Illustration EXCAVATION BEGINS FOR THE LYON-TURINO TUNNEL ENTRANCE ON THE FRENCH SIDE!
Document

EXCAVATION BEGINS FOR THE LYON-TURINO TUNNEL ENTRANCE ON THE FRENCH SIDE!

December 8, Implenia Switzerland (leader), Implenia France, NGE, Itinera and Rizzani De Eccher began the excavation work for the entrance of the Lyon-Turin tunnel.

Preparation and installation work started in December 2021 are now finished. Excavating now begins.

794 jet grouting columns were created, a luthetian wall equipped including two layers of prop and with 12,550 metres of anchorage blocks was built to allow the beginning of the excavation in soft ground, under a tunnel roof.
290,000 tonnes of materials were excavated to clear the tympanum area (approximately 600,000m3 for the project overall).