CONSTRUCTION METHOD FOR FIXING OFFSHORE MARINE PLATFORM TO A SEABED HAVING LAYERS OF A SOIL/CLAY NATURE

摘要

A construction method for fixing a foundation of an offshore platform to a seabed is disclosed. The platform is adapted to support wind turbines, bridges and marine buildings thereon. The platform includes at least one floater which has a bottom slab embodied as a downward pointing bottom cone-shaped object. In the method, a concrete bed is cast in the seabed, and the at least one floater is impressed into the concrete bed to form a mirror image, reversed cone indentation of the conic object in the concrete bed. The bottom cone of the at least one floater is aligned to the reversed cone indentation, and the platform is thereafter to couple the bottom cone and the reversed cone indentation together so as to fix the floater to the seabed. By applying the method to a seabed having a thick soft soil/clay layer, a steel tube having a diameter larger than that of the floater is employed, whereby the steel tube is driven into the seabed to the founding level. The steel tube functions as a temporary support or permanent support for the platform in four different ways.