MULTI-PURPOSE HEAVY LIFT VESSEL

摘要

The invention relates to a lifting vessel (1) comprising a first and second hull (2,3) located side by side at a predetermined distance, at least one u-shaped lifting portal (8,9) comprising two vertical legs (33, 34) supported on a respective hull and a transverse leg (14) interconnecting the vertical legs, and connection means (12, 36, 37) for attaching a structure to the transverse leg. Each hull comprises along its length direction a number of ballast (16, 17, 18, 19) tanks at least partially located above water level (W). Each ballast tank comprises an outflow opening (45) above water level, a closure member (20, 46) for closing the ballast outflow and a releasable locking device (21, 48, 51) for maintaining the closure member in a closed position, wherein the locking devices (21, 48, 51) are each connected to a control unit (22) for releasing the locking devices.