Abstract: A structure for the transport, installation and dismantlement of a deck (2) of a fixed oil platform (1) for maritime use, the structure including a floating U-shaped hull (11) fitted with at least three lifting legs (12) adapted so as to rest upon the bottom of the sea, each lifting leg (12) being associated with mechanical displacement units (20), and a shuttle (30) which can be displaced along the lifting legs (12) by the hull (11) and which is applied to the lower surface of the deck (2) in a support position for the deck, the shuttle (30) being provided with locks (36, 37) for locking on the lifting legs (12). A method for the transport, installation and dismantlement of a deck of a fixed oil platform is also disclosed.

Abstract: The invention relates to a structure for the transport, installation and dismantlement of a bridge (2) of a fixed oil platform (1) for maritime use, characterized in that it comprises a floating U-shaped shell (11) fitted with at least three shell (11) lifting legs (12) adapted so as to rest upon the bottom of the sea, each lifting leg (12) being associated with mechanical displacement means (20), and a shuttle (30) which can be displaced along the lifting legs (12) by the shell (11) and which is applied to the lower surface of the bridge (2) in a support position for said bridge, said shuttle (30) being provided with means (36, 37) for locking on the lifting legs (12). The invention also relates to a method for the transport, installation and dismantlement of a bridge of a fixed oil platform.