Railway steel-concrete partial cable-stayed bridge composite beam structure

Abstract

The invention discloses a composite beam structure of a railway steel-concrete partial cable-stayed bridge. When the span of an existing concrete cable-stayed bridge exceeds 300 m, the existing concrete cable-stayed bridge cannot meet the requirement for laying ballastless tracks on a high-speed railway and is safe in operation, and economical efficiency is reduced. Two ends of a stay cable are respectively anchored and connected with a bridge tower and a main beam, the main beam is connected with the bridge tower through a support at the bridge tower, and a pier is arranged below the main beam; the main span part of the girder adopts a steel box girder, the connecting parts of the two sides of the girder and the bridge tower adopt concrete box girders, and the steel box girder and the concrete box girders are in transition connection through a steel-concrete combined section. A steel-concrete partial cable-stayed bridge structure system is innovatively adopted, and the span of a railway partial cable-stayed bridge is pushed to be 300 m or above for the first time; the mid-span section adopts the steel box girder, so that the self weight of the structure is reduced, the girder height of the main girder is reduced, and the concrete shrinkage creep effect is reduced.

Description

technical field [0001] The invention belongs to the technical field of bridge structure construction, and in particular relates to a composite beam structure of a railway steel-concrete partial cable-stayed bridge. Background technique [0002] With the development of high-speed railways, long-span bridges are widely used, and many bridge structures have become local landmark buildings, which put forward higher aesthetic and landscape requirements for bridge structures, and at the same time meet the requirements of navigation, flood control and overpasses. , requires the bridge to have greater spanning capacity. [0003] Due to the high structural rigidity, concrete cable-stayed bridges can well adapt to the laying of ballastless tracks on high-speed railways and meet the needs of operational safety. They are widely used when the span is between 150m and 300m; The creep effect is significant, which cannot meet the needs of ballastless track laying and operational safety of ...

AI Technical Summary

Problems solved by technology

[0003] Due to the high structural rigidity, concrete cable-stayed bridges can well adapt to the laying of ballastless tracks on high-speed railways and meet the needs of operational safety. They are widely used when the span is between 150m and 300m; The creep effect is significant, which cannot meet the needs of ballastless track laying and operational safety of high-speed railways, and the economy is reduced; in order to make some cable-stayed bridges take advantage of their advantages and have a wider application range, in-depth research and development of them are urgently needed Work

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