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Supporting structure for zero distance underneath pass of existing station of rectangular tunnel section and construction method

A technology of existing stations and supporting structures, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of difficult recovery of superstructure, large deformation, unable to meet the needs of subway engineering development, etc., and achieve the effect of reducing investment.

Inactive Publication Date: 2016-10-26
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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AI Technical Summary

Problems solved by technology

Practice has found that the deformation caused by the above-mentioned construction method is still very large, and once the superstructure has settled and deformed, it is difficult to recover even after re-grouting reinforcement, which cannot meet the needs of the development of the subway project.

Method used

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  • Supporting structure for zero distance underneath pass of existing station of rectangular tunnel section and construction method
  • Supporting structure for zero distance underneath pass of existing station of rectangular tunnel section and construction method
  • Supporting structure for zero distance underneath pass of existing station of rectangular tunnel section and construction method

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Embodiment Construction

[0035] The present invention will be described in detail below in combination with specific embodiments.

[0036] The present invention relates to a support structure for a rectangular tunnel cross-section passing through an existing station at zero distance. Before excavation of a mine tunnel, a deep hole grouting reinforcement 6 is applied to the face of the tunnel, and the core soil is reserved by ring excavation. Excavate the upper and lower pilot tunnels on the inner and outer sides of the left and right lines symmetrically, and implement the initial support 7 in time. Install 1 jack 4+shaped steel frame 3 at the bottom of the existing station 1, every 3 grid steel frames longitudinally. Three sets of 100t hydraulic self-locking jacks 4 are installed in each mileage section of the line. When excavating, erect the vertical section steel frame 3 of the side wall first, and weld the connecting bars; The installation method of the parts is as follows: Figure 4 shown. The...

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Abstract

The invention relates to a supporting structure for zero distance underneath pass of an existing station of a rectangular tunnel section and a construction method. Settlement deformation of underneath pass of the existing station of a newly-built line is large. Before a tunnel is dug, deep hole grouting reinforcing bodies are constructed on the tunnel face of the tunnel, the method of ring-excavation with the core soil reserved is adopted to symmetrically dig upper guide holes and lower guide holes on the inner side and the outer side of a left line and a right line, a preliminary support is constructed in time, jacks are longitudinally arranged below the existing station, and a side wall vertical profile steel frame is erected. Through the synergistic effect of the steel frame + H steel + the hydraulic jacks + reinforcing rob plates +grouting materials and the like, a hydraulic synchronous control jack-up technique is adopted in combination with other auxiliary measures, the multiple large-tonnage jacks which are mounted on a newly-built preliminary supporting structure in advance form group jacking and supporting to provide reaction force compensation for an existing subway structure, a rigid and adjustable joint supporting system is formed, an upper existing station structure is supported, and the purpose of effectively controlling deformation of the existing station structure is achieved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a support structure and a construction method for a rectangular tunnel cross-section passing under an existing station at zero distance. Background technique [0002] With the large-scale construction of urban rail transit in my country, the utilization rate of urban underground space is gradually increasing, and there are more and more cases where new lines need to pass through existing lines. There are three types of crossing methods: top, bottom and side crossing. Among them, the project of passing under the existing subway line, especially the project of tunneling under the existing subway station is the most difficult and risky. During the construction process of the subway tunnel passing through the existing station, the surrounding rock and soil will be disturbed and the strata will be deformed. When the deformation reaches a certain level, the operation safety ...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/00E21D11/10E21D15/44E21D15/54E21D15/55
CPCE21D9/00E21D9/001E21D11/003E21D11/10E21D15/54E21D15/55
Inventor 贾少春王春希王立新高志宏戴志仁王俊王天明张海倪飞高升段亚刚翁木生王博王海祥雷永生向阳马晓波
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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