Main girder of steel box composite girder with long cantilever arms for single-plane cable stayed bridge

Abstract

The invention relates to a main girder of a steel box composite girder with long cantilever arms for a single-plane cable stayed bridge. The two sides of a steel box girder in the middle of the main girder are respectively provided with a steel cantilever arm, and the steel box girder and the steel cantilever arms are connected by high strength bolts in bolting and welding modes; and the end part of each steel cantilever arm is provided with a longitudinal side beam, the tops of the steel box girder and the steel cantilever arms are paved with concrete bridge decks or cast-in-situ bridge decks, traffic lanes are arranged on the steel cantilever arms, the steel box girder is in a single-box single-chamber structure or multi-chamber structure, and a steel anchor box is arranged at the anchor point of a stayed cable. By adopting the steel box composite girder with long cantilever arms, the stress problems of the main girder, such as the torsion resistance and the like of the single-plane cable stayed bridge, are solved, and the horizontal dimension of the main girder is reduced; the main girder can be transported to the bridge location to carry out erection and installation, thereby solving the problem that the sectional dimension of the appearance is limited; and because most of the components of the main girder are prefabricated ones, the in-situ workload is reduced, and the construction quality and construction period can be effectively guaranteed. The main girder provided by the invention is specially adapted to the construction conditions in severe cold districts, for example, the main girder is applied to the construction of the Wusu Bridge in HeiXiazi Island of Heilongjiang Province, and achieves a good application effect.

Description

technical field [0001] The patent of the present invention relates to a steel box combined girder main girder with a large cantilever used for a single-cable plane cable-stayed bridge. Background technique [0002] The main girders of cable-stayed bridges generally adopt the forms of steel girders, concrete girders, and steel-concrete composite girders. [0003] Steel girders have large spanning capacity, fast construction speed, and high quality reliability. However, steel girders are more expensive. At the same time, the pavement of steel bridge decks with orthotropic slabs is a worldwide problem, and there is no good solution yet. Durability is not easy to be guaranteed, and the maintenance workload in the later period is heavy. Especially in the alpine regions, the snow in winter needs to be removed by spraying deicing agent, etc. The use of steel girders is not conducive to the later anti-corrosion maintenance of the bridge deck system; and because the steel structure ...

AI Technical Summary

Problems solved by technology

[0011] The present invention uses the semi-assembled main girder form of the steel box combined girder with large steel cantilever, which not only solves the stress problem of the main girder such as torsion resistance of the single-cable cable-stayed bridge, but also reduces the stress of the main girder. Horizontal size; the main girder can be erected and installed at the bridge site by land transportation, which solves the problem of limited shape and section size; since most of the main girder is prefabricated, it reduces the amount of on-site work, the construction quality of the structure and the erection period It can also be effectively guaranteed; avoiding the durability of steel bridge deck pavement

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