A foundation according to the invention for offshore facilities, preferably at shallow depths, has a substantially bell-shaped bottom part (1) of steel plate with a central cavity (21) and peripheral pressure tight chambers (25) which are separated by bulk-heads (23). The foundation is brought down into seabed or lake bottom (10) consisting of sand. After placing on the bed, according to the invention there is created underpressure in the chambers (25) so that a water current occurs through the bed layer around lower rims (17, 19) of the bottom part. Thereby the bed material is fluidised under the rims (17, 19), and the foundation sinks down into the bed by its dead load. The fluidization may be varied along different parts of the rims (17, 19) by providing different pressures in different chambers (25) whereby the foundation may be righted during the bringing down and thereby compensate for uneven bed etc. By the invention, the use of heavy concrete caissons may be avoided, and allowance is made for environmental demands regarding removal of the foundations after use as the foundation according to the invention weighs considerably less and is easier to remove.

Method for establishing a foundation in a seabed for an offshore facility and the foundation according to the method

Offshore-Anlage (1), insbesondere Windkraftanlage, mit wenigstens drei Verankerungselementen (8) zum Verankern der Offshore-Anlage (1) an einem Meeresgrund (16), die in Form eines Hohlkorpers ausgebildet sind, der einen Innenraum (30) umschliest und zu einer Unterseite hin offen ausgebildet ist, wobei in der der Unterseite gegenuberliegenden Oberseite (18) des Hohlkorpers wenigstens eine Austrittsoffnung (20) vorgesehen ist, dadurch gekennzeichnet, dass die Offshore-Anlage (1) einen Turmaufbau (2) aufweist, der durch ein Untergestell (4) mit den wenigstens drei Verankerungselementen (8) verbunden ist, wobei der Turmaufbau (2) mit dem Untergestell (4) winkelverstellbar verbunden ist und zwischen dem Turmaufbau (2) und dem Untergestell (4) eine Verstellmoglichkeit vorgesehen ist, mit der eine Winkeljustierbarkeit des Turmaufbaus (2) gegenuber dem Untergestell (4) moglich ist.

Offshore-Anlage, insbesondere Windkraftanlage

A wind turbine (1) has a base (5) divided into at least three ballast tanks (12). The wind turbine base has at least three lifting points (23) with fittings for mounting fastening means and spaced apart in the horizontal direction. The stability of the wind turbine against capsizing is maintained by upward, horizontally separated lifting forces in horizontally distanced lines (10) fixed at the lifting points (23) during the entire lowering, and also while the upper surface of a lower section of the base (5) passes down below the sea surface.

A wind turbine with a wind turbine base, and methods of transferring or moving a wind turbine

A structure (1) for mounting offshore installations (2) such as wind turbines or oil and gas platforms. The structure (1) comprises: a base (4). a top piece (8), and a lattice (6) structure connecting the base (4) to the top piece (8). The sub-components of the structure (1) can be pre-assembled prior to installation to facilitate ease of construction, or they may be transported to a pre-determined location and assembled on site.

Structures for offshore installations

Jack up platform supported on suction piles

Foundation arrangement for an offshore framework construction or subsea installation for use in oil or gas operations and the like, in particular where the seabed consists of relatively solid sand or of clay, and the framework construction or subsea installation comprises a number of separate legs (8) being rigidly connected to each other and having each a separate foundation on the seabed. Each of at least three separate legs (8) is provided at its lower end with at least one downwardly open chamber (3) which in a manner known per se comprises side walls or skirts adapted to penetrate down (5) into the sand or clay seabed. The chamber or chambers (3) at each leg (8) has (have) an associated suction or pump means (7) which can be individually controlled for establishing a sufficient, relative underpressure in each chamber (3) to withstand a predetermined upward force acting through the leg (8) concerned.

Foundation arrangement for an offshore framework construction or subsea installation

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Foundation arrangement for an offshore framework construction or subsea installation