Infrastructure,
Service tunnels,
Tunnelling,
Transport tunnels
Galerie de sécurité du tunnel du Fréjus
of 1 assembly cavern (L=41ml and S=230m2), excavation and lining of the adit with 6,405ml, 4 technical stations (L=30ml), 1 technical adit with 250ml, 2 bypasses with 25ml, 1 pickling adit (L=489ml, P=15%) were carried out. One assembly cavern (L=41ml and S=230m2), the excavation and lining of the adit [...] adit with 6 405ml, 4 technical stations (L=30ml), 1 technical adit with 250ml, 2 bypasses with 25ml, 1 pickling adit (L=489ml, P=15%) were completed. The difficult geology was the biggest challenge in this project. The first 600 metres, which were dug by blasting in large sections (70 m² to 230 m²) and[...]