [0004] 1. The segmental demolition length of the initial lining tempo...

Claims

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Application Information

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IPC IPC(8): E21D11/18E21D11/38
CPCE21D11/18E21D11/381
Inventor 张宏韩竹青卞正涛王玉良石合新游大江王利民王浩
Owner BCEG CIVIL ENG
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