Limfjord Tunnel

limfjord2
Aalborg, Denmark
The Limfjord Tunnel is an immersed tube tunnel constructed in 1969. It is a concrete box with two tunnel tubes - each carrying 3 lanes of motorway traffic.
limfjord
Ministry of Public Works (DK)
The tunnel elements by NYBYG; approaches by Monberg & Thorsen A/S; Christiani & Nielsen A/S carried out the installation of the elements, including sandjetting.
Christiani & Nielsen A/S
102
510
20.8
5
6
8.54
27.4
Surcharged sandfill replacing existing soil was used to support immersed tunnel. Tension piles
Cast in a casting basin excavated for the purpose, about 10 km from the tunnel site. Elements were cast in 12.8 m long sections - first the bottom; then the walls; and, last, the roof. The sectionswere separated by a 1.8 m gap into which rebars protruded.
Elements were outfitted at a
Four straddling placement barges were used. Horizontal alignment was accomplished by lines
Gina type. Special gasketted
The elements are waterproofed with a 2 mm butyl membrane, protected on the bottom by a 9 cm
Sandjetting
No cover provided. 20 cm of reinforced concrete is the only protection to the waterproofing layer.