UHPC small box girder structure

Abstract

The invention discloses an UHPC small box girder structure. The UHPC small box girder structure comprises multiple box girder bodies connected with each other through longitudinal joints; the box girder bodies are prefabricated by ultra-high performance concrete; the box girder bodies consist of top plates, bottom plates, web plates, midspan diaphragms and end diaphragms; retard-bonded prestressedtendons are embedded in the box girder bodies in a longitudinal direction; internal side templates and external side templates which are fixedly connected with each other through bolt connecting pieces are arranged in the end parts of the box girder bodies; the end diaphragms are integrally poured between the internal side templates and the external side templates; and the box girder bodies are thin-walled box girders consisting of UHPC materials. Materials are effectively saved, the girder weight is reduced by about 40%, the retard-bonded prestressed tendons are embedded in the box girder bodies so that the materials are saved and the girder height is reduced; corrosion and changing problems of external prestressed tendons are avoided; and the maintenance cost in the operation period isgreatly reduced.

Description

technical field [0001] The invention relates to the technical field of bridge engineering structures, in particular to a UHPC small box girder structure. Background technique [0002] In recent years, my country has actively explored and enriched green bridge construction methods with high speed, low road interference and quietness, vigorously advocated prefabricated construction of bridges, and actively explored the application of new materials in prefabricated bridges, and built a large number of representative bridges. The prefabricated bridges, industrialized production and prefabricated construction of bridges have become a major trend. [0003] Although there are various types of prefabricated bridges, they all have their own shortcomings: the steel structure has a large amount of on-site welding (bolts), and the steel bridge deck has fatigue cracking problems; the steel-concrete composite structure has a large self-weight, and the bridge deck can only partially Prefab...

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Problems solved by technology

[0003] Although there are various types of prefabricated bridges, they all have their own shortcomings: the steel structure has a large amount of on-site welding (bolts), and the steel bridge deck has fatigue cracking problems; the steel-concrete composite structure has a large self-weight, and the bridge deck can only partially Prefabrication, large amount of on-site pouring; prestressed reinforced concrete structure is heavy, the horizontal connection is easy to be damaged, and there are many durability diseases

UHPC materials have been greatly developed in the field of bridges in countries such as France and Malaysia, but in my country, their theoretical research is mostly concentrated in the three forms of T-beam, wide box girder and π-beam, and the research on UHPC small box girder is basically It is blank, but the T-beam structure has many horizontal connections, and there are many joints on site, which is not conducive to rapid construction; the wide box girder realizes prefabricated construction through the longitudinal division of the box girder, and the on-site construction work is heavy and complicated; the π-beam There are only longitudinal joints on the bridge deck, which is convenient for on-site construction, and the prestressing force is cancelled, which avoids the difference in the anti-arching of the main girder caused by the prestressing tension, thereby ensuring the quality of the transverse joints and reducing the thickness of the bridge deck pavement. Lack of prestress leads to bridge span limitation

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