this contract concerns lot 1 of the rehabilitation of the Colbert Bridge. In the basic offer, the interruption of traffic must not exceed 18 months, the relocation of the bridge is possible and the installation of a removable pedestrian bridge is not mandatory. It is a work of art classified as a Historical Monument in puddled and rolled iron, built in 1889. Dimensions of the book Lx H x W = 8.60 m x 7.113 m x 70.5 m (of which 47 m long for the volley and 23.5 m for the breech). The current estimated weight of 476 t. The operation of the hydraulic machinery is carried out thanks to a closed circuit with fresh water in iso-pressure at 50 bar thanks to a counterweight mounted on a piston. The rotation of the bridge is carried out by 2 jacks in opposite movement, connected by a chain to the crown of the bridge. The lifting of the bridge is ensured by presses. The manual opening of the bridge allows ships access to the inner port. This bridge is an essential operating tool for the operation of the port and the city

this contract concerns lot 1 of the rehabilitation of the Colbert Bridge.

It is a work of art classified as a Historical Monument in puddled and rolled iron, built in 1889. Dimensions of the book Lx H x W = 8.60 m x 7.113 m x 70.5 m (of which 47 m long for the volley and 23.5 m for the breech). The current estimated weight of 476 t. The operation of the hydraulic machinery is carried out thanks to a closed circuit with fresh water in iso-pressure at 50 bar thanks to a counterweight mounted on a piston. The rotation of the bridge is carried out by 2 jacks in opposite movement, connected by a chain to the crown of the bridge. The lifting of the bridge is ensured by presses. The manual opening of the bridge allows ships access to the inner port. This bridge is an essential operating tool for the operation of the port and the city.

The rehabilitation of the structure consists of a restoration of the structural and functional elements, and various modernization operations.

In view of the situation, the smallest possible inconvenience to the functionalities of the city (vehicle and pedestrian transit) will be sought. Thus, in the basic offer, the interruption of traffic must not exceed 18 months, the relocation of the bridge is possible and the installation of a removable pedestrian bridge is not mandatory.

In variants, shorter deadlines (9, 12 and 15 months) will be sought and solutions for passenger transit may be options.