| 摘要 |
A method of constructing an off-shore platform to be placed on the bottom of a body of water, maintained afloat during assemblage by floats supporting the structure composed of elements carrying a bridge on which working equipments are to be installed, comprises first anchoring the floats at a slight depth and connecting them by cross-pieces carrying vertical support columns. The upper element of the platform is then brought above the cross-pieces and made to rest on the support columns. The element is then raised to allow the passage of the immediately lower element, which is brought to rest on the support columns. The upper element is rested on the lower element. The elements composing the structure are placed in the order of their position in decreasing height, the last of the elements carrying the preceding elements put in place. The elements are lifted each time to allow the following element to pass underneath and to be placed on the support columns. The elements are joined together as they are laid down. Finally, the last element is connected mechanically to the support columns. Barges of relatively small capacity can be used because of the redn. of the elements to be handled. The time of assemblage is reduced by the use of prefabricated parts, which do not necessitate the use of a dock. The process allows of passing progressively from a temporary assemblage with attachments constituting only incomplete fittings to the rigid finished assemblage. |
