Projects
Grouft Tunnel
Category
Grouft Tunnel
The centerpiece of the northern motorway.
The Grouft tunnel is part of the Route du Nord, and connects the Plateau Haeschtreferbierg in the south to the Vallée de l'Alzette in the north. It is 2,966 meters long.
It is made up of 2 separate tubes of unidirectional circulation.
The downtube towards Mersch has 2 lanes plus the exit ramp at the approach to the Lorentzweiler interchange. The tube to Luxembourg has been fitted with a third track for heavy goods vehicles.
The excavation was done by coming from the North and South sides of both tubes at the same time, in other words from 4 simultaneous fronts.
2,966m
Lenght
800,000m3
Excavation
170,000m3
Shotcrete and surfacing concrete
Construction details
Details of the structure :
- The width of the excavation is 11 metres for the 2-way tube and 15.5 m for the 3-way.
- With regards to elevation, the tunnel has a maximum longitudinal slope of 4.63% from the portal of the ‘Vallée de l'Alzette’, ie a vertical drop of 130m.
- Almost the entire length of the tunnel passes through forests and fields.
Félix Giorgetti was responsible for the following :
- Platforms for the installation of construction sites;
- Earthworks for the north and south entrances to the tunnel, including the reinforcement of the walls;
- All road works outside and inside the tunnel.
Key Figures
Horseshoe shape and / or counter-vault
(3 lanes up / 2 lanes down)
2 parallel tubes
Galleries at a distance of 300m each, of which 3 are suitable for vehicles
10
Operating buildings
3
Emergency bays at a distance of 100m each
62
Underground excavation length
2 x 2,966 m
Pavement width
7 to 10.50m
Useable width
10 to 13.50m
Typical excavation profiles
69.50 to 111.70m²
Excavation volume
800,000m3
Concrete in the inner ring
75,000m3
Projected concrete of the outer ring
70,000m3
Rock bolts
100,000
Metal support
11,000t
Underground waterproofing
190,000m2
Longitudinal slope
max. 4.63
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