Temaer og prosjekter,
Tunnel og tunnelrehabilitering
Start of excavation work at the entrance to the Lyon-Turin tunnel on the French side
already proved to be extremely demanding: a total of 794 jet grouting columns were constructed to improve the mechanical properties of the soil in the alluvial zone, as well as a “Parisian wall” consisting of piles (1’186) and nails (12’595). For the excavation of the "spandrel zone", 290,000 tons of material [...] the first stirrup began the week after the blessing in honor of the patron saint, Saint Barbara – a symbolic and at the same time moving moment for all the miners working on the project. Of the total length of the two tubes of the tunnel, i.e., 5,678 km, more than 1’000 meters will be built as an umbrella[...]