The invention relates to a structure (2) for supporting a wind turbine tower (1) provided with a housing (7) for fitting therein the foot of the tower (1), a main axis (Γ) being defined on the platform (2) which coincides with a main axis of the tower (1), and which comprises a body with a constant cross-section and internal walls (8) and intermediate walls (10) joined by internal radial ribs (11) perpendicular to the internal wall (8) whose plane passes through the main axis (Γ), such that at the intermediate wall (10) first joining nodes (12) are defined between the intermediate wall (10) and radial ribs (11), the intermediate wall (10) and an external wall (9) being joined by reticular ribs (14 and 15). This structure provides an optimal transmission of forces. The invention likewise relates to methods for manufacturing, assembling and installing the structure.

Described and disclosed is a foundation structure of an offshore structure, in particular of a wind turbine, with a floating foundation, including at least one floating body for floating on the surface of the sea, at least one anchor for anchoring the at least one floating body the seafloor and at least one holding element for holding the at least one floating body to the at least one anchor. At least one transmission cable extends from the at least one anchor along the at least one holding element to the at least one floating body and/or back. To enable a reliable monitoring of the anchoring of the offshore structure, provision is made for the transmission cable to be guided in sections through at least one protection element provided between the holding element and the at least one anchor and/or the at least one floating body.

A lift system and method for supporting a structure. The lift system includes a first buoyant sponson tank comprising a sponson tank that extends from a first end to a second end, a mechanical assembly extending from the second end of the sponson tank, the mechanical assembly to transfer a load of a structure disposed on the mechanical assembly to the sponson tank. The sponson tank is configured to be displaced by a volume of fluid that is external to the tank and the tank provides a predetermined buoyant force against the structure to cause the structure to be displaced vertically.

A water-buoyant structure formed from concrete is disclosed. The structure comprises an outer wall that surrounds a perimeter of the structure and an inner wall separated from the outer wall by a cavity, such that the cavity extends for the perimeter of the structure. Separating the cavity can provide sufficient buoyancy to the structure to allow 5 the structure to float. The combination of outer and inner walls may also provide increased resistance to catastrophic damage in the event of an impact (e.g. the inner wall may remain intact).

A water-buoyant structure formed from concrete is disclosed. The structure comprises an outer wall that surrounds a perimeter of the structure and an inner wall separated from the outer wall by a cavity, such that the cavity extends for the perimeter of the structure. Separating the cavity can provide sufficient buoyancy to the structure to allow 5 the structure to float. The combination of outer and inner walls may also provide increased resistance to catastrophic damage in the event of an impact (e.g. the inner wall may remain intact).

A lift system and method for supporting a structure. The lift system includes a first buoyant sponson tank comprising a sponson tank that extends from a first end to a second end, a mechanical assembly extending from the second end of the sponson tank, the mechanical assembly to transfer a load of a structure disposed on the mechanical assembly to the sponson tank. The sponson tank is configured to be displaced by a volume of fluid that is external to the tank and the tank provides a predetermined buoyant force against the structure to cause the structure to be displaced vertically.

A lift system and method for supporting a structure. The lift system includes a first buoyant sponson tank comprising a sponson tank that extends from a first end to a second end, a mechanical assembly extending from the second end of the sponson tank, the mechanical assembly to transfer a load of a structure disposed on the mechanical assembly to the sponson tank. The sponson tank is configured to be displaced by a volume of fluid that is external to the tank and the tank provides a predetermined buoyant force against the structure to cause the structure to be displaced vertically.

Arch structure of steel frame construction comprising: a plurality of elongated metal or steel stringer members and arch members, each stringer member and arch member comprising one of a tubular, I-beam, I-beam angled flange, C-beam, T-beam, and L-beam, cross-section shape, each of the plurality of arch members undergirding a one of the plurality of stringer members located between two non-adjacently positioned stringer members at a mid-point of each of the plurality of arch members, each of the plurality of arch members being oriented in crossing relationship to another of the arch members, the arch members being oriented for indirect complete abutting, and without any notch in any the arch member or any the stringer member, side surfaces of the plurality of stringer members via a plurality of brackets and fasteners. Or, the arch member ends may completely abut and be welded to side surfaces of the stringer members.

The invention relates to a maritime structure for laying the foundations of buildings, installations or wind turbines by means of gravity in a marine environment, which has significant advantages for constructing, transporting, positioning and operating same, owing to the novel features introduced into the design thereof in comparison with existing types. The structure comprises a base in the shape of a chamfered equilateral triangle, having a sufficient height to optimise navigability, the base being formed by a frame of vertical walls that form hexagonal or triangular cells closed at the ends by a lower slab and an upper slab, and three closed towers having a regular hexagonal or circular cross section which are located in the corners of the base. The structure can be towed, completely installed, with a wind turbine or superstructure that same supports, and has low initial draft, high naval stability and low resistance to movement. The lowering process is performed by using gravity to ballast the cells with seawater, without needing any additional means, auxiliary large-capacity vessels or floating elements external to the structure itself. The structure can be positioned as a gravity foundation at a depth of 20 to 50 meters and can be re-floated to be transferred whole again to a port for dismantling.

A building development (1), having a building (4) arranged on a building development base (2), wherein the building development base (2) has a pontoon (8) having at least one float (6) for floating on a liquid and a pile mooring (10), which extends through a passthrough opening (14) of the pontoon (8) along a pile mooring axis (X) perpendicularly to the pontoon (8). The passthrough opening (14) is configured centrally in the pontoon (8), and the pontoon (8) is rotationally movably mounted around the pile mooring (10) that extends through the passthrough opening (14). The pontoon (8) can be aligned and positioned around a pile mooring axis (X), wherein the pile mooring (10) projects into the receiving chamber through the passthrough opening (14) of the pontoon (8) and through a first breakthrough (16) arranged in a bottom of a receiving chamber, arranged above the passthrough opening (14). The invention relates further to a building development base (2) and a pile mooring (10) of such a building development (1).