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

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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