| 摘要 |
PURPOSE:To make a jacket structure in a framework consisting of plural legs and braces stowable on a ship in a state of standing erect without deforming the jacket structure due to a wire touch on these braces, in case of drilling rigs and installations for oil field development. CONSTITUTION:In the case where a jacket structure 1 consisting of plural pieces of legs 2 and also plural braces 3 connecting each interval between these legs 2 is loaded on a ship, first of all, a wire 4 out of a jig 6a of a floating crane 6 is attached to a specified spot inclusive of a ground contact part of a tip in the structure 1 being laid down, and a sling beam 5 installed in the midway of the wire 4 is made contact with the top of a lever 2 in a corner part of the tip of the structure 1. Then, the structure 1 is hoisted by the crane 6, making the structure 1 stand upright. At this time, the load imposed on the wire 4 is turned to the axial direction of each leg 2 via the sling beam 5, thus avoiding the deformation of each brace 3. Afterward, the structure 1 is shipped in a state of being left upright intact by means of the crane 6. |
