Technical specifications

Scope of work

• Length of access tunnel (inclined tunnel): 3,762 m
• Gradient: 24%
• Internal diameter: min. 7.30 m
• Portal structure / cut and cover tunnel
  length: 18 m
• Horizontal access tunnel to valley station,
  length: 219 m
• Excavated cross-section: approx. 70 m²
• Cavern of valley station,
  length: 35 m, excavation volume: 9,500 m³

Construction method

• Inclined tunnel: tunnelling using a Gripper-TBM
• bore diameter of TBM: 8.03 m,
• lining: anchors, wire mesh reinforcement and 2 layers of shotcrete;
• access tunnel to valley station: drill and blast method with sprayed concrete support
• cavern of valley station: drill and blast method

Geology
Quintner limestone with karstic features