Segmental prefabricated steel pin diaphragm UHPC box girder and construction method thereof

By introducing longitudinal steel bars and steel pin diaphragms into the UHPC box girder, the problems of large steel consumption and complex structure of existing UHPC box girders are solved, achieving low-cost and efficient construction and resistance to torsion and distortion, which is in line with engineering practices.

CN117328334BActive Publication Date: 2026-06-19HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN UNIV
Filing Date
2023-09-11
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing UHPC box girders have problems such as large steel consumption, complex structure, inconvenient demolding and high cost during construction, and they are not in line with traditional design and engineering application habits.

Method used

The UHPC box girder with segmental prefabricated steel pin diaphragm is adopted. By setting longitudinal structural steel bars and steel pin diaphragms in the UHPC box shell, the steel pin structure is embedded in the UHPC box shell and interlocks with it. The upper, lower, left and right side steel plates of the steel core are eliminated, and steel pin diaphragms are used to replace conventional UHPC diaphragms, simplifying the connection structure and reducing the amount of steel used.

Benefits of technology

It significantly reduces steel consumption, simplifies the structure, lowers costs, improves construction efficiency, facilitates formwork removal, and maintains resistance to torsion and distortion, thus conforming to engineering application practices.

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Abstract

This invention discloses a segmental precast steel pin diaphragm UHPC box girder and its construction method. The girder includes a UHPC box-shaped outer shell, within which are arranged multiple longitudinal structural steel bars extending along the beam length and spaced apart. Inside the UHPC box-shaped outer shell are multiple steel transverse diaphragms arranged at intervals along the beam length. The edges of the steel transverse diaphragms are fitted against the inner wall of the UHPC box-shaped outer shell. Multiple steel pin structures are connected to the steel transverse diaphragms to form steel pin-type diaphragms. Each steel pin structure is arranged at intervals along the edge of the steel transverse diaphragm and is embedded in the UHPC box-shaped outer shell, engaging with it. This segmental precast steel pin diaphragm UHPC box girder has the advantages of simple structure, low steel consumption, and low cost.
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