State of the art and structural characteristics

With the demolition of the old north carriageway deck now complete and the adaptation of the piers finished, the new structure is currently being launched. The latter is made using mixed steel-concrete technology and has a box-shaped cross-section, with steel cores and concrete slabs (upper and lower). The deck is assembled in sections of varying heights, from 7.00 m (at the piers) to 3.5 m (suture section). The same work will be replicated on the south carriageway. Upon completion of the work, the viaduct will retain its original configuration of five spans for each lane, resting on the existing piers, which have been suitably upgraded.

Work on the substructures

The existing piers are undergoing extensive restoration work to improve their durability: after hydro-demolition of the external walls, new reinforcement bars are being installed and reinforced with special mortars. A technical cut has been made at the top of the piers on the north carriageway, preserving part of the original vertical reinforcement for the integration of the new sills. This procedure will also be followed for the south carriageway. The original foundations, consisting of plinths on shafts, will remain unchanged.
As regards the abutments:
•   Parma side: the extraordinary maintenance work was completed in 2024.
•   La Spezia side: the abutment was completely rebuilt in a position set back from the previous one, with work completed in 2025.

Monitoring and management of landslides

Given the presence of the landslide known as F61 – “San Rocco” near the La Spezia side shoulder, an instrumental geotechnical monitoring system was implemented during the design phase.
The new structural layout of the viaduct and the La Spezia side shoulder has been designed to absorb and compensate for ground movements, estimated over a period of 20 years. To ensure the efficiency of the work, periodic repositioning of the supports is planned.

The geotechnical and structural monitoring system with continuous readings will allow the concessionaire to accurately manage the realignment of the supports and to define, with reliable data, any future interventions to mitigate the movement of the slope.