A method for connecting a blade to a hub of a wind turbine, the method including pulling the blade towards the hub using a rope guided through an interior of the hub is provided. Thus, movements between the hub and the blade, in particular due to oscillations or waves, are reduced during the connection process.

The present invention relates to a hydroelectric turbine recovery system, and in particular a system which significantly reduces the complexity of recovering a base mounted hydroelectric turbine from a deployment site on the seabed by providing a frame having an open mouth which can be advanced around the turbine before the frame is fully lowered into locking engagement with the base, thereby allowing the base, with the turbine thereon, to be recovered from the seabed.

There is provided a wind power installation rotor blade having a rotor blade root, a rotor blade tip, a rotor blade leading edge, a rotor blade trailing edge, a pressure side and a suction side. The rotor blade further has a rotor blade outer casing with at least one opening in the pressure and/or suction side for receiving handling means for fitting or removing the rotor blade. The rotor blade also has at least one fixing unit for fixing the handling means which are introduced through the at least one opening. The fixing unit is arranged in the interior of the rotor blade outer casing between the pressure side and the suction side.

A method (100) of mounting a blade (22) to or unmounting a blade (22) from a rotor hub (20) of a wind turbine (10), the wind turbine (10) comprising a tower (12) and a nacelle (16) mounted on the tower (12), the rotor hub (20) being coupled to the nacelle (16), the method (100) comprising gripping the blade (22) using a gripper (50), the gripper (50) comprising gripping members (58) configured for gripping the blade (22) and teeth (60) protruding from the gripping members (58), wherein gripping comprises inserting the teeth (60) of the gripper (50) into receptacles (78) of the blade (22); and rotating the blade (22) about a rotation axis (54) perpendicular to a longitudinal blade axis (53) using a blade rotation device (52) of the gripper (50), wherein the teeth (60) are configured for transmitting an axial load (57) of the blade (22) between the blade (22) and the gripping members (58).

A method for mounting or dismounting a wind turbine component of an energy generating unit in a multirotor wind turbine is disclosed. The multirotor wind turbine comprises a tower configured to support one or more load carrying structures each arranged for supporting at least two energy generating units arranged at or near its ends and at opposite sides of the tower. The method comprises securing the load carrying structure against up and down tilting movements before positioning or dispositioning the wind turbine component at an end of the load carrying structure thereby reducing the loadings arising from the unbalance caused by the positioning or dispositioning the wind turbine component. The securing may be realized by compression bars, tethering, or the use of a counterweight.

A method for mounting a blade root of a blade on a blade flange of a wind turbine rotor, the method comprising:—attaching a control line between a hold structure at the blade flange and the blade root; —lifting the blade with a blade lifting crane while the blade root is guided towards the blade flange by use of said control line, and—connecting said blade root to said blade flange.

A method for mounting a blade root of a blade on a blade flange of a wind turbine rotor, the method comprising: attaching a control line between a hold structure at the blade flange and the blade root; lifting the blade with a blade lifting crane while the blade root is guided towards the blade flange by use of said control line, and connecting said blade root to said blade flange.

A handling device for a transmission includes a first pillar, a second pillar, a first receptacle for the transmission and a second receptacle for the transmission, and a first rail and a second rail. The first receptacle is fixed in the first pillar so as to be rotatable and translationally displaceable. The second receptacle is fixed in the second pillar so as to be rotatable and translationally displaceable in parallel to the first receptacle. The first pillar is fixed in the first rail so as to be translationally displaceable. The second pillar is translationally displaceable in the second rail in parallel to the first pillar. The axes of rotation of the receptacles are aligned or oriented such that they can be brought into alignment by displacing the first receptacle, the second receptacle, the first pillar and/or the second pillar.

The present invention relates to a system and method for cutting and manipulating the used wind turbine blades for disposal.

An apparatus and a method for relieving a tension strand, in particular a tension strand of a prestressed tower, preferably a prestressed concrete tower of a wind power plant. Furthermore, the disclosure relates to a method for dismantling a prestressed tower and to the use of an apparatus. The apparatus comprises a first anchoring unit with a first tension strand receptacle for a first section of the tension strand, a second anchoring unit with a second tension strand receptacle for a second section of the tension strand, and a lifting unit which is configured to change a spacing between the first and second anchoring unit.