| 摘要 |
An offshore system of the articulated tower type is provided, which utilizes chain devices extending in different directions from the upper portion of the tower to the seabed to help maintain the tower in a largely vertical orientation. In one system wherein the tower must be held close to the vertical orientation, as where the system is used for drilling underwater hydrocarbon wells, an inclinometer is utilized to measure small angles of tilting of the tower, to operate one or more winches that pull on the chain devices. The chain devices can be in the form of heavy chains extending in loose curves. In another system, the chain devices are lines of highly stretchable material such as nylon, and which may be nearly neutrally buoyant, and with the lines extending in almost straight lines between the tower and seabed.
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