Molded lining support structure and construction method for soft soil ground layer

Abstract

The invention discloses a molded lining support structure and a construction method for a soft soil ground layer. The molded lining support structure comprises a closed lining support, the closed lining support comprises a plurality of steel tubes, first connecting steel plates, second connecting steel plates and concrete, the steel tubes are longitudinally and uniformly arranged, the adjacent steel tubes are communicated through the first connecting steel plates and the second connecting steel plates, and the concrete is poured in the steel tubes and spaces enclosed by the adjacent steel tubes, the first connecting steel plates and the second connecting steel plates. The molded lining support structure provides closed permanent lining support for an underground excavation project before the underground excavation project is excavated. Excavation workers do not need to worry about the problems of ground settlement and the like caused by unstable tunnel faces when large-area soil is excavated for the underground excavation project under the support of the closed lining support structure, so that the molded lining support structure and the construction method can be applied to any soft ground layers, and have the advantages of high construction process safety and mechanization degree.

Description

technical field [0001] The invention relates to the technical field of underground engineering underground excavation design and construction, in particular to a molded lining support structure and construction method for soft ground. Background technique [0002] With the rapid and sustainable development of my country's social economy, many large and medium-sized cities in China have started large-scale subway construction and underground space development. For the construction of underground stations, the open-cut method is usually adopted. However, the dense commercial, corporate, financial, and residential buildings in the downtown area, heavy traffic, expensive land, and the constraints of dense underground pipelines and underground structures make it difficult for some stations to adopt open-cut methods. Therefore, in the construction of domestic subways, the proportion of underground subway stations is on the rise. [0003] At present, the domestic fully underground...

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Problems solved by technology

Although these construction methods have successfully completed some underground excavation projects, they have disadvantages such as long construction period, many temporary structures, large ground subsidence, and low degree of mechanization.

At the same time, the above-mentioned traditional underground excavation methods also have a common feature, that is, the length or stiffness of the advance support is limited, and a certain self-stabilization ability of the tunnel face is required to control the ground subsidence, which has certain requirements for the stratum. In soft ground, the above-mentioned underground excavation method is difficult to implement smoothly

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