Construction method for reverse direction underground excavation of large inclination-angle escalator passage in thin-layer crushed hard rock stratum

Abstract

The invention discloses a construction method for reverse direction underground excavation of a large inclination-angle escalator passage in a thin-layer crushed hard rock stratum. The construction method comprises the following construction steps of S1, construction preparation, S2, lower pilot tunnel construction, S3, upper pilot tunnel construction, S4, deslagging and forming, and S5, construction of a bottom plate and second lining concrete. The construction method for reverse direction underground excavation of the large inclination-angle escalator passage in the thin-layer crushed hard rock stratum has the beneficial effects that reverse direction excavation is used, thus the disturbance time is less, and a support structure is stable, safe and reliable; the construction processes such as a single side-wall pilot tunnel method, a double side-wall pilot tunnel method and a bench method are combined scientifically, and the conflict between safety and the progress is handled effectively; the construction speed is high, the construction cost is low, the influence on the ground surface environment and an existing building is small, and economic benefits and social benefits are significant; and practicability and operability are high.

Description

technical field [0001] The invention relates to the technical field of tunnel process construction, in particular to a reverse-direction underground excavation construction method for a large dip-angle escalator channel in a thin-layer broken hard rock stratum. Background technique [0002] With the continuous development of social economy and the rapid advancement of urban construction, escalator passages are used more and more in vertical transfer stations, and are developing in the direction of multi-functionality. [0003] Escalator passages are generally set up in areas with special functions, dense flow of people and goods, and large traffic flow. During the construction of underground escalator passages, due to unfavorable factors such as complex geological conditions, many surface structures, and pre-buried depths, the traditional positive step method is used for construction. There are many times of excavation disturbance, and it is difficult to guarantee the use an...

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Problems solved by technology

[0003] Escalator passages are generally set up in areas with special functions, dense flow of people and goods, and large traffic flow. During the construction of underground escalator passages, due to unfavorable factors such as complex geological conditions, many surface structures, and pre-buried depths, the traditional positive step method is used for construction. There are many times of excavation disturbance, and it is difficult to guarantee the use and operation safety of ground traffic and existing structures. Although the safety factor of side wall pilot pits is high, it is limited to the current excavation section of escalator passages. Unfavorable factors such as narrow space, low construction efficiency, slow progress, and high cost

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