Weldless small box girder wet joint structure and method adopting ultra-high performance concrete

Abstract

The invention discloses an ultra-high performance concrete wet joint structure with prefabricated small box girders and a construction method of the ultra-high performance concrete wet joint structure. The wet joint structure comprises a plurality of prefabricated small box girders, wherein each prefabricated small box girder is arranged along the bridge direction, and a wet joint along the bridgedirection is formed between two adjacent prefabricated small box girders; a bridge deck slab straight section is arranged at the top of the prefabricated small box girder, a plurality of annular reinforcing steel bars are pre-buried in the bridge deck slab straight section, each annular reinforcing steel bar is arranged in the transverse bridge direction, and the annular ends of the annular reinforcing steel bars extend into the wet joints; a plurality of constructional steel bars are arranged in the wet joint, and each constructional steel bar is arranged in the bridge direction; ultra-high-performance concrete is poured into the wet joints, the constructional steel bars and the annular steel bars extending into the wet joints are wrapped in the ultra-high-performance concrete, and everytwo adjacent small prefabricated box girders are connected into a whole through the ultra-high-performance concrete of the wet joints and the annular steel bars wrapped in the ultra-high-performanceconcrete. According to the invention, the construction procedure can be simplified, the construction efficiency is improved, the manufacturing cost is reduced, and the construction quality is effectively improved.

Description

technical field [0001] The invention relates to bridge structure technology, in particular to an ultra-high performance concrete (UHPC) wet joint structure of a prefabricated small box girder and a construction method thereof. Background technique [0002] In the field of bridge construction, precast concrete small box girders are widely used in bridge construction in my country. The design methods and construction techniques are mature. Precast concrete small box girders have the characteristics of fast construction speed and high degree of industrialization. Wet joints should be reserved between two prefabricated small box girders. The wet joint structure must be able to accurately transmit internal forces such as bending moment and shear force, and it is also an important structure to ensure the overall mechanical performance of the structure. [0003] In the traditional wet joint structure of precast concrete small box girders, pre-embedded annular connecting bars are mo...

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Problems solved by technology

[0004] When this connection method is applied to large-scale prefabricated concrete small box girders, there will be the following problems: (1) the welding workload of wet joint lapped steel bars is huge, and the labor cost and time cost of the project are high; (2) pre-embedded The on-site welding quality of the steel bars is poor. When the position deviation of the steel bars reserved for the bridge deck is difficult to correct on site, the construction process is cumbersome and the construction quality cannot be guaranteed.

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