Methods for onshore or offshore erecting an upstanding construction comprising longitudinal construction parts, comprising the steps of providing the longitudinal construction parts, transporting the longitudinal construction parts on a vehicle to an erection site, providing a crane for hoisting the longitudinal construction parts, using the crane for placing the respective longitudinal construction parts on top of each other on a construction base at the erection site, providing the construction base and/or the longitudinal construction parts with a support and guide facility for the crane, arranging that the crane is mountable on the support and guide facility, and mounting the crane on the support and guide facility of at least one of the construction base and the longitudinal construction parts that is placed on the construction base, so as to arrange that the crane is movable up and down along the support and guide facility of the construction.

A hoisting system for the at least one of an installation, a decommissioning and a maintenance of a wind turbine which comprises at least a foundation, a tower, a yawing part and a rotor of at least 80 m diameter with at least one blade, comprising a first hoisting device which comprises measures to establish a load carrying joint with an already built part of the wind turbine which is located above the foundation, wherein the hoisting system is characterized in that the ratio between the maximum hoist load of the hoisting device and the mass of the heaviest part is larger than 0.2 and smaller than 1 and in particular smaller than 0.8 and more in particular smaller than 0.7 and preferably smaller than 0.6, with the heaviest part being a heaviest part which is hoisted as one piece and which belongs to the yawing part of wind turbine.

A lift system mountable in a nacelle of a wind turbine has a mounting interface removably securable to a generator in the nacelle of the wind turbine, and a knuckle boom rotatably and removably mounted on the mounting interface. The knuckle boom has an extendable boom arm having a translatable boom section slidably mounted on the boom arm. Modularity of the lift system permits lifting components of the lift system up to the nacelle using an existing service crane of the wind turbine, and rapidly dismounting the knuckle boom to permit closing doors of the nacelle in the event of inclement weather without dismounting all of the lift system components.

A method (800,900) of assembling or disassembling a rotor blade of a wind turbine, the wind turbine comprising a tower, a nacelle mounted on the tower and a rotor coupled to the nacelle, the rotor having a rotor hub and a rotor blade, the rotor blade comprising a first blade segment connected with the rotor hub, a second blade segment, wherein the second blade segment is configured for joining to the first blade segment such that the second blade segment extends from the first blade segment towards a blade tip of the rotor blade, and a releasable locking device configured for joining the second blade segment to the first blade segment, the releasable locking device comprising a structural member of the second blade segment, the structural member being configured for engaging a further structural member of the first blade segment for releasable locking with the further structural member, wherein a fastening device of the second blade segment is arranged on the structural member; the method comprising raising (950) or lowering (860) the second blade segment using a connecting device fastened to the fastening device of the second blade segment, wherein the connecting device extends through a root of the rotor blade and at least partially through the first blade segment to the second blade segment.

The invention provides a lifting assembly comprising a support structure (4) arranged to support a load (2) suspended from the support structure, a guide line (501) arranged to extend from a first location, to a second location, a wheel assembly (601) with one or more wheels (621, 622, 623) arranged to engage, and roll along, the guide line (501), and a control line assembly (701) arranged to extend from the wheel assembly (601) to the load (2), wherein the lifting assembly comprises a retainer (801) arranged to connect, between the first and second locations, the guide line (501) to the support structure (4).

Tower erection systems and methods utilizing a load-sharing support member (LS support member) are disclosed. The LS support member can have a first end coupled to a crane tower and a second end configured to repeatably couple to the upper-most tower section of a partially assembled tower stack during assembly. During lifting, a portion of the vertical load is transferred to the partially assembled tower stack.

The disclosure relates to a crane (200) for erecting a tower including a plurality of tower segments (171, 72, 173, 174, 175), the crane (200) comprising: a telescopic mast (210), and a jib (230) rotatably mounted with respect to the telescopic mast (210) and comprising lifting equipment (240). The telescopic mast (210) comprises a lower mast segment (211) having one or more lower clamp assemblies (202, 204) for selectively gripping portions of the tower and a roller assembly (300) for rolling along the tower, and comprising one or more further mast segments (212, 213, 214, 215, 216) having an upper clamp assembly (206) for selectively gripping portions of the tower, the further mast segments (212, 213, 214, 215, 216) being slidable with respect to the lower mast segment (211). The disclosure also relates to methods for climbing a tower with a crane (200) and methods for mounting a wind turbine tower.

An equipment for installing and dismantling of a wind turbine system including a tower, a nacelle and a blades is capable of self-climbing along the tower via upper and lower grippers moving up and down the supporting frame equipped with two booms along the tower. The two booms aren't able to turn around in horizontal plan but are able to hoist, for example, the nacelle and pivot it to the top of the tower before placing it on the positioning frame. In order to combine the nacelle to the tower, the nacelle resting on the positioning frame shall be adjusted to the location of the tower in horizontal plan before the positioning frame is lowering it to the tower.

A method for making a nacelle and a nacelle for attachment to a wind turbine tower. The method comprising providing a main frame configured to form a load path from a drive train to the wind turbine tower, providing, on the main frame, a mounting structure for mounting a crane, providing a crane for mounting on the mounting structure, and mounting the crane to the mounting structure before the nacelle is attached to the wind turbine tower. The crane can then be used for assembly operation before the nacelle is attached to the wind turbine tower, e.g. at an assembly facility away from the tower where the wind turbine is erected.

A lift system mountable in a nacelle of a wind turbine has a boom having a proximal end mountable in the nacelle and a distal end extending over a hub of a rotor of the wind turbine when the lift system is mounted in the nacelle. The lift system has a frame structure for mounting the proximal end of the boom in the nacelle, a winch mounted to the boom, a fastener situated below the boom and operatively connected to the winch by at least one cable, and a trolley movably mounted to the boom to permit translation of the trolley longitudinally along the boom thereby permitting longitudinal movement of the fastener with respect to the boom.