| 摘要 |
PURPOSE:To minimize the effects of ice on a structure by a method in which a column is thrust through a rotary structure, a bow portion having a curved face for breaking ice plate is provided to the large-sized portion, and a hull having a stern portion is provided to the contracted portion. CONSTITUTION:A cylindrical column 3 is erected on a mat 2 fixed to the seabed 1, an oil-well drilling deck 4 is fixed to the upside of the column 3, and the column 3 is thrust through a rotary structure 8 consisting of the opening of a hull 6. In the gull 6 as an ice plate breaker, the bow portion 6A having a curved face 6C for breaking the ice plate is formed in the large-sized portion, and the stern portion 6B is formed in the contracted portion. When a thruster 10 is driven and the bow portion 6A is turned toward the direction of flow- ing ice, as shown by arrow, the bow portion 6A is pressed by the ice plate 7, and the ice plate 7 is pushed down and broken to form the open-water face 13. Since the hull 6 is turned around the column 3 thereby, the attitude of the hull 6 can be changed such that the force of flowing ice is minimized toward the moving direction of the flowing ice. |
