Steel trussed beam and flexible arch bridge construction method with vault pushing

Abstract

The invention discloses a steel trussed beam and flexible arch construction method with vault pushing, which comprises the following steps of: building an assembly support in the side span of a steel trussed beam, assembling a guide beam and the steel trussed beam into an integral space on the assembly support, arranging a horizontal continuous jack and a mechanical, electrical and hydraulic control system on the assembly support, pushing the steel trussed beam forward by using the horizontal jack, and continuing next round of assembly work on the rear assembly support whenever one round is pushed forward. By using the steel trussed beam and flexible arch construction method with vault pushing provided by the invention, the steel trussed beam and the flexible arch are erected outside the operating limit of a highway, and the construction difficult across the highway is solved.

Description

technical field [0001] The invention specifically relates to a steel truss flexible arch bridge with vault push construction method, which is particularly suitable for the erection construction of large-span continuous steel truss flexible arch bridges spanning highways, railways and rivers, and belongs to the technical field of bridge construction. Background technique [0002] As a structural type of long-span steel truss bridges, flexible arch bridges with steel truss girders have the advantages of large vertical rigidity, clear structural stress, novel design, and beautiful architectural shapes. They are used in some bridges spanning highways, railways, and rivers. . At present, the construction methods of long-span steel truss girder flexible arch bridges are mostly two-way cantilever assembly, middle closing, and beam-first arching methods. According to its structural characteristics, environmental factors, and boundary conditions, construction auxiliary facilities an...

AI Technical Summary

Problems solved by technology

However, continuous provision of temporary piers in the middle of the expressway cannot pass the traffic safety assessment

[0006]2. Temporary piers are used to assist two-way cantilever construction to close the middle of the span. It is necessary to construct large foundations for temporary supports on the shoulders on both sides of the expressway, and road and driving safety cannot be guaranteed.

[0007]3. The sling tower assists two-way cantilevered mid-span closure, and there is no need to set up temporary piers within the expressway limit, but the sling tower is a huge Special equipment, complex structure, high cost

[0008]4. The above three schemes need to hang rods above the expressway. The safety protection of road-related construction is complex and changeable, and it is difficult to guarantee the operation safety of the expressway

[0010]1. Due to the large span of the steel bridge and the downward deflection caused by the self-weight of the steel truss girder, it is necessary to adjust the alignment of the steel girder by jacking up the girder and prevent the steel truss girder from Instability of members and local overstress, complicated strengthening measures

[0011]2. The mid-span closure scheme of the beam first and then the arch needs to be operated at a height of 75m above the expressway, which is difficult to operate and has high safety risks

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