Wide-span girder main beam structure, combined formwork system and construction method for cable-stayed bridge

Abstract

The invention provides a wide-span girder main beam structure, a combined formwork system and a construction method for cable-stayed bridge. The main beam structure includes a longitudinal beam, a horizontal beam and a bridge deck. The longitudinal beam and the horizontal beam are connected to form a beam, and the bottom plate and the web of the main longitudinal beam are connected by an invertedcircular arc surface. The cross beam along the cross bridge includes a cantilever plate section, a longitudinal beam section and a longitudinal beam connecting section. The underside surface of the cantilever plate section is a curved concave transition surface. The cross section of the longitudinal beam connection section is T-shaped, and the web is a variable section web. The combined formwork system comprises a support system and a formwork system, and the formwork system of the beam comprises a cantilever plate section formwork system, a through-span section formwork system and a longitudinal beam joint section formwork system. The stencil system of the main stringer includes a bottom plate system, a web system, and a chamfering system at the location where the backing system is connected to the web system. The main beam structure, combined formwork system and construction method ensure the design specification requirements. The main beam structure has the advantages of light weight, flexible processing and assembly, quick installation and disassembly, which is suitable for the installation of prestressed tension and stay cables of the main beam.

Description

technical field [0001] The invention relates to a cable-stayed bridge, in particular to a wide beam lattice main girder, a formwork system and a construction method thereof. Background technique [0002] A cable-stayed bridge is a composite bridge structure system composed of three basic components: tower columns, main girders, and cables. The performance of the overall structure is affected in different ways by tower columns under compression, main girders under bending, and stay cables under tension. Compared with bridges of other systems, due to the support of cables, the main girder of cable-stayed bridges has the characteristics of large spanning capacity, small building height, and adjustment of the internal force of the main girder by means of the prestress of cables. From the composition characteristics of the cable-stayed bridge, it can be known that the main girder, the cables, the cable towers and the vertical and horizontal connection systems are jointly stressed...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of cable-stayed bridge wide beam lattice main girder structure, combined formwork system and its construction method, to solve the problem that the existing construction period is long and the quality of concrete cannot be guaranteed; High, the joints at the chamfers of many beam lattices are not easy to be tight, the operation on high supports is difficult, and there are technical problems of potential safety hazards; it is also necessary to solve the follow-up prestressed tensioning of the main beam and installation of cables, and the steel formwork side forms are not easy to disassemble temporarily placement technical issues

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