S.S. 470 – Val Brembana Costruzione of the S. Pellegrino variant

Construction of road lot for a length of 3,000 lm including:

– 2 tunnels for a total length of 2,100 lm

– 1 viaduct with metallic scaffold

– Various miscellaneous works and moving materials

Excavation of the tunnels was preceded by execution of a pilot tunnel with T.B.M. Ø 3.50

The tunnels were built with TBM Ø 11.80 and cladding in prefabricated shells