Construction method of shallow-buried large-span tunnels

A technology for tunnel construction and construction methods, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as construction safety risks, and achieve the effects of small single pile engineering, fast construction, and reliable quality

Inactive Publication Date: 2016-03-02
BEIJING GENERAL MUNICIPAL ENG DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0021] The purpose of the present invention is to provide a construction method for a shallow-buried large-span tunnel to solve technical proble

Method used

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  • Construction method of shallow-buried large-span tunnels
  • Construction method of shallow-buried large-span tunnels
  • Construction method of shallow-buried large-span tunnels

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Embodiment Construction

[0047] The method and steps of the present invention are as follows:

[0048] ①Using the shallow buried characteristics of the tunnel, vertical piles are built from the ground, and the bottom of the pile is placed under the arch bottom of the proposed tunnel with a stable bearing layer, that is, along the periphery of the proposed tunnel and in the ground before the undercut construction of the tunnel. , The vertical support piles were left in advance. In the subsurface excavation construction, the horizontal support of the initial support structure is connected with the preset vertical support piles through the partial excavation, and the ground disturbance and displacement caused by the tunnel excavation are transmitted to the deeper and more stable ground to control the surface settlement .

[0049] ②In order to reduce the engineering risk after the initial support vertical temporary support is removed and before the strength of the secondary lining reinforced concrete structur...

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Abstract

The invention discloses a construction method of shallow-buried large-span tunnels. The method comprises the following steps: (1) building vertical piles on the ground by using the shallow-buried characteristics of the tunnels, putting the pile bottoms in a stable force-keeping layer below the bottoms of the tunnel arches to be built, namely reserving vertical support piles in advance in the peripheries and the lands of the tunnels to be built before carrying out underground excavation construction of the tunnels; (2) carrying out partial excavation during underground excavation construction, and connecting transverse supports of initial bracing structures to the preset vertical support piles; and (3) completing a process of pouring secondary linings under the condition that the initial vertical temporary supports are not removed; and removing the vertical temporary supports in the structures after the secondary linings form the strength and completing structure construction. Through the construction method of the shallow-buried large-span tunnels, the technical problems of the construction safety risk during pouring the secondary linings and the sedimentation control of the poured road surface can be solved.

Description

Technical field [0001] The invention belongs to a construction method of a shallow buried large-span tunnel underneath a road. Background technique [0002] Limited ground resources and traffic efficiency are difficult to meet the needs of rapid traffic at intersections. Using underground tunnels (or pedestrian underpasses) to form an overpass with ground roads is one of the engineering solutions to avoid interference and relieve congestion. [0003] The underpass tunnel (or passage) placed in an urban environment usually has the following characteristics: [0004] ①Shallow buried. Under urban environmental conditions, the ground and underground space resources are limited, and the underpass tunnels are required to be laid in a vertical position as shallow as possible. For the underpass tunnel, the shallower vertical buried depth can shorten the tunnel length under the same slope, which is beneficial to reduce the occupation of ground space by the open climbing section at both ends...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/10
CPCE21D9/00E21D11/10
Inventor 陈仁东
Owner BEIJING GENERAL MUNICIPAL ENG DESIGN & RES INST
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