A rope routing step and a raising step are executed. In the rope routing step, in a state where a raisable and lowerable member and a boom are laid down, a raising rope is coupled to the raisable and lowerable member and routed to extend rearward of the raisable and lowerable member. In the raising step, the raising rope is wound up rearward to raise the raisable and lowerable member. In the rope routing step, the raising rope is routed to pass between a lower restriction section and an upper restriction section of a rope support member, and in the raising step, the raising rope is wound up rearward with a vertical movement of the raising rope restricted by the upper restriction section and the lower restriction section.

A rope routing step and a raising step are executed. In the rope routing step, in a state where a raisable and lowerable member and a boom are laid down, a raising rope is coupled to the raisable and lowerable member and routed to extend rearward of the raisable and lowerable member. In the raising step, the raising rope is wound up rearward to raise the raisable and lowerable member. In the rope routing step, the raising rope is routed to pass between a lower restriction section and an upper restriction section of a rope support member, and in the raising step, the raising rope is wound up rearward with a vertical movement of the raising rope restricted by the upper restriction section and the lower restriction section.

Disclosed is a technique of executing: a fixing step of coupling a pulling-raising rope 171 to a vicinity of a distal end 73 of a strut 70; a first raising step of pulling the pulling-raising rope 171 rearwardly to cause a swingable portion 78 of the strut 70 to swing upwardly and rearwardly; a second raising step of pulling the pulling-raising rope 171 rearwardly until a strut body portion 76 has a rearwardly inclined posture with respect to a vertical direction; a strut returning step of pulling a pulling-returning rope 23a forwardly to a position where a forward swinging movement of the swingable portion 78 with respect to the strut body portion 76 is restricted; and a coupling step of coupling the swingable portion 78 and the strut body portion 76 to each other in a non-swingable manner.

Disclosed is a technique of executing: a fixing step of coupling a pulling-raising rope 171 to a vicinity of a distal end 73 of a strut 70; a first raising step of pulling the pulling-raising rope 171 rearwardly to cause a swingable portion 78 of the strut 70 to swing upwardly and rearwardly; a second raising step of pulling the pulling-raising rope 171 rearwardly until a strut body portion 76 has a rearwardly inclined posture with respect to a vertical direction; a strut returning step of pulling a pulling-returning rope 23a forwardly to a position where a forward swinging movement of the swingable portion 78 with respect to the strut body portion 76 is restricted; and a coupling step of coupling the swingable portion 78 and the strut body portion 76 to each other in a non-swingable manner.

Described is an offshore lifting crane, as for a vessel or platform, that includes a support structure, a crane boom connected to the support structure, a winch drum rotatable around its longitudinal axis, a winch drum drive means, and an elongated hoisting member. The hoisting member includes a first end connected to the winch drum and a second end connectable to a load. The hoisting member extends over at least a part of the crane boom, and the winch drum is arranged such that its longitudinal axis is substantially vertical.

The present invention relates to a lifting assembly (1) for elevating components to a wind turbine (5). The lifting assembly comprises a plurality of tower segments (13) which together form an elongated tower (9), a support frame (11) for supporting the tower (9), a securing assembly (32) securing the tower (9) to the wind turbine (5). The lifting assembly (1) further comprises an upper platform (7) provided with and a crane (21) and vertically movable along the tower (9), and a lower platform (8) provided with a storage area (16) for supporting components and vertically movable along the tower (9) between the upper platform (7) and the support frame (11). The crane is adapted to move components to and from the storage area (16) of the lower platform (8).

A jib coupling system a stowage coupling assembly having a locking member movable between a retracted position and an extended position, an extension pivot coupling system having a coupling member movable between a retracted position and an extended position, and a cable having a first end operably connected to the locking member and a second end having a locking pin. Movement of the locking member from the extended position to the retracted position causes the locking pin to engage the coupling member, and movement of the locking member from the retracted position to the extended position causes the locking pin to disengage the coupling member. The jib coupling system may be implemented as a part of a boom assembly and on a boom assembly of a mobile crane.

A jib coupling system a stowage coupling assembly having a locking member movable between a retracted position and an extended position, an extension pivot coupling system having a coupling member movable between a retracted position and an extended position, and a cable having a first end operably connected to the locking member and a second end having a locking pin. Movement of the locking member from the extended position to the retracted position causes the locking pin to engage the coupling member, and movement of the locking member from the retracted position to the extended position causes the locking pin to disengage the coupling member. The jib coupling system may be implemented as a part of a boom assembly and on a boom assembly of a mobile crane.

A folding structural frame is disclosed, including, a base and a first structural member coupled to the base at a bottom end and extending in a substantially vertical direction when in an operable configuration. A second structural member is coupled to a top end of the first structural member and extending in a substantially horizontal direction when in an operable configuration. An elongated member extends through the second structural member and operable to be removably coupled with an item to be moved by the folding structural frame.

A folding structural frame is disclosed, including, a base and a first structural member coupled to the base at a bottom end and extending in a substantially vertical direction when in an operable configuration. A second structural member is coupled to a top end of the first structural member and extending in a substantially horizontal direction when in an operable configuration. An elongated member extends through the second structural member and operable to be removably coupled with an item to be moved by the folding structural frame.