Large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and construction method

Abstract

The invention relates to a large-diameter tube curtain support underground excavation construction super-shallow burying large-section subway station structure and a construction method, belonging to the field of tunnel and underground engineering construction. The structure and the construction method are mainly characterized in that underground excavation subway station construction can be realized under the super-shallow burying condition without affecting ground traffic and constructed structures. The structure is structurally formed in a mode that a large-diameter flange circular steel tube curtain supports are employed on the top part, fender posts are employed on sides, the large-diameter flange circular steel tube curtain supports on the top and the fender posts on the side are organically combined together through top beams so as to form primary support, and inner hole soil bodies are excavated and secondary structures are cast based on the primary support. Compared with the conventional shallow-burying underground excavation engineering method, the structure and the construction method can remarkably reduce station burying depth, lower the engineering cost and realize underground excavated three-layer or multi-layer underground structures; in addition, the top part of a subway station constructed by using the conventional shallow-burying underground excavation engineering method is generally in an arch structure, the spatial utilization rate is low, however, the construction method breaks through the limit, stations constructed by using the method are all in rectangular cross sections, and the top part of the constructed subway station is in a horizontal plane, so that the spatial utilization rate is greatly improved.

Description

technical field [0001] The invention relates to the field of tunnel and underground engineering construction, in particular to the situation that the support system of a subway station adopts a pipe curtain method combined with a hole pile method to construct a multi-storey station underground. Background technique [0002] The pipe curtain jacking method is mainly suitable for soft ground. This construction method originated in Europe in the 20th century. At present, domestic underground excavation stations are mainly constructed by shallow buried underground excavation methods, and mainly have double-layer vaulted straight wall structures. In order to reduce construction risks, The buried depth of the station is generally controlled above 7m. Underground excavation of stations is relatively common in northern my country, and the engineering experience is very rich, but there is no complete case of underground excavation of three-story or more than three-story stations. In...

AI Technical Summary

Problems solved by technology

In the field of domestic subway engineering, especially under the condition of ultra-shallow burial (covering soil 3m), there is no precedent for excavating multi-storey subway stations. The top of the subway station realized by the traditional shallow burial and underground excavation method is generally an arch structure, and the space utilization rate is low.

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