Two-unit and six-step construction method for shallow-buried large-span tunnel

Abstract

The invention relates to the technical field of tunnel construction, in particular to a two-unit and six-step construction method for a shallow-buried large-span tunnel. The two-unit and six-step construction method solves the problem that a construction method which is simple in technology, can achieve the effects of isolation and supporting in the tunnel construction process is lacked in existing soft soil tunnel construction in a water-saturated area. The two-unit and six-step construction method includes the steps of excavating an upper bench of an upper unit and constructing preliminary supporting; excavating an lower bench of the upper unit and constructing preliminary supporting; mounting a cross beam at the separation position of an upper unit body and a lower unit body and constructing a concrete center septum; mounting a support arching on the center septum; excavating an upper bench of an lower unit and constructing preliminary supporting; and excavating and constructing an inverted arch and filling of the inverted arch, and completing enclosing of a tunnel face and forming a ring. By adoption of the two-unit and six-step construction method, water stored in a reservoir is effectively prevented from seepage, not only is the surrounding environment of the reservoir is protected, but also the construction safety is ensured, special equipment is not needed to be invested in construction, the construction quality meets the structural requirements, and the construction method is convenient to operate, and has strong generalization performance.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a two-unit six-step construction method for a shallow-buried large-span tunnel. Background technique [0002] It is inevitable to encounter tunnels of various landform types in railway engineering, among which the difficulty of construction is most prominent for large-section tunnels in weak strata. With the progress of society and the continuous updating of construction technology, the construction methods used in large-section tunnels include the method of reserving core soil in arc-shaped pilot pits, CD method, CRD method, single-side pilot-pit method, and double-side-wall pilot pit method. , Three-step seven-step excavation method and other mature techniques. [0003] When the tunnel inevitably needs to pass through underground projects such as reservoirs with rich water sources and poor geological conditions, the construction safety risks are high, and large def...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a shallow-buried long-span tunnel in order to solve the problem of the lack of a construction method with a simple process and a certain separation and support function in the tunnel construction in the existing soft soil layer tunnel construction in the saturated water area. Two-unit six-step construction method

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