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

General data

Project
Limmern Access Tunnel I, Section A1
transportation tunnel to the machine cavern
of the new extension to Limmern Pumped Storage Power Plant

Client
Kraftwerke Linth-Limmern AG (KLL)

Contractor
Wayss & Freytag Ingenieurbau AG
in a joint venture

Construction period
October 2009 to May 2013

Construction costs
€ 89 million

Utilisation
Logistic
Type
Access tunnel
Length
3,762 m
Construction Method
tunneling using Gripper TBM- aswell as drill and blast tunneling
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