Once the demolition of the old deck has been completed and the pier caps have been adapted, the new decks will be launched. They will be built using mixed steel-concrete technology, with a box cross-section; the slab and bottom flange will be made of concrete and the webs of steel. The deck will be constructed by assembling segments between 7.00 m (pier head segments) and 3.5 m (stitch segments) in height. The viaduct will always have 5 spans each way, using the existing piers.

For the existing piers, a hydrodemolition of the external wall is planned, as well as the installation of new rebars and a new mortar overlay casting to upgrade the durability of the surfaces. A cut is planned at the top of the existing piers, on top of which part of the existing vertical reinforcement will be salvaged and the planned pier caps will be built. The existing foundations, consisting of plinths on shafts, will remain unchanged.

The Parma side abutment will undergo extraordinary maintenance while the La Spezia side abutment will be newly built in a position behind the existing one.

During the investigation activities on the design of the interventions, an instrumental geotechnical monitoring system was set up near the La Spezia side abutment in the area affected by landslip, called F61 – “San Rocco”.

In the design of the new viaduct and the abutment on the La Spezia side (the geometric drawings of which are shown below), consideration was made of the structure’s ability to accommodate and recover over time the movements of the abutment itself, now estimated over a period of 20 years. Therefore, periodic repositioning of the supports is planned.

The continuous measurements of the geotechnical and structural monitoring system will be used by the Concessionaire over the coming years in order to plan the timely realignment of the bridge bearing over the above time period and to better define any possible mitigation interventions.