Klauser- and Traunfried Tunnel

A9 Pyhrn Motorway


Autobahnen- und Schnellstraßen-Finanzierungs-Aktiengesellschaft (ASFINAG)


BeMo Tunnelling GmbH (BeMo) (technical sponsor)
50% in JV with Wayss & Freytag Ingenieurbau AG (commercial sponsor)

Project location

Klaus a. d. Pyhrnbahn, Austria

Start of construction


End of construction


Project total value

31.3 million €


Northern Limestone Alps
Mainly carbonate rocks of the middle and upper Trias.

Predonderant nature of mountain:
Hillside debris/rubble (little in portal area); dolomite (ranging from low to heavily fragmented), Limestone (bulky up to heavily fragmented);
Shale / clay marl,

Technical Data

Completion Tunnelkette Klaus:
Completion of the A9 Pyhrn-motorway with creation of the tunnels Klaus and Traunfried, construction of the tunnel entrances and adaptation of the service turnaround lane Pertlgraben.
Lot 4:
Tunnel Klaus Easttube total length: 7,106 ft/2,166 m
Intermediate heading Frauensteinerstraße North Portal, Open cut tunnelling North (91+229 ft/28+70 m), Cut & Cover method (36 m/118 ft), Mining technique (1,857m/6,092.5 ft), tunnelroof already driven (emergency escape), bench and invert excavation, interior works

Tunnel Traunfried Easttube total length: 2,467 ft/752 m
Roof, bench and invert excavation, interior works
In addition: Electro-technics, remodelling of the Klaus elevated tank, fire water supply, operating stations and collectors, water pollution control facility

The bridges (lots 1-3) and road works (lot 7) are built either in advance or simultaneously to the tunnel objects.