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Rapid construction method of weak surrounding rock large-section multi-arc tunnel

A technology of multi-arch tunnel and weak surrounding rock, which is applied in the field of rapid construction of large-section multi-arch tunnel with weak surrounding rock, can solve the problems that cannot satisfy the rapid construction of multi-arch tunnel, affect the construction progress of multi-arch tunnel, and slow construction speed, etc. Achieve the effects of controlling ground subsidence, reducing the amount of excavation and backfilling, and speeding up construction

Inactive Publication Date: 2012-03-14
CENT SOUTH UNIV
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Problems solved by technology

[0006] Generally speaking, in the current construction of multi-arch tunnels, the construction method of excavating the central pilot tunnel first, then building the central partition wall, and then excavating the main tunnel is mainly adopted. The excavation is divided into many blocks and the construction speed is slow, which seriously affects The construction progress of multi-arch tunnels cannot meet the requirements of rapid construction of multi-arch tunnels. As a result, multi-arch tunnels are generally only suitable for short tunnels with a length of less than 500m.

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  • Rapid construction method of weak surrounding rock large-section multi-arc tunnel
  • Rapid construction method of weak surrounding rock large-section multi-arc tunnel

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] see figure 1 , using the rapid construction method of the soft surrounding rock large-section multi-arch tunnel provided by the present invention, its specific construction procedures are as follows:

[0027] (1) Advance support 1 for the arch of the pilot pit on the left side wall of the left main tunnel by using methods such as advanced small conduit grouting;

[0028] (2) Carry out drilling and blasting excavation of the left side wall pilot pit (Part I) of the left positive hole;

[0029] (3) The initial support of shotcrete anchoring in the pilot pit on the left side wall of the left main hole (installation of steel arch frame, hanging steel mesh, installation of anchor rod, shotcrete) and temporary support 2 (installation of steel arch frame, hanging steel mesh, shotcrete);

[0030] (4) Advance support 3 for the arch of the pilot pit on ...

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Abstract

The invention discloses a rapid construction method of a weak surrounding rock large-section multi-arc tunnel. According to the invention, in tunnel construction, the main tunnel on one side of the multi-arc tunnel and the place of a partition wall are synchronously excavated; the tunnel excavation is implemented by using a double side-wall heading method; then, a primary support and the partition wall are constructed before the secondary lining of the tunnel; and finally, the main tunnel on the other side of the multi-arc tunnel is excavated by using a single side-wall heading method, and a corresponding support structure is built. Compared with the traditional multi-arc tunnel construction method, the construction method disclosed by the invention does not need to cut through a middle guide tunnel and build the partition wall before excavating the main tunnels on the two sides, thereby greatly accelerating the construction of the multi-arc tunnel, shortening the construction period and properly lowering the construction cost.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a rapid construction method for a large-section multi-arch tunnel with weak surrounding rock. Background technique [0002] The multi-arch tunnel has many advantages, such as a large degree of freedom in the selection of the opening position, a small footprint of the lead wire, convenient bridge-tunnel connection, beautiful appearance, and convenient operation and management. In recent years, the multi-arch tunnel structure has been widely used in engineering practice. Its main construction methods are: [0003] (1) Pilot tunnel first excavation method [1、2] . The method is to excavate and penetrate the central pilot tunnel at the position where the partition wall is located in the multi-arch tunnel, and then build the central partition wall from the middle of the central pilot tunnel to the openings at both ends of the tunnel. Excavation of side tunnels and construction of corr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/10
Inventor 施成华彭立敏杨伟超雷明锋丁祖德
Owner CENT SOUTH UNIV
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