| 摘要 |
A rig which can be towed in floating condition comprises a hollow shaft connected with a base section and supporting a bridge equipped with various installations. In order to allow laying of the base section at a precise location on the seabed, the base section is provided with peripheral notches which can slide along vertical piers and is provided also with piles which are extended and locked when the notches are placed against the piers. Thereafter, the base section is allowed to sink to the bottom by sliding against the piers. Such a rig is useful for oil drilling purposes.
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