The application relates to a floatable foundation structure for an offshore structure including at least one floating body arrangement and at least one mass arrangement. The mass arrangement is connected to the floating body arrangement by at least one holding rope in a coupling state. Further, in the coupling state for coupling the floating body arrangement to the mass arrangement, a coupling section of the holding rope is arcuately guided around a contact section of the mass arrangement.
An offshore structure (1) with tubular braces (110) that are joined by joints (125) at nodes (120). The tubular braces (110) may be made of steel. The joint (125) is formed by means of casted concrete or grout in a receiving joint volume (150) in one or both of the braces (110). Also disclosed is a a keel structure formed by braces (110) and joints (125) as outlined and a combination of a wind turbine and such offshore structure (1).
B63B 3/04 - Hulls assembled from prefabricated sub-units with permanently-connected sub-units
B63B 75/00 - Building or assembling floating offshore structures, e.g. semi-submersible platforms, SPAR platforms or wind turbine platforms
E02B 17/00 - Artificial islands mounted on piles or like supports, e.g. platforms on raisable legsConstruction methods therefor
E02B 17/02 - Artificial islands mounted on piles or like supports, e.g. platforms on raisable legsConstruction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
An offshore floating structure (100) comprises a floater (200) with positive buoyancy and a keel (300) with negative buoyancy, as well as active and passive suspenders (400) connecting nodes of the keel (300) and the floater (200) with each other. When the keel (300) at the offshore site is lowered by making the active suspenders (440) longer, the passive suspenders (420), which have a fixed length and are held taut, causes the keel (300) to rotate about the vertical during lowering.
B63B 35/44 - Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
B63B 1/10 - Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
B63B 77/10 - Transporting or installing offshore structures on site using buoyancy forces, e.g. using semi-submersible barges, ballasting the structure or transporting of oil-and-gas platforms specially adapted for electric power plants, e.g. wind turbines or tidal turbine generators
F03D 13/25 - Arrangements for mounting or supporting wind motorsMasts or towers for wind motors specially adapted for offshore installation
4.
BUOYANT FOUNDATION STRUCTURE FOR AN OFFSHORE CONSTRUCTION
The invention relates to a buoyant foundation structure (100, 200, 300, 400, 500, 600, 700) for an offshore construction (102), comprising at least one floating-body arrangement (104, 204, 704) and at least one mass arrangement (106, 206, 306, 406, 506, 606). The mass arrangement (106, 206, 306, 406, 506, 606) can be coupled, in a coupling state, to the floating-body arrangement (104, 204, 704) by means of at least one retaining cable (108, 208, 308, 408, 508, 608, 708). In the coupling state, a coupling portion (112, 212, 312, 412, 512, 612) of the retaining cable (108, 208, 308, 408, 508, 608, 708) can be guided in an arcuate shape around a contact portion (110, 210, 310, 410, 510, 610) of the mass arrangement (106, 206, 306, 406, 506, 606) in order to couple the floating-body arrangement (104, 204, 704) to the mass arrangement (106, 206, 306, 406, 506, 606).
A structural joint for offshore frame constructions comprising structural members (1, 2) is disclosed. The structural joint between the structural members (1, 2) comprises a fork part (3), an ear part (4), and a pin (5). The fork part and said ear part comprise a bore, which bore is arranged for receiving said pin. A method for the assembly of offshore frame constructions comprising structural members (1, 2), and use of the structural joint in an offshore wind turbine foundation for the connection between the columns and braces of the structure is also disclosed.
A protection system for a threaded fastener is described. Said system comprises a threaded fastener (1), a sleeve (11) and either two end caps (13), or one end cap (13) and one threaded hole (18) in a component (19). In order to avoid exposure to severely corrosive environments the sleeve (11) and either the two end caps (13), or the one end cap (13) and the one threaded hole (18), together form an enclosure around the threaded fastener (1). Said enclosure forms a cavity (17) which is completely sealed from the environment. Furthermore methods are described for mounting, inspection and maintenance of such protection system.
A floating wind turbine comprising a hull (1), a wind turbine (2) mounted on top of the hull (1) and a counterweight (3) suspended below the hull (1) by means of counterweight suspension means (18) is described. Also a method for the installation is described. The counterweight (3) comprises one or more counterweight buoyancy tanks (17). When the internal volume of the buoyancy tanks (17) is filled with air, the total buoyancy of the counterweight (3) is close to or greater than its weight. Hereby it is capable of floating in a towing / maintenance position with moderate or no support in the vertical direction from the hull (1) or other vessels. During towing, the hull substantially has the character of a barge, substantially relying on a large waterplane area and shallow draft to maintain stability. When the buoyancy tanks (17) are partly or completely flooded with water, the counterweight (3) will sink to an installed position at a level determined by the counter- weight suspension means (18). In this position the counterweight acts as a keel, stabilizing the foundation. The counterweight suspension means (18) are separately or jointly capable of transfer- ring both forces and moments to the hull (1), thereby enabling the counterweight (3) to stabilize the hull (1) when the counterweight (3) is in its installed position.
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