A tower arrangement for a wind turbine, including: a guyed tower, cable foundations each including a through-hole, one or more stay cables, each stay cable being anchored at its first end at the tower and being anchored at its second end at one of the cable foundations, and one or more anchoring means for anchoring the second end of each stay cable at the respective cable foundation, wherein each stay cable is guided through a respective through-hole and anchored, with respect to its first end, behind the respective through-hole at its second end using the anchoring means is provided. By having the cable foundations comprising the through-holes, guiding the stay cables through the through-holes and anchoring them behind the through-holes, external connection means such as steel structures poured into the concrete foundation are not required. Thus, the anchoring of the stay cables at the cable foundations is simplified.

A method of assembling a wind turbine tower by stacking a plurality of annular sections made of concrete above each other. The main connections are performed between two adjacent annular sections, for withstanding loads induced by a rotor. The auxiliary connections are performed between two adjacent annular sections, for withstanding loads induced by an earthquake and loads induced by the wind on the wind turbine in absence of the rotor, but not necessarily loads induced by the rotor. The method is characterized in that the auxiliary connections between two adjacent annular sections are performed prior to stacking the following annular section.

The present disclosure is related to a device 100 configured for aligning a first hole 131 of a first flange 130 with a second hole 141 of a second flange 140. The device 100 comprises a base 101, a shaft 110 extending from the base 101 and a first and a second pusher 115, 116. The shaft 110 is configured to move between a retracted position and an extended position. The shaft 110 in the extended position extends from the first hole 131 into the second hole 141. The first and second pushers 115, 116 are also configured to be moved radially outwardly from the shaft 110 to exert pressure against an inner wall of the first and second holes 131, 141. Methods for aligning a first and a second hole 130, 140 are also provided.

A telescopic wind turbine tower includes a base, a telescopic tubular tower, a wind turbine assembly, and one or more jacking systems. The telescopic tubular tower is configured with a bottom section and one or more upper sections. The bottom section is concentrically mounted onto the base. The upper section or sections are slidably engaged to the bottom section through one or more jacking systems. The wind turbine assembly is mounted onto a top section from the upper sections and as the telescopic tubular tower is positioned between the base and the wind turbine assembly.

A wind turbine tower including a plurality of annular segments axially aligned with each other, at least one of the annular segments having a plurality of assembled sectors made of precast concrete, adjacent sectors of this segment being assembled by clamping devices and the segment comprising at the interface of adjacent sectors shear keys cast with the sectors.

The present disclosure is related to a device 100 configured for aligning a first hole 131 of a first flange 130 with a second hole 141 of a second flange 140. The device 100 comprises a base 101, a shaft 110 extending from the base 101 and a first and a second pusher 115, 116. The shaft 110 is configured to move between a retracted position and an extended position. The shaft 110 in the extended position extends from the first hole 131 into the second hole 141. The first and second pushers 115, 116 are also configured to be moved radially outwardly from the shaft 110 to exert pressure against an inner wall of the first and second holes 131, 141. Methods for aligning a first and a second hole 130, 140 are also provided.

A connector (200) for securing an inner tubular (105) to an outer tubular (107) includes an inner gripper (220), and outer gripper (210); and a wedge (230). The connector (200) is configured to be located in an annulus between the inner tubular (105) and the outer tubular (107), and to be moveable from a collapsed configuration where the inner tubular (220) can move relative to the outer tubular (210), to an expanded configuration; the inner tubular (105) is secured by the connector (200) to the outer tubular (107). The wedge (230) is configured to be driven between and moveable relative to outer and inner surfaces of the outer gripper (210) such that, in use, movement of the wedge (230) causes movement of an inner surface of the inner gripper (220) radially inwards towards the inner tubular (105) and/or movement of the outer surface of the outer gripper (210) radially outwards towards the outer tubular (107), thereby moving the connector (200) from the collapsed configuration towards the expanded configuration. In the expanded configuration the inner surface of the inner gripper (220) is engaged with the inner tubular (105) and the outer surface of the outer gripper (210) is engaged with the outer tubular (107).

A method of assembling a wind turbine tower section (12a) from a plurality of tower segments (22) includes providing the plurality of tower segments (22) to a wind turbine installation site (32), forming a tower section frame assembly (96) by connecting at least two tower segments (22a, 22b) with a support beam (72), wherein the tower section frame assembly (96) forms a framework on which to further assemble the tower section (12a), arranging the tower section frame assembly (96) on an assembly stand (42), and attaching the remaining plurality of tower segments (22c-22h) to the tower section frame assembly (96) to form the tower section (12a). A method of preinstalling splice plates (106) on the tower segments (22a-22h) for guiding or assembly simplification purposes is also disclosed. The splice plates (106) may be preinstalled from the factory or at the installation site (32).

A tubular section includes a plurality of prefabricated concrete formworks (11) in a closed connection to form a regular polygonal structure, each prefabricated concrete formwork (11) includes two prefabricated wall panels (111) spaced apart from each other and a connecting piece (113) connecting the two prefabricated wall panels (111), an accommodation cavity (112) is defined between the two prefabricated wall panels (111), the accommodation cavities (112) of the plurality of prefabricated concrete formworks (11) are in communication with each other, all the accommodation cavities (112) are filled with concrete (16), and the concrete (16) in all the accommodation cavities (112) is solidified to be integral as a whole.

A hybrid wind turbine tower (12) includes at least one polygonal tower section (24) with a polygonal cross-sectional profile connected to a foundation (28), at least one tubular tower section (26) with a circular cross-sectional profile for connection to the nacelle (14), and a transition piece (40) disposed between the at least one polygonal tower section (24) and the at least one tubular tower section (26). The transition piece (40) includes an upper portion having a circular cross-sectional profile connected to a lower end of the at least one tubular tower section (26), and a lower portion having a polygonal cross-sectional profile connected to an upper end of the at least one polygonal tower section (24). A method for assembling a hybrid wind turbine tower (12) is also disclosed.