TUNNELS - Motorway A3 SA - RC
Modernization and adaptation works of "Autostrada A3 Salerno - Reggio Calabria" from junction Sicignano (km 53,800) to junction Atena Lucana (km 82+330). Motorway A3 Salerno - Reggio Calabria is one of the most important and troubled works of the Italian infrastructural system. SSGAI S.r.l. was responsible to revise the detailed design, variations during construction design, maintenance plan. SGAI S.r.l. did also as built editing of 28.530 km of road, considering sections extension of road in service and realisation of new revised segments. In this projet SGAI S.r.l. design some works that can be summarized in the following sectors: geotechnical, civil engineering, structural, roads, drainage and hydraulic regulation, roads lighting systems. Designed works by SGAI S.r.l. included:
- Two new tunnels: "Tanagro" and "Costa Incoronata". Both are double fornix (total 6,4 km);
- Enlargement of three tunnels ”Castelluccio”, “Baldassarre” and ”Intagliata” (total 2,7 km);
- One artificial tunnel "Lontrano".
Both fornix in ”Castelluccio” and “Baldassarre” tunnels are enlarged. In "Intagliata" tunnel is enlarged underground only one fornix (south roadway), other one is demolished and the carriageway is restored in an artificial tunnel. Excavation in ”Castelluccio” and ”Intagliata” tunnels are made after ground consolidation. For all tunnels SGAI S.r.l. made analysis of soil behavior during underground excavation, identification of consolidation interventions, pre-coating, definitive coating, definition of monitoring program for excavation control.