Amplitude separation and reverse support replacement construction method for open-excavated single-layer twin-bore or multi-bore tunnel

Abstract

The invention discloses an amplitude separation and reverse support replacement construction method for an open-excavated single-layer twin-bore or multi-bore tunnel. For a twin-bore (multi-bore) single-layer underground road structure, the structure is free of amplitude separation, stage construction is carried out according to an open excavation and ordinal construction method and is completed in the manners of stage excavation of a foundation pit and stage implementation of the structure, the influence on current traffic is reduced, and the site space and project cost are reduced. A middle-row support structure is arranged at a stage excavation interface of the foundation pit, and reverse support replacement from top to bottom is carried out on the middle-row support structure when thefoundation pit is excavated in the later period, so that water and soil pressure of the outer side wall of the foundation pit excavated in the later period is safely transferred to a middle wall and aslant throwing support, and the middle-row support structure is removed after safe unloading is achieved. By means of the method, the technical problems of traffic reconciliation difficulties, site deficiency and the like during construction of underground roads under the condition of narrow sites in a city can be solved.

Description

technical field [0001] The invention relates to a technique for constructing an underground road by an open cut method. Background technique [0002] With the rapid growth of urban traffic demand, large cities at home and abroad have accelerated the construction of second-floor traffic. It is becoming more and more common to build underground roads by open and cut methods in prosperous and downtown areas. The surrounding environment of the foundation pit is complex and the construction space is narrow. In order to reduce the impact on the existing traffic, it is often necessary to meet the requirements of the traffic management department to "take one for one" and "cannot be interrupted". However, the width of the foundation pit of the underground road structure often reaches 30-50m, and the site contradiction is prominent. [0003] In order to solve this problem, the commonly used methods are "structural framing", "covering and digging" and so on. The above methods have ...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a construction method for open-cut single-layer double-or multi-hole tunnels with frame-reversing and reverse bracing, so as to solve technical problems such as traffic relief and insufficient construction sites caused by the construction of underground roads in narrow urban areas

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