| 摘要 |
PROBLEM TO BE SOLVED: To provide a soft landing bottom-type ocean rig capable of constructing an artificial ground or the like even on the soft ground, preventing the change of a height of the artificial ground or the like caused by the change of a tide level, easily adjusting the ground landing force to the change of the loading and the tide level, and not directly conducting the change to the ground. SOLUTION: Soft landing bottom buoyancy bodies 3 are projected on a lower face of an upper deck 2 of the artificial ground 1, caisson-type closed structures 5 respectively having a bottom large to some degree are mounted on a submarine foundation ground 6, the buoyancy bodies 3 are inserted into the closed structures 5, the inland water 7 is packed in the closed structures 5, the buoyancy bodies 3 are soft landed on inner bottom faces of the closed structures 5, and the submarine foundation ground landing force is reduced, and the change of the height of the artificial ground or the like caused by the change of the tide level can be prevented by using the closed structures 5 of the large bottom area.
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