Adjustable gap steel box girder connection device suitable for long-span cable-stayed bridges

By using a modular filler plate system and high-strength bolt connections, the problems of insufficient gap adjustment accuracy and stiffness in the connection of steel box girder segments of long-span cable-stayed bridges have been solved, achieving efficient and safe beam segment connection and adapting to harsh construction conditions.

CN224514068UActive Publication Date: 2026-07-17SICHUAN ROAD & BRIDGE CONSTRUCTION GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SICHUAN ROAD & BRIDGE CONSTRUCTION GROUP CO LTD
Filing Date
2025-08-27
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

When connecting steel box girder segments in long-span cable-stayed bridges, there are problems such as low precision in gap adjustment, insufficient connection stiffness, and low construction efficiency, especially during cantilever assembly, where they are prone to loosening and wear.

Method used

An adjustable gap steel box girder connection device is adopted, which uses a modular filling plate system and high-strength bolts for connection, combined with steel strand tensioning, to achieve millimeter-level gap fine adjustment and posture correction, ensuring connection stiffness and stability.

Benefits of technology

It achieves precise adjustment of gaps down to the millimeter level, improving construction efficiency and connection rigidity, enhancing the safety and adaptability of bridge structures, and making them suitable for various construction conditions.

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Abstract

This utility model discloses an adjustable gap steel box girder connection device suitable for long-span cable-stayed bridges; it includes: a temporary connecting matching steel box girder and a temporary connecting steel box girder to be installed; the joint between the segments of the temporary connecting matching steel box girder and the temporary connecting steel box girder to be installed has a buffer and anti-collision connection joint; wherein, the temporary connecting matching steel box girder and the temporary connecting steel box girder to be installed are respectively composed of a top plate, a bottom plate, a web plate, a stiffening plate, and a guardrail steel plate; wherein the top plate, bottom plate, and web plate are welded to form a whole corresponding to the steel box girder, stiffening plates are welded to the two ends of the whole, and guardrail steel plates are welded to the bottom surface of the two ends of the whole, and are connected to the guardrail by pre-embedded bolts. This patent provides a multi-functional connection device that can be quickly adjusted during cantilever assembly and matching while maintaining high-strength connection performance, ensuring the connection accuracy of beam segments, structural safety, and construction efficiency.
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