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Support structure for large-span shallow-buried underground tunnel in urban sensitive area

A technology for supporting structures and sensitive areas, used in tunnels, structural elements, tunnel linings, etc.

Inactive Publication Date: 2012-02-08
CHINA FIRST HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this support structure only needs to add a certain amount of prestressed anchor cables to the conventional New Austrian Method construction principle tunnel, which can solve the construction problem of large-span underground excavation tunnels in urban sensitive areas

Method used

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  • Support structure for large-span shallow-buried underground tunnel in urban sensitive area
  • Support structure for large-span shallow-buried underground tunnel in urban sensitive area
  • Support structure for large-span shallow-buried underground tunnel in urban sensitive area

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, patent of the present invention is described in detail:

[0030] Parameter determination: The use of this technology needs to be combined with engineering conditions and excavation steps, specifically including: steel arch parameters, prestressed anchor cable layout methods and parameters and other related parameters.

[0031] Specific implementation steps:

[0032] 1. The use of this technology needs to be designed in combination with engineering conditions and excavation steps.

[0033] 2. Excavation according to the design sequence.

[0034] 3. Preliminary support steel arch frame, installation of anchor pad structure, initial shotcrete, ordinary anchor cable application and shotcrete, this step needs to reserve the position of prestressed anchor cable.

[0035] 3. Prestressed anchor cable drilling, cable lowering, grouting, anchoring, anchor sealing and other related processes.

[0036] 4. The other procedures are t...

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Abstract

The invention provides a support structure for a large-span underground tunnel in an urban sensitive area. By adopting the support structure, the problem on constructing the large-span underground tunnel in the urban sensitive area can be effectively solved by only adding a certain number of prestress anchor cables on a tunnel constructed based on a construction principle of the conventional new Austrian tunnelling method. The support structure comprises the prestress anchor cables, a primary-support structural steel arch frame, an anchoring pad structure, preset anchor holes, sprayed concrete, a waterproof layer, secondary-lining concrete and the like. Generally, compared with the support structure of the tunnel constructed by using the principle of the conventional new Austrian tunnelling method, the support structure provided by the invention the characteristics of better feasibility, lowered risk, reduced construction cost, less investment, obvious effect, simple process, easiness for popularization and application, and the like.

Description

technical field [0001] The patent of the present invention is a support structure for long-span shallow-buried tunnels in urban sensitive areas. Background technique [0002] At present, the vast majority of various underground tunnels are constructed using the construction principle of the New Austrian Method. The construction principles of the new Austrian method can be summarized as the following points: [0003] 1. The new Austrian method believes that rock mass is the main bearing unit in the structural system, and it is necessary to minimize disturbance to the rock mass during construction to avoid excessive damage to the strength of the rock mass. [0004] 2. In order to give full play to the bearing capacity of the rock mass, the deformation of the rock mass should be allowed and controlled. [0005] 3. In order to improve the mechanical performance of the supporting structure, it should be closed as soon as possible during construction to become a closed cylindric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D20/00E21D11/38E04C5/12
Inventor 连佳机张志勇皋北陈小平
Owner CHINA FIRST HIGHWAY ENG
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