| 摘要 |
<p>The deck or superstructure (48) for an offshore production platform is shifted from a loading facility (72) onto a cargo vessel (10) that includes a large-area lifting assembly (12A, 12B, 12C). The vessel (10) transports the superstructure (48) to a previously installed substructure (84, 86). On site, the elevator assembly (12A, 12B, 12C) raises the superstructure (48) above the top of the substructure jacket, aligns the superstructure (48) with the substructure (84, 86) and then mates the two together by lowering the elevator assembly (12A, 12B, 12C). The elevator assembly (12A, 12B, 12C) is designed to break away very rapidly from the substructure (84, 86) to compensate for vessel (10) rebound when the mass of the superstructure (48) is accepted by the substructure (84, 86).</p> |
