W&F Limmern Access Tunnel I

Zugangsstollen I Limmern

Switzerland

Zugangsstollen I Limmern

Switzerland

Zugangsstollen I Limmern

Switzerland

Zugangsstollen I Limmern

Switzerland

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

Related Projects

Utilisation

Logistic

Type

Access tunnel

Length

3,762 m

Construction Method

tunneling using Gripper TBM- aswell as drill and blast tunneling

Related Projects

Cross River Rail Project

Australia

The State of Queensland in Australia expects new urban development and economic opportunities from the Cross River Rail infrastructure project. Wayss & Freytag Ingenieurbau is involved in this ambitious infrastructure project.