Abstract: A tower structure having a central column, three support legs and a base structure which can be anchored to the sea bed by means of piles. The legs and base structure are constructed as an integral preformed base unit with a sleeve attached to the upper ends of the legs.The column is slidingly engaged within the sleeve of the base unit. A rigid connection is made between the column and the sleeve. In the erected structure, the primary load of the column is transmitted through the column and sleeve connection via the base unit to the sea bed.

Abstract: An offshore tower structure comprising a base structure for positioning on and fixing to the sea bed, a central column for containing services such as conductors and risers and extending, in use, from the base structure to above the water level for supporting a platform, at least three support legs each extending between an upper portion of the column and the base structure at points spaced from the column for providing support for the column, and a bracing structure comprising a framework lying intermediate the ends of the column in a plane perpendicular to the longitudinal axis of the column, the framework connecting each pair of adjacent legs and each leg directly or indirectly with the column, and bracing elements between the column and the legs or between adjacent legs extending from the plane of the framework to respective points at or adjacent the base of the structure.