With its type, diameter of 10.43 m and length of 334 m, this machine is a first in France!
This choice of gripper tunnel boring machine is explained by the geology likely to be encountered: relatively compact, homogeneous and stable; it is also motivated by the great depth of the work to be carried out (2,200 m of cover) and the associated geotechnical phenomena.
Under 2,200 m of cover, the two hard rock tunnel boring machines will excavate 2x18 km of the base tunnel's two tubes. From the foot of the Villarodin-Bourget/Modane downhill tunnel, they will cross the Italian border!
Owner: TELT Lyon Turin
ELYOT Group: Eiffage Génie Civil, Spie batignolles, GHELLA COGEIS S.P.A.