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Construction method of shallow-buried long-span tunnel under the existing high-speed railway

A technology of shallow buried excavation and high-speed railway, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of groundwater loss, unavoidable settlement, difficult to control surface settlement within the allowable range, etc., and achieve less process interference , The effect of reducing the project cost

Active Publication Date: 2011-12-21
THE SECOND CONSTR OF CTCE GROUP
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AI Technical Summary

Problems solved by technology

[0002] At present, my country's high-speed railway construction is developing rapidly, and the line has strict requirements on foundation settlement. During the construction of the new line, it will inevitably need to cross the existing ballastless track line. The settlement control requirements of the ballastless line are strict, and the settlement after construction is not allowed to exceed 15mm , the existing underground excavation tunnel construction technology is shallow buried in the tunnel, during the construction period, groundwater loss, settlement is inevitable, it is difficult to control the surface settlement within the allowable range, so it is necessary to study the tunnel excavation and support construction technology by steps, various advanced Reinforcement, water-stop grouting construction technology, automatic monitoring and measurement technology to ensure the safety of existing line construction

Method used

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Embodiment Construction

[0015] The following describes specific implementations of the present invention by combining specific actual conditions.

[0016] Before the construction of the underpass tunnel, conduct a detailed investigation of the structural conditions of the surface track, the surrounding rock conditions of the tunnel, and the water content of the groundwater, draw a diagram of the relative position between the underpass tunnel and the surface track, and analyze the various impacts that the tunnel construction may have on the surface track;

[0017] Before the excavation of the underpass tunnel, the advanced pipe shed support shall be constructed first. The pipe shed is made of advanced φ89×5 seamless steel pipes. The length is 10m, the circumferential spacing is 40cm, the construction external insertion angle is about 12°, and the lap length between the two loops is not less than 3m; the grouting holes are drilled on the steel flower pipe, the hole diameter is 10-16mm, and the hole spac...

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Abstract

The invention discloses a construction method in the railway field, in particular relates to a construction method of a large-span tunnel passing through a rapid transit railway with a shallow tunneling process. The construction method comprises the following construction steps of: 1, advance supporting and pre-reinforcing; 2, partial excavation and millisecond blasting; and 3, short-bench excavation support construction. In a construction process, grouting technologies such as curtain grouting, full-section grouting, radial grouting and the like are used for blocking an underground water seepage channel to control the loss of underground water; and in the construction process, an automatic high-precision monitoring method and a fixed target high-precision monitoring method are adopted for carrying out monitoring to ensure that the influence of tunnel passing-through construction on rapid transit railway tracks on the ground surface is immediately found. By using the construction method, the safety of the tracks can be ensured when a newly-built railway passes through ballastless tracks.

Description

technical field [0001] The invention discloses a construction method in the field of railways, and in particular relates to a construction method for a shallow-buried long-span tunnel when a newly-built line crosses an existing track-free track line. Background technique [0002] At present, my country's high-speed railway construction is developing rapidly, and the line has strict requirements on foundation settlement. During the construction of the new line, it will inevitably need to cross the existing ballastless track line. The settlement control requirements of the ballastless line are strict, and the settlement after construction is not allowed to exceed 15mm , the existing underground excavation tunnel construction technology is shallow buried in the tunnel, during the construction period, groundwater loss, settlement is inevitable, it is difficult to control the surface settlement within the allowable range, so it is necessary to study the tunnel excavation and suppor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D11/18E21D11/10F42D3/04F42D1/00
Inventor 费富华戚鹏李波吴波蒋耀峰马海强赵飞陈辉顾智刚杨仲杰
Owner THE SECOND CONSTR OF CTCE GROUP
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