Construction of a new road tunnel in Italy is progressing well despite some very challenging ground conditions.
The new twin bore Renazza Tunnel, on the A3 Salerno to Reggio Calabria highway, is being built through fragile sands and clays and the almost alongside a previous bore that collapsed soon after construction 20 years ago.
Main contractor SIS has subcontracted the excavation work to Carlomango Gaetano which is currently advancing the tunnels at 4m per day using a Case CX350B crawler excavator fitted with a hydraulic breaker. Due to the previous tunnel collapse, there is considerable focus on strengthening work ahead of the excavation. Post excavation support in the tunnels is being provided by precast concrete arches.
Material excavated from the tunnel is being used to restore a local quarry.