What is a floating bridge
Oslo, November 15, 2018. Two teams have won the competition to develop concepts for a floating bridge over the Bjørnafjord. On November 14th, Helge Eidsnes, Regional Director of the Norwegian Road Administration (NPRA), signed contracts with the Aas-Jakobsen team, COWI and Multiconsult with Johs Holt and with the Norconsult team, Dr Techn. Olav Olsen and Prodtex. Work will start in November 2018.
The NPRA has been busy crossing the Bjørnafjord since 2009. The construction of the bridge is part of the E39 coastal road to a ferry-free highway. The fjord is five kilometers wide and almost 600 meters deep. The road authority announced that crossing the fjord will depend on the development of new bridge technology.
The two consulting teams work in parallel on the development of new technologies and examine four different floating bridge concepts:
- Option 1: floating bridge. The bridge is only held at each end.
- Option 2. Floating bridge including anchoring system. The anchor ring system is only activated by a possible extreme event and, in such a situation, can prevent progressive fracture development for the structure.
- Option 3. Floating bridge as a girder bridge. The bridge is held at each end and has anchor lines for anchors on the seabed. The anchoring lines ensure the necessary strength of the bridge in the horizontal plane. The bridge is aligned in the horizontal plane.
- Option 4. Floating bridge like option 3, but only the chain of the bridge is straight. The floating bridge is curved.
Based on the work of the advisory groups, the NPRA will make a decision on the floating bridge concept for Bjørnafjord in 2019.
The construction and development offices that took part in the tendering process joined forces with companies from the fields of transport and bridge construction as well as offshore and ship technology in order to be equipped with the necessary expertise, announced the road authority. Both groups are expected to receive contracts by August 2019 with the option to expand the contract.
“This is perhaps the most challenging project in Norway today and we look forward to moving this project forward,” says Svein Erik Jakobsen, Aas-Jakobsen, Project Manager for Team One ..
The floating bridge will replace the ferry crossing, which now takes 40 minutes. The journey across the fjord over a bridge takes eleven minutes. According to the Norwegian Public Roads Administration, a more predictable travel route with significantly reduced travel time means a great social gain.
The floating bridge will be five kilometers long and have four lanes. The speed is limited to 100 km / h. A separate lane is planned for pedestrians and cyclists.
Read more about the expansion of the E 39 coastal road here.
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