Covered top-down excavation subway station overlapped wall construction method and movable side wall formwork jumbo

Abstract

The invention discloses a covered top-down excavation subway station overlapped wall construction method and a movable side wall formwork jumbo. The construction method mainly comprises the following steps of: S1, carrying out construction of underground continuous walls; S2, carrying out construction of a top plate and side walls below the top plate; S3, carrying out construction of a middle plate, the side walls above the middle plate and side walls below the middle plate; S4, carrying out construction of the side walls at the middle section of a first ground floor; S5, carrying out construction of a primary bottom plate; S6, carrying out construction of the side walls at the middle section of a second ground floor; and S7, carrying out construction of a secondary bottom plate. According to the method, when the top plate is constructed, the side walls below the top plate are constructed; when the middle plate is constructed, the side walls above the middle plate and the side walls below the middle plate are constructed; and the method has the advantages of high construction efficiency of the side walls at the middle section and high construction quality. The movable side wall formwork jumbo mainly comprises a side wall formwork, a bracket and a movable underframe; the side wall formwork is provided with a concrete pouring port; a chute plate is fixedly arranged above the side wall formwork; and the jumbo has the advantages of reliability of assembling quality of the side wall formwork and convenience for pouring concrete to the side wall sections at the joints of the side walls and the top plate as well as the middle plate.

Description

Technical field [0001] The invention relates to a construction method of a cover-cut and top-down construction of a subway station and a device applied to the method, in particular to a construction method of a superposed wall of a cover-cut and top-down construction of a subway station and a movable side wall formwork trolley. Background technique [0002] When the side wall of the main structure of the subway station and the underground continuous wall adopt the superimposed wall system, the beam main reinforcement, the slab main reinforcement, and the side wall tie reinforcement must be embedded in the underground continuous wall. This kind of embedded reinforcement is not only a quantity In addition, it is easy to cause the embedded bars to be misplaced due to the inaccurate positioning of the reinforcement cage, so that the embedded bars cannot be effectively connected and cannot play their due role, thereby affecting the overall quality of the structure. At the same time, t...

AI Technical Summary

Problems solved by technology

[0002] When the side wall and the underground diaphragm wall of the main structure of the subway station are constructed by cover-excavation, when the laminated wall system is adopted, the main reinforcement of the beam, the main reinforcement of the slab, and the tie reinforcement of the side wall must be pre-embedded in the underground diaphragm wall. Many, and the pre-embedded bars are easily dislocated due to the inaccurate placement of the steel cages, so that the pre-embedded bars cannot be effectively connected and cannot play their due role, thus affecting the overall quality of the structure

At the same time, the station adopts the method of cover and excavation, and the side walls of the first and second floors of the basement are constructed after the top and middle slabs are completed. The concrete of the side wall is constructed by using scaffolding to set up a full hall of brackets. The side wall formwork and brackets need to be installed and disassembled repeatedly. The workload is heavy and time-consuming, which greatly affects the progress of the project. Influenced by the construction process of the method, the concrete pouring operation at the construction joint position at the connection between the side wall and the slab is very difficult and the compactness cannot be guaranteed

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