Construction of a 3-span 190m-long viaduct, spanning the Brivet valley and the Savenay-Redon electrified railway line, in order to remove crossing No. 378. This level crossing, located in the Pontchâteau town centre, is the last one in the Pays de la Loire region. 

The entire operation to remove crossing No. 378 includes the creation of an East-West road with a viaduct over the railway line and the Brivet river.

 

This project includes:

 

- Design studies carried out by our internal design office and the self-production construction of a 90m-long access pier, without support from the Brivet river bed, supporting a 250-tonne crane on its central span

- Construction of a reinforced concrete pier on deep foundations in a sheet pile cofferdam installed by pile driving with our self production teams

- Construction of a reinforced concrete shallow-based pier with railway embankment shielding

- Design studies carried out by our in-house design office on the temporary support bases of the metal columns

- Construction of reinforced concrete abutments with stone facing and VSoL (retained earth wall system) return wall 

- Launch of the variable inertia double girder structural steelwork

- Construction of reinforced concrete slabs by travelling formwork

- Installation of precast slabs above the SNCF railway tracks

- Installation of bridge deck equipment including curved PMMA acoustic shields.