A method for erecting and/or dismantling a tower, in particular a tower of a wind power installation, comprises providing a climbing crane, erecting the tower by hoisting and fastening tower segments and/or dismantling the tower by detaching and lowering tower segments, implementing, preferably temporary, securing measures for securing the tower in the state of assembly, in particular in the case of expected wind loads on the tower, which comprises taking into consideration the climbing crane, in particular its weight, in implementing the securing measures.

A wind turbine component lifting system for lifting a component of a wind turbine includes a main body with a first and second end, as well as a respective first fastening section for accommodating screws in the area of the first and second ends, wherein the first fastening section has an oblong hole along a longitudinal direction of the main body. The lifting system has a floor plate unit, which has a floor plate with a borehole for accommodating at least one rod, screw, or a bolt. The borehole can be moved transverse to the longitudinal direction.

A nacelle-mounted multiple-appliance lift system has a first lifting appliance and a second lifting appliance mounted in a nacelle of a wind turbine. The first and second lifting appliances are each mounted on main bearing housing securements, gearbox pillow blocks, or both the main bearing housing securements and the gearbox pillow blocks. The first and second lifting appliances share one or both of the main bearing housing securements and the gearbox pillow blocks.

An operations and maintenance arrangement for floating wind turbines (1), comprising a floating sub-structure (2) on which at least one wind turbine unit (3) is situated, a service operation vessel (11) and a portable crane (14), said floating sub-structure (2) having an interface capable of receiving and fixedly locking said crane (14) to said sub-structure (2), said service operation vessel (11) having a ship crane (12) capable of lifting said portable crane (14) from said vessel (11) and onto said sub-structure (2). A method for replacing components using the arrangement is also described.

A crane apparatus of the present invention is configured to install a tower and a wind power generation system and includes an elevation unit configured to be movable upward or downward, and a crane unit configured to raise an element that constitutes the wind power generation system, in which the elevation unit includes upper and lower bases configured to switch between a state in which the upper and lower bases are supported on the tower and a state in which the upper and lower bases are movable, a plurality of posts configured to fix the upper and lower bases to each other, a lifting base configured to switch between a state in which the lifting base is supported on the tower and a state in which the lifting base is movable, and a drive device configured to change distances between the lifting base and the upper and lower bases.

In an upend crane and an installation vessel including such an upend crane, the upend crane is provided with a boom configured for upending wind turbine components, e.g. monopiles and masts. The boom of the crane can be pivoted in an upend position for upending the wind turbine component with the bottom end of the wind turbine component being guided by a cart and a track along an upend deck and with the top end of the wind turbine component being guided along the boom by a trolley and the trolley guide.

A modular wind turbine assembly platform (WTAP) comprises a crane module and at least one work module for temporary storage of wind turbine components, and a modular floating hull assembly platform (FHAP) comprises a crane module and at least one work module for temporary storage of floating platform hull components and a large floating mat, wherein each of the modules comprises a rectangular hull and a plurality of retractable legs with each leg featuring a large-size footing in a water depth of 5 to 15 meters. A method for assembly of a floating offshore wind turbine comprises a floating wind assembly base (FWAB) including the modular FHAP and WTAP deployed at a near-shore site within a distance of 200 to 2000 meters from a shoreline. The method further comprises assembling a floating platform hull and lowering it into the water using the FHAP with the floating mat, then assembling and integrating a wind turbine with the floating platform hull using the WTAP.

A crane apparatus of the present invention is configured to install a tower and a wind power generation system and includes an elevation unit configured to be movable upward or downward, and a crane unit configured to raise an element that constitutes the wind power generation system, in which the elevation unit includes upper and lower bases configured to switch between a state in which the upper and lower bases are supported on the tower and a state in which the upper and lower bases are movable, a plurality of posts configured to fix the upper and lower bases to each other, a lifting base configured to switch between a state in which the lifting base is supported on the tower and a state in which the lifting base is movable, and a drive device configured to change distances between the lifting base and the upper and lower bases.

A nacelle-mounted multiple-appliance lift system has a first lifting appliance and a second lifting appliance mounted in a nacelle of a wind turbine. The first and second lifting appliances are each mounted on main bearing housing securements, gearbox pillow blocks, or both the main bearing housing securements and the gearbox pillow blocks. The first and second lifting appliances share one or both of the main bearing housing securements and the gearbox pillow blocks.

A method for assembling a wind turbine (10) having a first wind turbine component (20) with a first mounting interface (36) and a second wind turbine component (26) with a second mounting interface (34) includes positioning the second wind turbine component (26) relative to the first wind turbine component (20) such that the second mounting interface (34) is located a vertical distance above the first mounting interface (36), aligning the second mounting interface (34) to the first mounting interface (36), lowering the second wind turbine component (36) toward the first wind turbine component (20) to contact each other, and connecting the second mounting interface (34) to the first mounting interface (36). At any time during assembly when the second mounting interface (34) vertically overlaps the first mounting interface (36), the vertical distance between second mounting interface (34) and the first mounting interface (36) is maintained below a predetermined threshold (D). A system for assembling the wind turbine (10) is also disclosed.