| 摘要 |
The present invention relates to a crane vessel and a method of lowering an object from such a crane vessel into the sea. The crane comprises a stationary pedestal, a crane housing that is adapted to slew relative to the pedestal about a vertical rotation axis and a boom, comprising an inner end which is connected pivotably about a horizontal pivot axis to the crane housing. A luffing device extends between the boom and the crane housing, adapted to position the boom and actuate the up-and-down movement of the boom. Furthermore an object suspension device is provided to which an object is connectable, and a hoist assembly which comprises a winch and an associated hoisting cable, the hoisting cable extending from the winch, via a departing sheave on the boom, to the object suspension device, such that upon actuation of the winch the object suspension device can be raised and lowered, wherein the one or more portions of the hoist cable between the boom and the object suspension device form one or more suspension cable parts. According to an aspect of the invention, a hoist cable guide is provided which, at an operational position thereof, is adapted to guide at least one of the suspension cable parts between the boom and the object suspension device. According to another aspect of the invention, the hoisting cable is provided as a multiple fall cable and a hoist cable retention device is provided on the boom. The hoisting cable comprises one or more first suspension cable parts extending between the object suspension device and a radially outward location of the boom, and one or more second suspension cable parts extending between the objection suspension device and a radially inward location, such that the first and second suspension cable parts extend at V-shape with respect to each other, at an angle of preferably between 20 and 60°. |
