Employer
Canton of Obwalden, CH-6061 Sarnen
Department of Building and Spatial Development
Office for Forest and Landscape
Department Natural Hazards
Designer
of the consortium:
- Gruner AG, CH-4020 Basel
- ewp bucher dillier AG, CH-6005 Luzern
Time of Completion
09.2018 – 12.2023
Execution of the Work
ARGE HWS Marti (turnkey project)
Consortium Partners
Marti Tunnel AG, CH-3302 Moosseedorf
Marti Bauunternehmung AG Lucerne, CH-6002 Lucerne
Lead Company – Technical and Commercial Lead
Marti Tunnel AG, CH-3302 Moosseedorf
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Scope of the Works
Sarner Aa with flood discharge tunnel east 6.5 km and flood protection Kernmattbach with a
vertical shaft Raise Drill 80 m
Two building pits, outlet structure and Kernmattbach
Work description
Turnkey project
- Construction works as well as project planning (construction project, submitted project (building permit), execution project)
Flood discharge tunnel
- Building pit outlet structure
- Tunnel with a 0.2% gradient
- 6.3 km hard rock Gripper-TBM with a diameter
of 6.5 m
- Drill & Blast / mechanical excavation 250 m (start and finish gallery) under sensitive structures (pressure tunnel, railway line) with low overlap (1.39 m)
- Single invert segment (tubbing)
- Rock support including anchors, steel mesh, shotcrete, steel arches
- Inner shell: single layer, shotcrete, without
waterproofing layer
Vertical shaft and excavation pit Kernmattbach
- Excavation pit between stream and steep slope
- Shaft: H = 80 m D = 3.6 m
- Raise drill
- Single-layer in-situ concrete
Excavation pit outlet (starting pit TBM)
- Flood protection dam along river Sarner Aa
- Near sensitive development (barrage Wichelsee, pressure tunnel)
Contact
Marti Tunnel AG
Seedorffeldstrasse 21
CH-3302 Moosseedorf
Tel. +41 31 388 75 10
tunnel@martiag.ch
