A joint venture led by Implenia won the contract for Lot 2 “Tunnel Ligerz” as part of the double-track expansion Ligerz–Twann
and railway technology. In addition, four escape tunnels, a 114 m long viaduct for the exit of highway N5 and various additional structures are being built.
The excavated material will be transported by ship and the existing railway line will be dismantled and redesigned.
The aim of the project is to eliminate the last railway bottleneck on the “Jurafuss” line between Lausanne and Biel. Due to the prevailing narrow space conditions between the lake and the slope, where the N5 national road and the cantonal road also run, a new double-track tunnel will be built. The location of the project in protected areas is also a particular challenge: The region is listed in the Federal Inventory of Landscapes and Natural Monuments (BLN). The villages of La Neuveville, Chavannes, Ligerz and Twann are part of the Federal Inventory of Swiss Heritage Sites of National Importance (ISOS).
Implenia‘s experts in the fields of civil engineering, tunnelling, special foundations, civil structures, railway engineering and maritime work are being deployed.