Subway station extension method and structure based on concrete-filled steel tube beam insertion method

Abstract

The invention relates to a subway station extension method and structure based on a concrete-filled steel tube beam insertion method. The subway station extension method comprises the steps that a transverse through middle platform is built between existing bidirectional parallel shield tunnels to form an extension structure; and corresponding upper through holes and lower through holes are obliquely formed in segments of the two shield tunnels, jacking bent steel pipes are inserted from the through holes to be transversely connected to serve as external supports, a lining structure is constructed after soil is excavated on the inner side, and through connection is achieved after the segments at shield tunnel connectors are detached. Small expansion, downward storey addition and step-by-step expansion can be achieved, and the subway station extension method is suitable for expansion of subway stations with strict control over ground displacement and ground surface settlement and construction of shallow soil, soft stratums and large-span underground spaces.

Description

technical field [0001] The invention relates to the technical field of subway station engineering construction, in particular to a subway station extension method and structure based on a steel pipe concrete beam insertion method. Background technique [0002] The shield tunneling method has become an important construction method in the construction of subways in my country, and has become a preferred method. However, problems such as too short division of shield construction sections, low utilization rate of equipment, and long waiting time for shield machines have restricted the development and application of shield technology in my country. One of the main reasons for these problems is that there is no good Solve the contradiction between the construction of the shield section and the construction of the station in terms of construction speed and organization. [0003] Chinese patent ZL201310468894.2 discloses a construction method for the expansion of the main structure...

AI Technical Summary

Problems solved by technology

However, problems such as too short division of shield construction sections, low utilization rate of equipment, and long waiting time for shield machines have restricted the development and application of shield technology in my country. One of the main reasons for these problems is that there is no good Solve the contradiction between the construction of the shield section and the construction of the station in terms of construction speed and organization

[0003] Chinese patent ZL201310468894.2 discloses a construction method for the expansion of the main structure of the existing subway station, which mainly uses a plurality of dewatering well pipes to carry out dewatering construction until the groundwater under the floor is reduced to the design depth. In the widening construction, the underground enclosure structure is supported by the force conversion method of slabs instead of braces. However, this expansion method seriously breaks the ground, which will cause large deformation of the subway and the surrounding soil, and may even cause stratum subsidence and existing Sabotage of operating subways, resulting in major safety incidents

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