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A Construction Technology of Triple Arch in Crossing Section of Large-Section Tunnel

A construction technology and large-section technology, applied in tunnels, tunnel linings, shaft linings, etc., can solve problems such as low safety factors and achieve the effect of reducing hidden dangers of subsidence

Active Publication Date: 2017-08-29
CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG
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Problems solved by technology

[0003] The invention provides a triple-arch construction technology for the crossing section of a large-section tunnel, which solves the technical problem of low safety factor existing in excavating a large cross-section of a tunnel crossing section by the mining method

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  • A Construction Technology of Triple Arch in Crossing Section of Large-Section Tunnel
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  • A Construction Technology of Triple Arch in Crossing Section of Large-Section Tunnel

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Embodiment Construction

[0018] The present invention is described in detail below in conjunction with accompanying drawing:

[0019] A construction technique for triple arches in crossing sections of large-section tunnels, comprising the following steps:

[0020] The first step is to draw the excavation contour line of the upper left middle pilot tunnel on the tunnel excavation work surface, and perform advanced support for the upper left middle pilot tunnel above the excavation contour line of the upper left middle pilot tunnel, including the large pipe shed and the advanced Small conduit, and pre-grouting to reinforce the arch soil, then excavate the soil of the upper left middle pilot tunnel (1) and apply initial support; on the tunnel excavation work surface, draw the upper right middle pilot tunnel for excavation Contour line, above the contour line of the excavation of the upper right middle pilot tunnel, perform advanced support for the upper right middle pilot tunnel, including the large pipe...

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Abstract

The invention discloses a three-arch construction process for a connecting tunnel of a large cross-section tunnel. The three-arch construction process solves the problem of low safety factor when the connecting tunnel is subjected to large cross-section excavation by a mining method. The excavated cross section of the large-span subway tunnel is divided into five segments in a span direction and the five segments are excavated respectively, in this way, the roof collapse risk during cross-section excavation is reduced. In an excavation process, a left pilot tunnel, a right pilot tunnel and a mid-span pilot tunnel are sequentially enclosed to construct a support, so that the risk in a subway tunnel excavation implementation process is greatly reduced; in particular, a gap exists between the primary support of the left pilot tunnel and a left-middle wall (5) after the left-middle wall (5) is constructed, and can easily cause deformation of the primary support of the left pilot tunnel in a blast working process of the followed-up pilot tunnel, a method of backfilling concrete at the upper part of the gap and backfilling residue soil at the lower part thereof is adopted to overcome the defect that the gap can easily cause deformation of the primary support, thus, the gap backfilling strength is improved and the construction cost is saved.

Description

technical field [0001] The invention relates to a method for excavating a large-section tunnel with a mining method, in particular to a method for excavating a crossing section of a large-section tunnel with a mining method. Background technique [0002] In the construction of subway tunnels, the cross-section tunnel needs to be excavated with a large section using the mining method to meet the requirement that the main line section and the parking line are in the same large-section tunnel. The large-section excavation generally adopts the middle partition wall method (CD method) or Cross partition wall method (CRD method), CD method is a construction method in which one side of the tunnel is excavated in sections first, and the partition wall is constructed, and then the other side is excavated in sections in a long-span tunnel with weak surrounding rock. The CRD method is a construction method in which in a long-span tunnel with weak surrounding rock, one side of the tunne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/00E21D11/38
CPCE21D9/00E21D11/003E21D11/383
Inventor 李健学韩永乐李兆连王飞王喜强汤景志丛林孙一韩通
Owner CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG
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