Mobile Ocean Basing Systems: The Concrete Semi-Submersible Platform.
Final rept. Nov 70-Dec 72,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A study was made to investigate the feasibility of substituting concrete for steel as the primary construction material in a self-propelled semi-submersible platform. Of the configurations considered, eleven were determined to meet all of the study design criteria. It is concluded that the concept is feasible provided that a deck not exceeding 375 lbs per square foot dead weight is used, an underneath deck clearance of 30 to 40 feet above the mean water surface is acceptable, and columns and hulls up to 60 feet in outside diameter having a wall thickness not exceeding 2 feet are acceptable from considerations of formability and strength. The construction, assembly, launch and testing of a 110 scale model twin hull semi-submersible platform is also described. The model was constructed to verify the findings of the self-propelled platform feasibility study, to demonstrate the feasibility of assembling available concrete products into a platform, to evaluate construction techniques and to study means of linking platform modules together to form large platforms. Author
- Marine Engineering