Reference of the Month – June 2019

Norsk Stål has supplied welded pipes and beams for the reinforcement of Osstrupen Bridge in Florø

Foto: Liv Standal

Osstrupen Bridgeis a bridge from 1976 that was built carry its own weight. The bridge is constructed with a cantilever and was intended to “sink” down to the desired height in a few years. This did not happen. The bridge continued to sink.

After several years of research at Sintef, DNV and others, four different options should be investigated: Composite pipes, seamless pipes, welded pipes or tearing down the bridge and start from scratch.

Foto: Liv Standal

Finally the choice landed on welded pipes. The steel quality chosen was DNVGL-OS-B101-2015-VL E550Z35 with a few modifications. Piping dimensions was Ø – 610 x 25mm. Total amount of steel was approximately 144 tons.

We also delivered approximately 50 tons of steel beams in S460M quality delivered from new rolling at Arcelor Mittal.

Due to quality requirements and delivery time, this became a demanding project. Close cooperation between the builder, Westcon and the suppliers made it possible to successfully deliver to this project.

Several hundred similar bridges have been built in Norway, and it is believed that they may have similar issues to Osstrupen Bridge. Hence we’re very curious to see of any similar assignments will cross our paths in the near future.

Client: Statens Vegvesen General contractor: NCC Vest Steel contractor: Westcon Florø