ABSTRACT:

The presence of soft superficial soils for an offshore platform installation could lead to unusually low bearing capacities. As a consequence, the traditional mud-mat bearing areas may not offer an appropriate and acceptable solution. A new effective approach, alternative to traditional "through the leg pile" and "skirt pile" jacket configurations, can be adopted in order to solve the technical problems due to very poor on-bottom stability of structure. The new jacket concept is suitable for the foundation on pre-installed piles (hereinafter called simply "pin pile jacket") installed utilising a guide frame and driven by an underwater hammer. The jacket is then upended, docked vertically over the pre-driven pin/foundation piles with final grouting of the leg/pile annulus. This paper outlines the development of a pin pile jacket system and describes the design, fabrication, installation and related economical aspects.

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