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Method for excavating upper-soft lower-hard formation small-section tunnel underneath urban main road

A technology for tunnel excavation and trunk roads, applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of poor tunnel forming conditions and high construction risks, and achieve high safety, controllable risks, and low impact Effect

Active Publication Date: 2016-11-16
THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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Problems solved by technology

[0002] In recent years, major cities have continued to develop underground public transportation facilities. During the construction of urban underground transportation, it is inevitable to encounter some shallow buried tunnels that pass through the main roads of the city. In the soft and hard composite stratum, the conditions for tunneling are poor. At this time, the traditional drilling and blasting excavation method is extremely risky. It is aimed at the small section of shallow buried excavation under the condition of soft and hard composite stratum on the main road of the city. Tunnel construction, in order to effectively control ground subsidence and ensure the safety of tunnel construction, a specific tunnel excavation construction method is required

Method used

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  • Method for excavating upper-soft lower-hard formation small-section tunnel underneath urban main road
  • Method for excavating upper-soft lower-hard formation small-section tunnel underneath urban main road
  • Method for excavating upper-soft lower-hard formation small-section tunnel underneath urban main road

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specific Embodiment approach

[0026] The specific implementation of this process is as follows:

[0027] (1) Before the excavation of the tunnel, a small conduit is installed in the weak backfill soil layer of the vault for advanced support. The length of the small conduit is 2.5 meters, the diameter is 42mm, and the distance is 0.3 meters. The incident direction and the horizontal plane have an elevation angle of 3-5° , and do it every 0.5 meters.

[0028] (2) Excavate the backfill soil layer of part A, adopt manual excavation, excavate the arc-shaped pilot pit first, and then excavate the core soil after the support is formed, and the length of each excavation shall not exceed 0.5m. Immediately after the excavation is completed, steel arches are used to support the excavation site, and vertical and horizontal temporary supports are set up to close the arches in time. The primary support arch foot and the temporary support arch foot must fall on the base hard rock to ensure the stability and compactness ...

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Abstract

The invention discloses a method for excavating an upper-soft lower-hard formation small-section tunnel underneath an urban main road, and the method is mainly applied to excavation construction for the small-section tunnel underneath the urban main road under a complex formation condition. Since geological conditions for tunnel construction are poor and settlement of a ground level road must be strictly controlled, the face of the tunnel is divided into five sections for sequential and alternate excavation from soft to hard and from top to bottom according to the rock and soil distribution situation of the excavated face of the tunnel in the tunnel excavation construction process; along with the reduction of the to-be-excavated face during excavation, drilling footage can be effectively controlled, and disturbance to the original formation around the tunnel is reduced accordingly; and after excavation is completed, sealing and supporting can be conducted quickly, the exposure duration of the excavated face is shortened to the maximum extent, and therefore, construction safety is guaranteed.

Description

technical field [0001] The method is suitable for the excavation construction method of shallow-buried small-section tunnels passing through urban main roads on soft and hard strata. Background technique [0002] In recent years, major cities have continued to develop underground public transportation facilities. During the construction of urban underground transportation, it is inevitable to encounter some shallow buried tunnels that pass through the main roads of the city. In the soft and hard composite stratum, the conditions for tunneling are poor. At this time, the traditional drilling and blasting excavation method is extremely risky. It is aimed at the small section of shallow buried excavation under the condition of soft and hard composite stratum on the main road of the city. In tunnel construction, in order to effectively control ground subsidence and ensure tunnel construction safety, a specific tunnel excavation construction method is required. Contents of the ...

Claims

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Application Information

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IPC IPC(8): E21D9/00
CPCE21D9/00
Inventor 葸振东仇意汪强宗冷亚夫李玲
Owner THE THIRD ENG CO LTD OF THE HIGHWAY ENG BUREAU OF CCCC
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