Railroad bridge separated double-box steel main-girder structure with independent air nozzles

Abstract

The invention discloses a railroad bridge separated double-box steel main-girder structure with independent air nozzles. The railroad bridge separated double-box steel main-girder structure comprises a bridge deck system, wherein separated side box girders are arranged on two sides of the transverse bridge direction of the bridge deck system, one side of each separated side box girder is in welded connection with the bridge deck system, and the other side of each separated side box girder is in welded connection with the corresponding independent air nozzle. Each separated side box girder comprises multiple separated side box girder sections arranged in the bridge direction, and the separated side box girder sections adjacent in the bridge direction are spliced through bolts. The designed railroad bridge separated double-box steel main-girder structure is clear in stress, and the local stability problems are few. Compared with integral steel box girders, the structural size is decreased somewhat, the structure can be prefabricated in a factory, field weld joints are avoided, and the construction precision and construction quality are ensured. Compared with steel truss girders, complicated node splicing work is decreased, and the steel consumption is decreased. In addition, the outer surface of the main-girder structure is simple, and the maintenance and repair amount is small. Compared with the integral steel box girders and the steel truss girders, the wind resisting performance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of railway bridges, and in particular relates to a main girder structure which is applied to the field of long-span bridges such as railway cable-stayed bridges and railway suspension bridges, and can also be applied to medium-span railway bridges. Background technique [0002] The main girder structure of existing railway cable-stayed bridges adopts steel truss girders or integral steel box girders. Although the technology of steel truss girders and integral steel box girders is relatively mature, there are still the following imperfections: [0003] (1) For steel truss girders, the cross-section of the main girder is relatively high, and it is difficult to adopt a concrete main girder structure. Therefore, generally the whole bridge adopts a steel structure main girder, which consumes a large amount of steel and is poor in economy; There are too many bolt holes and the slenderness of the weakened members i...

AI Technical Summary

Problems solved by technology

In addition, the entire section of the steel box girder is large in size and inconvenient to transport. Generally, plate units are prefabricated in the factory and assembled and welded on the construction site, resulting in a large amount of on-site welding and certain difficulties in construction quality control.

At the same time, the safety and comfort of trains require that the railway bridge must have a certain local lateral stiffness, and if the long-span railway cable-stayed bridge adopts an integral steel box girder section, the section needs to be widened, resulting in low material utilization and poor economy

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