Abstract: A method of erecting a wind turbine on a wind turbine site, the wind turbine comprising a turbine tower and a nacelle. The method comprises the following steps: providing a plurality of tower sections being arrangeable upon each other in a vertical orientation in a tower structure to form the turbine tower; providing at least one damper unit configured to dampen oscillations of the turbine tower; attaching a damper unit to one of the plurality of the tower sections on an outside thereof, and subsequently arranging the tower section in the tower structure, and arranging the nacelle on top of the tower structure while the damper unit is attached to a tower section in the tower structure.

Abstract: An alignment tool (1) for aligning a bore (13) extending through a first structural member (14) with a bore (19) extending through a second structural member (15) is disclosed. The alignment tool (1) comprises two shaft portions (2, 3) having a cylindrical or cylindrical like configuration. The second shaft portion (3) is arranged adjacent to the first shaft portion (2). A portion of the second surface forms a continuation of a portion of the first surface. A first bushing (8) is arranged along the first shaft portion (2) and substantially covering the first surface, and a second bushing (9) is arranged along the second shaft portion (3) and substantially covering the second surface. Mutual rotational movements are allowed between the first shaft portion (2) and the first bushing (8) and between the second shaft portion (3) and the second bushing (9).

Abstract: A method of erecting a wind turbine on a wind turbine site, the wind turbine comprising a turbine tower and a nacelle. The method comprises the following steps: providing a plurality of tower sections being arrangeable upon each other in a vertical orientation in a tower structure to form the turbine tower; providing at least one damper unit configured to dampen oscillations of the turbine tower; attaching a damper unit to one of the plurality of the tower sections on an outside thereof, and subsequently arranging the tower section in the tower structure, and arranging the nacelle on top of the tower structure while the damper unit is attached to a tower section in the tower structure.

Abstract: A method for erecting a wind turbine tower is disclosed. A tower section (8) comprising a lower flange (9) and an upper flange (10), and a plurality of stud bolts (6) and nuts (7) are provided. The tower section (8) is oriented in an upright position with the lower flange (9) below the upper flange (10), and stud bolts (6) are positioned in bolt holes (12) in the lower flange (9) with nuts (7) arranged on an upper side of the lower flange (9). The tower section (8) is lifted to a mounting position on top of another tower section (13), and a flange combination is formed by aligning the bolt holes (12) formed in the lower flange (9) of the tower section (8) with bolt holes (15) formed in an upper flange (14) of the other tower section (13), while advancing the stud bolts (6) through the bolt holes (12, 15). The invention further provides a socket tool (16) for screwing nuts (7) onto stud bolts (6) in a manner which positions the stud bolts (6) correctly with respect to a flange (9).

Abstract: A method for handling a wind turbine component (20) is disclosed. The method includes providing a lifting system including a hoist cable (36) and an attachment assembly (38). The attachment assembly includes one or more removable ballast weights (48). The method includes positioning the attachment assembly near a working surface, removing at least some of the one or more ballast weights from the attachment assembly, and attaching a lifting tool (34) to the attachment assembly. The combined weight of the attachment assembly and the lifting tool is sufficiently greater than a threshold weight of the lifting system. The method further includes attaching a wind turbine component to the lifting tool and moving the wind turbine component using the lifting system. A lifting system is also disclosed. The lifting system includes a hoist cable, an attachment assembly, and a lifting tool.

Abstract: The present invention provides a method of erecting a wind turbine on a wind turbine site. The wind turbine comprises a turbine tower and a nacelle. The method comprises the following steps: providing a plurality of tower sections being arrangeable upon each other in a vertical orientation in a tower structure to form the turbine tower, providing at least two damper units configured to dampen oscillations of the turbine tower, attaching one of the at least two damper units to one of the plurality of the tower sections on an outside thereof, and subsequently arranging said tower section in the tower structure, attaching a subsequent one of the at least two damper units to another one of the plurality of the tower sections on an outside thereof, and subsequently arranging said tower section in the tower structure, while the previous one of the at least two damper units is still attached to the previous one of the plurality of tower sections.

Abstract: The present invention provides a method of erecting a wind turbine on a wind turbine site. The wind turbine comprises a turbine tower and a nacelle. The method comprises the following steps: providing a plurality of tower sections being arrangeable upon each other in a vertical orientation in a tower structure to form the turbine tower, providing at least two damper units configured to dampen oscillations of the turbine tower, attaching one of the at least two damper units to one of the plurality of the tower sections on an outside thereof, and subsequently arranging said tower section in the tower structure, attaching a subsequent one of the at least two damper units to another one of the plurality of the tower sections on an outside thereof, and subsequently arranging said tower section in the tower structure, while the previous one of the at least two damper units is still attached to the previous one of the plurality of tower sections.

Abstract: An alignment tool (1) for aligning a bore (13) extending through a first structural member (14) with a bore (19) extending through a second structural member (15) is disclosed. The alignment tool (1) comprises two shaft portions (2, 3) having a cylindrical or cylindrical like configuration. The second shaft portion (3) is arranged adjacent to the first shaft portion (2). A portion of the second surface forms a continuation of a portion of the first surface. A first bushing (8) is arranged along the first shaft portion (2) and substantially covering the first surface, and a second bushing (9) is arranged along the second shaft portion (3) and substantially covering the second surface. Mutual rotational movements are allowed between the first shaft portion (2) and the first bushing (8) and between the second shaft portion (3) and the second bushing (9).