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
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[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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