Off-shore mooring structure

A structure for mooring ships offshore and loading them comprising an emerging portion equipped with mooring and loading facilities and an immersed portion, characterized in that said immersed portion is monolithic and is composed of a broadened rigid foundation block and a slender vertical structure having a flexural resistance modulus decreasing from the foundation block towards the sea surface, said vertical structure having a hollow buoyancy body located on the upper end of said slender vertical structure at a depth between 12% and the 30% of the length of said slender vertical structure between the sea surface and the foundation block, said structure further characterized in that the flexural moment of inertia of the slender vertical structure is increased in the portion between the buoyancy chamber and the point of connection with the foundation block according to the formula:

• ##EQU2## wherein reference being had to FIG. 3 of the accompanying drawings, J is the flexural moment of inertia of a cross-section situated at a distance x from the buoyancy chamber, J.sub.o is the moment of inertia of the cross-section of connection with the buoyancy chamber, L is the length of the portion between the buoyancy chamber and the point of connection with the foundation block, K.sub.2 is a coefficient (adimensional) comprised between 1.6 and 2.5.