Hålogaland Bridge

NCC is to construct two pylons and two viaducts for Hålogaland Bridge in Nordland county in Norway. The total length of the viaducts will be 400 m.

Norway´s second longest suspension bridge

The E6 expressway Hålogaland Bridge will be Norway's second longest suspension bridge when it opens to traffic in 2017. The total length of the bridge is 1,533 m with a span of 1,145 m. NCC is carrying out concrete works on the Hålogaland Bridge.

Use of slip forming

NCC's assignment includes concrete work on the pylons and the two viaducts, which involve pouring 32,000 m³ of concrete and laying 5,400 tons of rebar. The contract also includes the blasting and removal of about 10,000 fm³ of rock and establishing anchoring trays in the rock, to which the suspension cables are attached.

The foundations for the Hålogaland Bridge pylons are under water, meaning that five caissons, with a 10 m diameter, were manufactured and placed at a depth of about 30 m. These caissons were filled with stone material as ballast, and a fender plate was cast on top. NCC decided to manufacture the caissons by using the slip forming technique. It was the first time that slip forming of caissons was permitted by the Norwegian Public Roads Administration. Slip forming is a construction method whereby concrete is cast in layers in a slip form that is raised at regular intervals. A total of 3 m of the foundation was cast and then lowered into the water every day during the production of the concrete caissons for the Hålogaland Bridge. NCC has solid expertise in slip forming and engaged its subsidiary Interform for this assignment. The actual underwater work for positioning the caissons was performed by NCC's subsidiary Sjøentreprenøren.

The height of the pylons is about 180 m. Climbing formwork was used on the pylons from the caissons up to the height of the viaducts. The slip forming method was again used for the concrete works on the pylons from this height. NCC's contract also included establishing interior stairwells in the pylons.

The length of the viaducts is 250 m and 148 m. On the Narvik side, the viaduct was constructed by using a specially manufactured movable casting carriage. It was almost 120 m long and weighed 800 tons. The casting carriage stretched across the E6 expressway all the way to the first pylon. The viaduct on the Øyjord side was constructed at ground level and lifted into place.

Facts about the bridge

  • The two suspension cables that hold up the main span of the bridge have a diameter of 47 cm and are 1,621 m long.
  • The sailing height in the Rombak fjord will be 40 m and the sailing width 200 m.
  • The total width will be 18.6 m, while the viaducts will be 15.4 m wide.
  • The roadway will be 9.5 m wide including a one-meter central reservation.
  • The speed limit will be 80 kph.
  • NCC’s contract is for 32,000 m3 of concrete and 5,400 tons of rebar.
  • The bridge will also have a footpath and bicycle path.

Read more about the technical specification on the Norwegian Public Roads Administration’s website.

Illustration: Cowi AS/Norwegian Public Roads Administration

Svein-Arne sivertsen
Svein-Arne Sivertsen

District Manager DK Nord, NCC Infrastructure