Steel-concrete composite beam and construction method thereof without guide beam

By employing a guide beam-less construction method that connects longitudinal beams and shear studs in steel-concrete composite beams, the problems of insufficient guide beam stiffness and deflection control in the incremental launching construction of steel-concrete composite beams were solved, enabling rapid bridge construction across complex terrain.

CN118461423BActive Publication Date: 2026-07-24HENAN POLYTECHNIC UNIV
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Patent Information

Application Number
CN202410644409.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-05-23
Publication Date
2026-07-24
Estimated Expiration
2044-05-23

AI Technical Summary

Technical Problem

Existing steel-concrete composite beams have problems during incremental launching construction, such as low guide beam stiffness, difficulty in controlling deflection when the span increases, difficulties in constructing temporary piers, and challenges in hoisting bridge decks, especially when crossing rivers.

Method used

The bridge adopts a multi-section steel box girder spliced ​​together. The longitudinal beams are located on the lower surface of the top plate of the steel box girder and the length of the longitudinal beams matches that of the steel box girder. Adjacent steel box girders bear negative bending moment through the longitudinal beams. The bridge deck is connected by shear studs and micro-expansion concrete. Combined with the longitudinal beams and blocks to assist the upper pier, an arch-shaped structure is formed to enhance rigidity. The bridge is spliced ​​section by section through a guide beam-less jacking construction method.

Benefits of technology

It enabled construction without guide beams, controlled the deflection at the cantilever end, simplified the bridge deck construction, adapted to crossing complex terrain, reduced construction time and costs, and improved construction efficiency.

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Abstract

The application provides a steel-concrete composite beam and a construction method thereof without a guide beam, the composite beam comprising multiple sections of steel box beams spliced with each other, longitudinal beams arranged between two adjacent sections of the steel box beams, the longitudinal beams being arranged on the lower surface of the top plate of the steel box beams, the length of the longitudinal beams being matched with the length of the steel box beams, and the longitudinal beams extending along the length direction of the steel box beams; multiple bridge decks spliced with each other are arranged on the top plate of each section of the steel box beams, and multiple shear studs extending into the bridge decks are arranged on the upper surface of the top plate; wet joints are arranged between two adjacent bridge decks to be integrated by pouring micro-expansion concrete. The longitudinal beams are arranged at the front end of the steel box beams and between the adjacent steel box beams, the longitudinal beams can bear the negative bending moment of the jacking and can assist in jacking the pier, thereby solving the problem of poor stress state of the existing composite beam, the problem of difficulty in controlling the deflection of the cantilever end when the span is increased during the jacking construction, and providing a rapid bridge construction method, facilitating the construction of the bridge deck, and adapting to the jacking construction of crossing rivers, rivers and other terrains.
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