“San Vito” Gallery (Italy)

The tunnel has a length of about 3 km with variable cross section along the development as the roadbed varies from 2 to 3 lanes. The width of the roadbed is 9.3 m and 12.80 m respectively. The height of the tunnel varies from 8.55 to 7.08 m.
The damages noted are mainly:
1) moisture stains and run-off marks on the vault;
2) problems on the water catchment and removal network.
Action was taken with:
– a continuous intervention on the entire surface of the vault to totally restore the waterproofing in the most damaged area;
– sealing of cracks and water seepage by injection of polyurethane resin, after hydro-scarification and cleaning of the existing deteriorated concrete and subsequent restoration of the removed parts with fiber-reinforced mortar.
– maintenance of existing manifolds;
– installation of a new collector alongside the existing one for a section of the tunnel.