CHF 220 Million Tunnel Project

The project involves constructing a 2.1 km long twin-track tunnel in Ligerz, Switzerland. The total contract value is CHF 220 million, with Implenia's share amounting to around CHF 150 million. The tunnel aims to eliminate the last railroad bottleneck on the Jura river line between Lausanne and Biel.

Mining and Cut-and-Cover Methods

The construction will utilize the mining method for approximately 1,850 meters and cut-and-cover for around 250 meters. Additional structures include four escape tunnels, a 114-meter-long viaduct for the N5 highway exit, and various other structures. The material excavated will be transported by ship, and the existing railroad line will be dismantled and redesigned.

Multidisciplinary Expertise in Protected Areas

Implenia experts from various areas, including civil and tunnel construction, special and civil engineering, railroad engineering, and maritime work, are involved in the project. The project poses particular challenges due to its location in protected areas listed in the Federal Inventory of Landscapes and Natural Monuments (BLN) and in the Federal Inventory of Swiss Sites of National Importance (ISOS).

Construction Timeline: 2024-2026

The project's timeline includes the start of construction in September 2024 and completion by December 2026. The building owner is SBB, and the project is managed by ARGE IBD, which includes Implenia as the lead partner, along with Bernasconi and De Luca.