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.
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