The invention relates to a method for the installation of a marine (or in general, aquatic) wind-powered generator tower, wherein said tower advantageously comprises a foundation that is open at the top and equipped with a substantially flat lower slab and a perimeter wall. The method includes, in the different stages thereof, the depositing or removal of ballast material in or from the main cavity of the foundation, and wherein in the absence of said ballast material, the wind-powered generator or the foundation is a floating or self-floating structure. The method is particularly suitable for the installation of wind-powered generators in areas of low depth (or near-shore areas), preferably of less than 15 m.

A subsection of a tower section comprises a shell segment of the tower section and at least a longitudinal flange mounted to a longitudinal side of the shell segment for connecting to a longitudinal flange of a further subsection of the tower section. Here, the longitudinal flange comprises a part of a surface contour extending from a contact surface of the longitudinal flange which is provided for a connection to a longitudinal flange of a further subsection to a connecting surface connected to the shell segment. The part of the surface contour comprises a distance to a contacting plane passing through the contact surface.

Provided is a coupling assembly of a wind turbine including a first coupling part and a second coupling part, the first coupling part and the second coupling part being configured to be coupled with each other, the first coupling part including a first surface with a first insertion hole being configured to be inserted by a fastener, the second coupling part including a second surface with a second insertion hole being configured to be inserted by the fastener, the first surface being configured to abut the second surface.

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 a coupling assembly of a wind turbine including a first coupling part and a second coupling part, the first coupling part and the second coupling part being configured to be coupled with each other, the first coupling part including a first surface with a first insertion hole being configured to be inserted by a fastener, the second coupling part including a second surface with a second insertion hole being configured to be inserted by the fastener, the first surface being configured to abut the second surface.

A streamlined body, apparatus for suppressing vibrations of an enclosure, and a method for hoisting a tower are provided. The streamlined body surrounds the enclosure, and the streamlined body has a streamlined leading edge. The leading edge can faces towards the upwind incoming flow, to allow the upwind incoming flow to form a positive attack angle or a negative attack angle. In this solution, the enclosure is surrounded by the streamlined body, and when the upwind incoming flow flows around the enclosure to come into contact with the streamlined body, the aerodynamic configuration is changed, and the aerodynamic coefficient becomes small, thus the vibrations are reduced. Moreover, the direction and path of the airflow are changed, which disrupts the correlation of the upwind incoming flow near the streamlined body, and disrupts the consistence of frequencies of vortex shedding of the airflow at the streamlined body and other positions.

A tower structure of a wind turbine includes a plurality of tower sections stacked atop each other in an end-to-end configuration along a vertical axis to form the tower structure of the wind turbine at a wind turbine site. Each of the tower sections is formed of at least one first tubular portion and at least one second tubular portion. Further, the first and second tubular portions of each of the plurality of tower sections are concentric with each other. Moreover, the first tubular portion is formed at least in part, of a cementitious material and the second tubular portion is formed of a perforated material having a plurality of holes.

A transition piece for a wind turbine tower including a hollow frustoconical piece that is connected to an upper ring and a lower ring. The upper ring is connected to crossbars and the lower ring to radial columns. The transition piece also includes three connectors, each of them being connected to a crossbar, two radial columns and two connection profiles that keep the three connectors joined together, so that a pair of radial columns is arranged between a connector and the lower ring and the crossbars are arranged between the upper ring and a respective connector. The radial columns form an angle of between 65° and 75°, measured between the longitudinal axis of the corresponding radial column with the normal axis of the frustoconical piece.

Offshore structure comprising a pile of a foundation and at least one offshore element, mounted on the pile, forming a slip joint, wherein between an inner surface of the offshore element and an outer surface of the pile: —a coating, especially an anti-fouling coating is provided, increasing friction between the said two surfaces and/or preventing corrosion of one or both of said surfaces and/or —at least two spaced apart areas are provided with a substance, forming a seal between the said outer surface and the said inner surface, near an upper end of the pile and the off shore element and between a lower end of the off shore element and the pile.

Methods 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.