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City middle-drift-free branch tunnel U-turn construction method

A construction method, tunnel technology, applied in tunnels, tunnel lining, earthwork drilling and mining, etc.

Active Publication Date: 2020-10-23
CHINA ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At home and abroad, there are a lot of literature on the construction method and optimization of multi-arch tunnels, but most of them are aimed at the research and optimization of the conventional three-pilot construction method and the middle-pilot construction method. The specific operation methods, possible construction mechanical responses during construction, and system excavation optimization parameters are basically not involved.

Method used

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  • City middle-drift-free branch tunnel U-turn construction method
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  • City middle-drift-free branch tunnel U-turn construction method

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Embodiment

[0052] The present invention is illustrated by taking the tunnel construction of the East Link Project in Luohu District, Shenzhen City as an example.

[0053] The route of the east-connection project is generally east-west. It is connected with the Liantang Tunnel of Shenzhen Eastern Transit Expressway on the east side of Tangpai in the form of a tunnel. According to the design plan, within the scope of the east-connection 1 standard, the main line of the east-connection line and the southeast direction SE / ES The ramp is a "Y"-shaped bell-mouth bifurcation tunnel, which is located under the valley. The two lanes of the main line and the ramp converge into four lanes, and then the cross-section becomes three lanes. The maximum span of the tunnel excavation exceeds 25m, respectively. Branching off from the ES ramp and branching off of the main line on the south line from the SE ramp.

[0054] Due to land acquisition and demolition, it is impossible to find a suitable site to dr...

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Abstract

The invention relates to a city middle-drift-free branch tunnel U-turn construction method. The city middle-drift-free branch tunnel U-turn construction method comprises the following steps that (1),a small clear distance pilot cavity is excavated in the direction towards a branch large section of a main cavity from a ramp tunnel; (2), after preliminary supporting of the pilot cavity is completed, construction of a multiple-arch section is carried out with a single cavity construction method, and construction of a hidden type middle wall and a multiple-arch secondary lining is completed; (3),after the construction of the multiple-arch secondary lining is completed, excavation is expanded forwards to the branch large section; and (4), excavation is carried out back to the other side of the multiple-arch section in a U-turn mode after a transverse guide cavity is excavated when excavation is expanded to a U-turn position of the branch large section, excavation and supporting of a latercavity are completed, and U-turn construction of a middle-drift-free branch tunnel is completed. Compared with the prior art, the city middle-drift-free branch tunnel U-turn construction method has the advantages that temporary supporting is canceled, the construction cost is saved, and the construction technology is simplified.

Description

technical field [0001] The invention relates to the field of tunnel construction design, in particular to a U-turn construction method for an urban bifurcation tunnel without a pilot tunnel. Background technique [0002] The multi-arch tunnel is a new type of long-span tunnel proposed with the rapid development of highway construction in my country. It has a smooth line shape, a small footprint, and a high space utilization rate. At the same time, it has advantages in adapting to terrain conditions, environmental protection and engineering quantity. However, in actual construction, the construction conditions of multi-arch tunnels are not suitable for constructing the pilot tunnel first, and then excavating the tunnels on both sides. Therefore, some tunnels need to adopt the construction method without intermediate pilot tunnels. [0003] At home and abroad, there are a lot of literature on the construction method and optimization of multi-arch tunnels, but most of them are...

Claims

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Application Information

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IPC IPC(8): E21D9/14E21D11/10E21D11/15E21D11/18
CPCE21D9/14E21D11/10E21D11/152E21D11/18
Inventor 连卫东丁文其段超李晓冉王炜
Owner CHINA ROAD & BRIDGE
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