The works concern the demolition/reconstruction of the PI 3004 structure, a structure carrying the motorway and under which the Chambéry urban expressway passes.

Design/construction contract for the replacement of the decks of the PI3004, a prestressed concrete structure of the "ribbed slab with prefabricated segments" type. The deconstruction and reconstruction work is to be carried out under strong operational and space constraints. The contractor is responsible for the design and execution of the works (deconstruction and associated methods, design and construction/assembly of the new decks, design and implementation of any adaptations of the supports and seismic compliance, installation of equipment and connection to the current section). The structure is composed of two spans and consists of two decks measuring 11m by 44m. The impact on the operation of the A41, A43 and VRU (lane crossing) will have to be minimised.