Works on the North Sea bed:
Renovation of the Limfjord Tunnel, Denmark
The Limfjord tunnel is one of two road links between North and South Aalborg. The tunnel comprises seven prefabricated segments whose surface was concreted during construction between 1965 and 1969, then lowered onto the fjord bed and connected using construction joints.
The leaking construction joints that occurred shortly afterwards led to seawater penetrating the inside of the tunnel, which required repair.
Job Report – Factsheet
- Project: Limfjord undersea tunnel, Aalborg, E45, Denmark
- Contractor: Vejdirektoratet [Danish Road Directorate]
- Special feature: First use of the Type 4 telescopic robot, concrete strength B75, working 24/7
- Equipment technology: Telescopic robot and standard robot
- Unit: KD 412, 1000 bar
The twin-tube undersea motorway tunnel was renovated in two construction phases.
The purpose of the renovation was to stop the seawater penetration and to reconstruct the concrete damaged by the highly salty North Sea water. This meant up to 20 cm of concrete had to be removed around the construction joints on walls and ceilings.
Fact: Total 1700 m³ concrete cutting (25 cm thick)