A marine heavy-load low-clearance amplitude type hoisting and lifting construction method

By adjusting the L-shaped boom and spreader combination of the crane vessel, and combining the staged lowering method of the motorized hook and auxiliary hook, the problem of lifting complex linear steel beams at sea was solved, and the safe and efficient lifting of large-segment, heavy-duty steel beams was achieved, adapting to diverse working conditions.

CN115744658BActive Publication Date: 2026-05-26CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP CO LTD +1
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Patent Information

Application Number
CN202211038546.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-29
Publication Date
2026-05-26
Estimated Expiration
2042-08-29

AI Technical Summary

Technical Problem

Existing technologies are insufficient for efficiently lifting complex and diverse steel beam segments in offshore construction, especially under aviation height restrictions, where conventional crane vessels are ill-suited to the lifting requirements of large segments and heavy loads.

Method used

The offshore heavy-load, low-headroom variable-amplitude lifting method is adopted. By adjusting the luffing angle of the L-shaped boom of the crane vessel and using a combination of lifting tools, the steel beams are lowered slowly in stages. Combined with the cooperation of motorized hooks and auxiliary hooks, the safe lifting of various types of steel beams is achieved.

Benefits of technology

It enables safe and efficient hoisting of large-segment, heavy-duty steel beams under aviation height restrictions, adapts to diverse working conditions, and improves construction efficiency and safety.

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Abstract

This invention provides a method for heavy-load, low-headroom, variable-amplitude lifting and hoisting at sea. First, the crane vessel is inspected. Then, after arriving at the beam-retrieving position, the crane vessel is anchored and positioned, and the L-shaped boom angle of the crane vessel is adjusted accordingly. The beam-carrying vessel is positioned at the beam-retrieving point on the crane vessel for beam feeding. The beam is then lifted, and the crane vessel is moved forward to the beam-lowering position by tightening the bow anchor or forward cable. After moving forward to the position, the height difference between the two sides of the steel beam along the bridge direction is adjusted according to the design drawings. After the crane vessel moves forward and the height difference is adjusted, the beam is lowered. As the weight of the steel beam gradually shifts from the crane vessel to the supports, the lifting equipment is removed, and finally, the crane vessel withdraws. This invention can adapt to diverse working conditions. The variable-amplitude angle adjustment is suitable for low-headroom hoisting of steel beams with varying widths, diverse structures, large segments, and large lifting capacities at sea, ensuring the safety of steel beam segment hoisting.
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