A crane (2) comprising a base portion (4), two arms (6, 8) displaceably connected to the base portion and a lifting boom (22) displaceably connected to the base portion, said lifting boom being provided with a lifting wire (32) and a lifting member (30), for example a lifting hook, for lifting a load, wherein the two arms and the base portion in combination comprise at least three tower flange connection element (10) is arranged to be detachably connectable to cooperating crane connection elements on a flange of a wind turbine tower section, wherein each arm comprises one of the tower flange connection elements, and wherein the vertical distance between any two tower flange connection elements in the normal operating position of the crane is less than 1 m, less than 50 cm or less than 25 cm. In this way a crane is provided which can be attached to a flange located at the upper portion of a tower section.

Provided is a method for moving an object between a platform of a wind turbine and a deck of a vessel, wherein the platform is located at a tower the wind turbine, wherein the object is moved vertically by a hoist coupled between the object and at least one fixation site the wind turbine located above the platform and the deck, wherein the object is deflected radially from the tower by a puller coupled between the object and the vessel.

Provided is a lifting arrangement configured to facilitate alignment of a load with a wind turbine assembly. The lifting arrangement includes a crane arrangement for hoisting the load to the wind turbine assembly, a tagline arrangement for stabilizing the load during a lifting manoeuvre, a sensor arrangement configured to detect a motion of the wind turbine assembly relative to the load during the lifting manoeuvre, an actuator arrangement for adjusting the position of the load relative to the wind turbine assembly, and a control arrangement for controlling actuators of the actuator arrangement to reduce the detected relative motion. Also provided is a method of aligning a load with a wind turbine assembly.

A nacelle for a wind turbine and a method for erecting a wind turbine are disclosed. The nacelle comprises a main unit arranged to be connected to a wind turbine tower, via a yawing arrangement, and at least one side unit mounted along a side of the main unit in such a manner that direct access is allowed between the main unit and the side unit(s), each side unit accommodating at least one wind turbine component, and at least one side unit being capable of carrying the wind turbine component(s) accommodated therein. The main unit and at least one of the side unit(s) are distributed side by side along a substantially horizontal direction which is substantially transverse to a rotational axis of a rotor of the wind turbine. A sufficient interior space of the nacelle is obtained while allowing the nacelle to be transported due to the modular construction. The weight of the wind turbine components is arranged close to the tower due to the transversal arrangement of the side unit(s) relative to the main unit.

The present invention relates to a securing assembly (1) for securing an elongated support tower (2) to a wind turbine tower (3). The securing assembly (1) comprises a base part (1a) including: a tower holding part (4), a fixed part (5), two arms (6), a plate (6c) arranged at the outer part of each of the two arms (6), the plates (6c) can adapt to the curvature of the wind turbine tower (3) and each comprising at least one rope sliding element (9). The securing assembly (1) comprises a rope (8), being arranged via the rope sliding elements (9), and a rope tightening device (11) arranged on the base part (1a). The rope (8) presses the plates (6c) against the wind turbine tower (3) when tightened.

Methods and apparatuses 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.

Provided is an eco-friendly wind power generation apparatus that can perform power generation using wind by providing the blades of a wind power generator on a jib of a tower crane, and can perform wind power generation at the optimum altitude and in the optimum direction by automatically or manually performing the lifting or lowering and swing operation of a jib even when wind speed is insufficient because wind is not blowing, or perform wind power generation using artificial wind power generated by the operation of the jib, thereby generating a lot of electricity in necessary places and supply the electricity to all industrial sectors regardless of location and environment.

An extension yoke (1), a self-hoisting wind turbine crane (5) with such a yoke a method of using such a yoke are disclosed. The yoke comprises a frame structure comprising a lifting portion (2) and a load transfer portion (3), forming an obtuse angle with each other, and at least one crane attachment element (4) positioned between the load transfer portion and the lifting portion, said at least one crane attachment element being configured for establishing a pivot connection to a crane. The lifting portion comprised a load attachment element (2) and the load transfer portion comprise at least one load transfer element (33), said load transfer element being configured for transferring compressive force by pressing against a reception surface (52) of the crane and for moving in relation to the reception surface. The frame structure may comprise at least two substantially parallel longitudinal beams (12a, 12b), at least one cross-beam (13), and/or at least one stabilisation element (12), and the crane attachment element may comprise a pulley block reception element.

A crane system for moving a burden, such as a wind turbine component, between the nacelle or rotor of a wind turbine and a location at a lower end of the wind turbine at a distance from the wind turbine, wherein the crane system includes a crane, said crane being adapted to be mounted near or in the nacelle of the wind turbine, wherein said crane includes a boom and wherein the crane has at least one rotational axis, about which sections of the crane can rotate. The disclosure further relates to a method for moving a burden, such as a wind turbine component, between the nacelle or rotor of a wind turbine and a location at a lower end of the wind turbine at a distance from the 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.