Importance

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Abstract

In case of constructing a gravity-type marine structure at a spot with a comparatively great depth of water, a footing 2 serving as a float is constructed in a dry dock, and a cylindrical body 4 constituting an underwater substructure is constructed on the footing 2 in a shallow sea yard. The cylindrical body 4 is telescopically assembled and an upper cylinder 4C is made to function as a float. Ballast water W.sub.b is filled in the footing 2 at the installing spot with a great depth of water to submerge the footing 2, and a lower cylinder is extended with the upper cylinder 4C as a float. After the footing 2 has landed, the footing 2 and the cylindrical body 4 are charged with a filler, and an upper structure on the sea is constructed on the upper part of the cylindrical body 4. Since the cylindrical underwater substructure is constructed in the telescopic form on the footing serving as the float, a structure adapted for a sea area with a great depth of water is constructed while the stability as the float is easily kept, even in an area incapable of ensuring a quiet coastal area with a great depth of water. In the installing spot with a great depth of water, the buoyancy and gravity are utilized to easily extend the structural body without any large-scale driving apparatus, and a huge structure is easily installed in a submerged state.

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First Claim