| 摘要 |
A trussed leg structure for use in jack-up mobile offshore platforms of the type that include a plurality of support legs extending into the water down to the ocean floor with jacking units engaging each leg to raise and lower the platform structure relative to the surface of the water. The leg structure disclosed includes a plurality of mutually parallel and laterally spaced apart column members rigidly interconnected to define a triangularly-shaped leg. The leg structure has only a single elongated rack carried on one of the column members to provide single point jacking of the leg. The rack comprises a flat, plate-like rack member having a set of rack teeth extending along each edge for meshed engagement with a separate one of a pair of pinions on a jacking unit. Two of the three column members are made of tubular pipe. The third column member, which carries the elongated rack, is an elongate rack plate oriented perpendicular to a plane defined by the first and second column members. The rack plate in combination with the rack member gives the third column member a generally T-shaped configuration. Cross-bracing extends between adjacent column members and includes horizontal brace members with diagonal brace members extending between adjacent pairs of horizontal brace members.
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