W&F Limmern Access Tunnel I

Limmern Access Tunnel I

Switzerland

Limmern Access Tunnel I

Switzerland

Limmern Access Tunnel I

Switzerland

Limmern Access Tunnel I

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

New Culvert Brunsbüttel Lock

Germany

Increase in the shipping capacity of the Kiel Canal (Nord-Ostsee-Kanal): Pipe jacking for a pipeline tunnel 35 m below ground during ongoing lock operation.