To greatly reduce drag in a tidal current and waves or the like by sliding a cover 1 on a cylindrical pillar member 2 in case of receiving the tidal current or waves from a direction of an arrow (1) which is parallel with a major axis of the cover 1, sliding the cover 1 in a reverse direction of the direction mentioned above in a case of receiving the tidal current or waves from a reverse direction of the arrow (1), and rotating the cover 1 around the cylindrical pillar member 2 to a state indicated with chain line in case that a direction of flow changes from the direction indicated by the arrow (1) to an arrow (2).
The cover 1 of ellipse or a shape similar to the same is slidably, or rotatably or slidably and rotatably arranged on the cylindrical pillar member 2 of an offshore structure.
OTANI RYOICHI
TAKAMI TAKESHI
OYO CORP
JPS5495499A | 1979-07-27 | |||
JPS56120842A | 1981-09-22 | |||
JPS5613278A | 1981-02-09 | |||
JPS62129486U | 1987-08-15 | |||
JPS5850291A | 1983-03-24 | |||
JPS56105092A | 1981-08-21 | |||
JPS62129486U | 1987-08-15 | |||
JPS5850291A | 1983-03-24 | |||
JPS56105092A | 1981-08-21 | |||
JPS5495499A | 1979-07-27 | |||
JPS56120842A | 1981-09-22 | |||
JPS5613278A | 1981-02-09 |
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