| 摘要 |
PURPOSE:To avoid the application of tortional force to panel structures by speicifically moving a floating crane hanging a panel as the panel is erected when erecting large-size trapezoidal panels constituting the jacket of an oil drilling rig, etc. CONSTITUTION:Under a condition that the barge B of a crane 1 is positioned on the extended line of one inclined side A on the erecting side of a panel A, one inclined side A' is hung up and moved along the circular line of the crane 1 at the crossing point (as center) between one inclined side A' and other inclined side A'' on the grounded side while regulatively moving the crane 1 in such a way that targets 4 and 5 provided to the panel A are in line with targets 2 and 3 provided to the crane 1 on the same level. The barge B and the crane 1 are displaced to an imaginary place and the erection of the panel A is completed. |
