Improvement works in different railway tunnels

Project

Design and rehabilitation works concerning 4 single-tube with double-tracks; execution of the works maintaining railway traffic on a track.

Key data

• Paradiso tunnel (L = 768 m)
• S. Martino tunnel (L =   53 m)
• Maroggia tunnel (L = 570 m)
• Molino tunnel (L =   10 m)
• Installation of the temporary ballast;
• Removal of the railway superstructure;
• Installation of the new railway structure with the new sleepers and rails;
• Concrete slab lowering; construction of the new concrete foundation;
• Underpinning/Wall replacement/Tunnel enlargement (Maroggia tunnel);
• Demolition works in San Martino tunnel; realization of the new supporting wall, with an anchored bulkhead;
• Horizontal and vertical rail tracks moving;
• Installation of new drainage pipes and inspection wells; 
• Replacement of the cable conduit;
• Refurbishment of the evacuation/drainage systems and of existing infrastructure;
• Adaptation works for the infrastructural railway system.

Costs

CHF 125'000’000

Timeline

2011 – 2015 Design
2015 – 2020 Construction

Clients

Swiss Federal Railway Company (SBB)

Services

• Civil engineering design
• Construction management

Phases

• Preliminary design (SIA 31) / (excl. Molino)
• Final design (SIA 32)
• Permit obtaining procedure (SIA 33)
• Tender design (SIA 41)
• Construction design (SIA 51)