Underground excavation type column-free arched subway station structure and construction method thereof

Abstract

The invention provides an underground excavation type column-free arched subway station structure and a construction method thereof. The underground excavation type column-free arched subway station structure comprises a chamber defined by an arch cover, a side wall secondary liner and an inverted arch; a middle plate perpendicular to the side wall secondary liner is arranged between the arch cover and the inverted arch, the chamber is divided into an upper half section chamber and a lower half section chamber by the middle plate, and the middle plate comprises a straight middle plate and an arched middle plate; the straight middle plate comprises a straight middle segment and straight two-side segments, the arched middle plate comprises an arched middle segment and arched two-side segments, and the straight middle segment and the arched middle segment are of an integral structure. According to the underground excavation type column-free arched subway station structure, the design practice of the subway station in China for many years is broken through, the column-free situation of a public area of a platform layer of the subway station is successfully achieved, middle supporting of a floor slab is provided through the arch-shaped structure, the force bearing demands of large mid-span floor slabs are met, the space between the arched middle plate and the straight middle plate is used as an in-station rail top air flue, the using function of the station is met, and the problem that a current rectangular rail top air flue is large in construction difficulty is solved.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering and underground engineering support, and in particular relates to an underground excavation subway station, in particular to an underground excavation column-free arched subway station structure and a construction method. Background technique [0002] The span of the subway station is generally about 20m. For underground excavation subway stations, the current design usually uses the top arch to cancel the center column at the station hall level, and due to the force requirements of the middle plate, the center column is provided at the platform level. The roof and floor of the underground excavation station adopts the arching method to solve the force of the long span, and according to the functional requirements, the middle plate is a plane structure. Based on the analysis of the force and economic cost, it is more reasonable to set the support system of the central column and the cent...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the subway station with pillars, and provide a structure and construction method of an underground excavation type arched subway station without pillars. force requirements; the space between the arched middle plate and the straight middle plate is used as the rail top air duct in the station, which meets the station’s use function and solves the problem that the current rectangular track top air duct is difficult to construct

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