Rigid frame-continuous steel-concrete hybrid beam railway bridge structure

Abstract

The invention provides a rigid frame-continuous steel-concrete mixed beam railway bridge structure which comprises a steel box beam located in the middle and concrete beam sections located on the two sides of the steel box beam, the steel box beam is connected with the concrete beam sections through steel-concrete combined sections, the concrete beam section on one side is supported by a rigid arm main pier, and the concrete beam section on the other side is supported by a rigid arm main pier. And the concrete beam section on the other side is supported by a common main pier. On the basis of a traditional concrete continuous rigid frame, a midspan local concrete beam section is replaced with the steel box beam, the beam height is reduced, the self weight is reduced, the spanning capacity is improved, the construction period is shortened, and the economical efficiency is improved. On the basis of a traditional concrete continuous rigid frame, a rigid arm pier is replaced with a traditional pier, the statically indeterminate frequency of the structure is reduced, the adaptability of the structure to loads such as temperature and differential settlement is improved, and the application range of the structure is wider.

Description

technical field [0001] The invention relates to the field of railway bridge engineering, in particular to a rigid frame-continuous steel-concrete hybrid girder railway bridge structure. Background technique [0002] Concrete continuous rigid-frame bridges are widely used in highway and railway bridge projects due to their high structural rigidity, mature construction technology, large spanning capacity, good driving comfort, good durability, and low cost. [0003] In recent years, due to the rapid development of my country's highway and railway industries, especially the rapid development of high-speed railways and rail transit projects, on the one hand, traditional rigid-frame bridges will suffer from diseases such as mid-span deflection and web cracks during long-term operation. On the one hand, the applicability of traditional continuous rigid-frame bridges to temperature and uneven settlement is particularly unfavorable when the piers are low, so traditional concrete cont...

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Problems solved by technology

[0003] In recent years, due to the high-speed development of my country's highways and railways, especially the rapid development of high-speed railways and rail transit projects, on the one hand, traditional rigid-frame bridges will suffer from mid-span deflection and web cracks during long-term operation. On the one hand, because the applicability of traditional continuous rigid frame bridges to temperature and uneven settlement is particularly unfavorable when the pier is relatively short, traditional concrete continuous rigid frame bridges are no longer able to meet the spanning capacity of long-span railway bridges.

Although continuous beam arches and low-tower cable-stayed bridges have appeared that strengthen the traditional concrete continuous beams to improve the spanning capacity, the construction difficulty and construction period have been correspondingly increased, and the project investment has also increased a lot. To transport girders, the bridge deck needs to be made wider, which is less economical. Although some people have proposed to replace the mid-span concrete of traditional continuous rigid frame bridges with lightweight concrete or steel box girder structures to improve the spanning capacity of the structure, However, the problem of poor applicability of rigid frame bridges has not been solved when the piers are too short, and when the concrete section is inconsistent with the steel box girder section, new challenges have been put forward for the structure of the steel-concrete joint section, and the traditional long-span rigid frame The problem of long-term deflection of the bridge also needs to be solved urgently

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