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.

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 anchoring 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 self-installing offshore platform includes a top deck that supports an offshore facility, a column having a top end and a bottom end, the top end connected to the top deck, the column that supports the top deck to maintain the top deck above water in a water body in both the deployed state and the undeployed state of the self-installing offshore platform, a skirt connected to the bottom end of the column, the skirt residing above a floor of the water body in the undeployed state of the self-installing offshore platform and residing on the floor of the water body in the deployed state of the self-installing offshore platform, and a ballastable float positioned between the top deck and the skirt, the ballastable float floating in the water when the self-installing offshore platform transitions from the undeployed state to the deployed state.

A self-installing offshore platform includes a top deck that supports an offshore facility, a column having a top end and a bottom end, the top end connected to the top deck, the column that supports the top deck to maintain the top deck above water in a water body in both the deployed state and the undeployed state of the self-installing offshore platform, a skirt connected to the bottom end of the column, the skirt residing above a floor of the water body in the undeployed state of the self-installing offshore platform and residing on the floor of the water body in the deployed state of the self-installing offshore platform, and a ballastable float positioned between the top deck and the skirt, the ballastable float floating in the water when the self-installing offshore platform transitions from the undeployed state to the deployed state.