| 摘要 |
A platform for drilling or production operations at sea, consisting of a working platform 3 above sea-level, carried by a column 4 which is buoyant, containing tanks 5 and 6 for ballasting, and equipped with a jointed coupling 7 capable of swinging movement in two relatively transverse planes, connecting this first column to the upper end 9 of a second column 12, the other end of which, possibly equipped with another jointed coupling 13 with two degrees of play, is attached to a base 15 with high non-buoyancy, designed to rest on the sea-bed.
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