Method for separately constructing underground expressway under urban main roads and subway shield zone

Abstract

The invention discloses a method for separately constructing an underground expressway under urban main roads and a subway shield zone, which is used for underground engineering construction in soft muddy soil in coastal regions. The method specifically comprises steps as follows: 1) underground continuous wall construction and foundation consolidation are performed; 2) uplift piles and erect column piles are constructed; 3) the soil mass is excavated to the bottom of a first support, top beams and concrete supports are poured, the soil mass is sequentially excavated to the bottom of a secondsupport and the bottom of a third support, each steel support is erected, prestress is applied, the soil mass is excavated to the bottom of a designed foundation pit, and plain concrete cushion layersand underground express framework bottom plates are poured; 4) the third support, the second support and the first support are sequentially dismounted, side walls are poured, framework inside supports are erected, a framework top plate is poured, and the columns are dismounted finally; 5) an additional waterproof layer of the framework top plate is constructed, and soil filling is performed to recover the urban main roads. Compared with the prior art, the problems of unsafety, structure instability and the like during construction are solved, and a new thought is provided for construction ofthe underground expressway tunnels and the subway shield zone in the soft muddy soil in the coastal regions.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to a construction method for separate construction of an underground expressway under an urban arterial road and a subway shield section in coastal muddy soft soil. Background technique [0002] With the modernization of the city, it is not suitable to build a new elevated expressway on the upper part of the urban main road in the existing high-grade business district and high-end residential area, and the underground expressway has to be built. In this way, when the soil strength of the lower part of the main road in the city is relatively strong, the process of the underground expressway and the subway shield section is generally excavated and poured first to construct the underground expressway tunnel, and then to construct the subway section. At this time, no pre-reinforcement and reduction Shen measures. However, if the project construction area is under the...

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Problems solved by technology

[0003] The present invention aims at the problems existing in the separate construction of underground expressway tunnels and subway shield tunnels in silty soft soil under urban arterial roads, that is, unsafe construction, unstable frame structure of underground expressway tunnels, and unstable lining structure of subway shield tunnel segments, etc. , proposed a construction method for the separate construction of the urban main road underground expressway and the subway shield section, this method effectively added advanced pre-reinforcement and settlement reduction measures to the original project, and simplified the construction based on the general pressure arch theory The model calculates the minimum cover thickness of the upper part of the lining structure in the shield section, which provides a new idea for the construction of underground expressway tunnels and subway shield sections in the muddy soft soil under the main roads of such cities

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