Tunnel open cutting construction process

Abstract

The embodiment of the invention discloses a tunnel open cutting construction process, and relates to the technical field of tunnel construction. The process comprises the following steps of S1, off drainage construction; S2, adopting the one-way tunneling manner from inside of a tunnel to the outside of the tunnel in hole outlet construction, and before hole outlet, performing forepoling; S3, anchorage pile construction; and S4, open cut tunnel segment excavating, wherein earthwork generated in the open cut tunnel segment excavating process is backfilled into an arch head of a primary supporting arch frame. Before hole outlet, forepoling is carried out, the primary supporting arch frame is added on the open cut tunnel segment, along with the construction of the primary supporting arch frame, earthwork generated in the open cut tunnel segment excavating serves as backfill soil to cover the arch top, a open cut tunnel underground excavation method is adopted for construction, the tunneling safety and construction efficiency are improved, the construction period is shortened, open cut tunnel underground excavation is adopted, the problems that due to deep foundation pit construction,the period is long, and construction safety is difficulty ensured can be solved, before excavation, cut drainage construction is carried out, surface water is intercepted, and construction safety andconstruction proceed are further ensured.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of tunnel construction, in particular to a tunnel cut-and-open construction process. Background technique [0002] With the rapid development of the economy, the demand for various transportation infrastructure such as rail transit and highways is gradually increasing. It is inevitable to use excavated tunnels to pass through some obstacles during the construction process. environment. [0003] The original surface slope of the cut-and-cut section is generally steep, and there are no other roads available except through the tunnel as the access road. If a high side slope is opened and excavated, it will affect the overall stability of the entire mountain. Huge, the difficulty of backfilling non-passable roads will increase, and the construction period will be long and the cost will be high. Contents of the invention [0004] For this reason, the embodiment of the present inventi...

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Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a tunnel open-cut construction technology to solve the problems of long construction period and high cost in the prior art due to the relatively steep slope of the original surface of the open-cut section during tunnel construction.

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