Excavation Begins for the Lyon-Turino Tunnel Entrance on the French Side
On December 8th, Implenia Switzerland (leader), Implenia France, NGE, Itinera and Rizzani De Eccher began the excavation work for the entrance of the Lyon-Turino tunnel.
The preparation and installation work started in December 2021 are now finished. Excavating now begins. 794 jet-grouting columns were created, a luthetian wall equipped with two layers of prop and 12,550 meters of anchorage blocks was built to allow the beginning of the excavation in soft ground, under a tunnel roof. 290,000 tons of materials were excavated to clear the tympanum area (approximately 600,000m3 for the project overall).