Supertanker Fixed Berth in Open Ocean

by Atsushi Seiki, Project Mgr.; Kajima Corp., Tokyo, Japan,
Yasumasha Shimada, Civil Engrg. Design Engr.; Kajima Corp., Kyoto, Japan,


Serial Information: Civil Engineering—ASCE, 1976, Vol. 46, Issue 4, Pg. 56-58


Document Type: Feature article

Abstract:

The oil terminal offshore Tomakomai, Japan, is the world's first fixed dock in open ocean. It must withstand 150 mph typhoon winds. To minimize time, cost and danger of open ocean work on steel jackets, the key is speedy driving of the piles that hold them in place. Jack-up rigs can safely operate more days a month than floating pile drivers. So here a jackup was used, but with a difference�� the job-built rig, 242 x 147 ft in plan, has a large open well in its center, under which the jacket is centered to speed pile driving. A large cellular cylindrical fender was developed that absorbs impact of berthing ships, reduces by 33% the force exerted by tankers up to 280,000 deadweight tons.

Subject Headings: Ocean engineering | Traffic speed | Steel piles | Pile driving | Wind engineering | Ship motion | Safety

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