A longitudinal rolling method for large super-heavy steel box girder large segment

By constructing a roadbed-based load-sharing box structure and a multi-dimensional monitoring system, and optimizing the ship load adjustment design, the stability and accuracy issues during the loading of ultra-large and ultra-heavy steel box girders were resolved, enabling the safe and efficient roll-on/roll-off loading of 4700t-class steel box girders.

CN122105968APending Publication Date: 2026-05-29CHINA RAILWAY BAOQIAO (ZHOUSHAN) CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA RAILWAY BAOQIAO (ZHOUSHAN) CO LTD
Filing Date
2026-01-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing roll-on/roll-off (Ro-Ro) technology cannot meet the requirements for safe and efficient loading of ultra-large and ultra-heavy steel box girders. It has problems such as lack of targeted design of Ro-Ro channels, reliance on manual experience to control the height difference between the ship and the dock, crude monitoring methods throughout the process, and insufficient alignment accuracy, making it impossible to achieve stable transfer of 4700t steel box girders.

Method used

By setting up a roadbed loading box structure, optimizing the selection of transport vessels, constructing a quantitative formulaic tidal height threshold calculation system and a multi-dimensional monitoring system, and combining modular vehicle combination forms and hydraulic lifting systems, the longitudinal roll-on operation of large sections of steel box girders is realized by precisely controlling the elevation difference between the dock and the ship deck.

Benefits of technology

The stable roll-on/roll-off of large sections of 4700t steel box girders was achieved, avoiding the risk of roadbed overload damage, improving operational accuracy and efficiency, reducing the adverse effects of tidal fluctuations on operations, and ensuring the safety and efficiency of the loading process.

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Abstract

The application discloses a large-section longitudinal roll-on method for super-large and super-heavy steel box girders, which comprises the following steps: determining a module vehicle combination form and a layout scheme according to steel box girder linear parameters and structural characteristics, and constructing a roll-on channel according to the module vehicle combination form and the layout scheme; screening a transport ship with adaptive load adjusting capacity in combination with tidal characteristics and elevation parameters of a roll-on wharf; quantitatively calculating minimum and maximum tide heights required for roll-on according to the current tidal conditions, ship parameters and real-time environmental monitoring data, determining an operation starting time and a window period; moving the module vehicle to below the steel box girder, and lifting the module vehicle to a preset height through a hydraulic lifting system; controlling the module vehicle to transfer the steel box girder to a specified position of the ship along the channel, and lowering the steel box girder to a deck support block and fixing the steel box girder, then driving the module vehicle to leave along the original channel, and completing the roll-on. The method can stabilize a roadbed through a roadbed load distribution box, determine a roll-on operation window period through calculation, realize accurate load adjustment by matching ship ballast water mutual conversion, reduce manual intervention through linkage monitoring, and adapt to the roll-on requirement of 4700t-level steel box girders.
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