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ASCE Seattle General Section - February Joint Dinner Meeting - Norways Submerged Floating Tunnel Concept and Design
Hilton Bellevue
Bellevue, WA
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Overview:  If you want to drive the 680 miles from Norways bustling southern port of Kristiansand to Trondheim in the north, be ready to spend 21 hours in the car.  Thats an average of 30 miles per hour, and you have the countrys signature geological features to thank.  The route along highway E39, crosses eight gorgeous but inconvenient fjords, and that means eight ferry trips.

Now, a $25 billion infrastructure project promises to cut the trip to just 10.5 hours, by installing permanent crossings across those fjords by 2035.  Because many of these waterways are wide and the largest is nearly a mile deep, a typical bridge wont do.  Norway is considering fording its fjords with something the world has never seen before: a submerged floating bridge.

The Norwegian Public Roads Administration (NPRA) has been commissioned by the Norwegian Ministry of Transport and Communications to develop plans for a ferry free coastal highway E39 between Kristiansand and Trondheim. Along this route are a total of 8 ferry connections, several of which are too wide and deep to be crossed with conventional bridge or tunnel technology. For some of these fjords, a floating submerged tube bridge (SFTB), also called Archimedes Bridge or Submerged Floating Tunnel, could be an alternative. An SFTB concept for the Bjørnafjord crossing has been developed by a consortium consisting of the companies Dr Techn Olav Olsen, Norconsult, Reinertsen and others. The SFTB was one of three main concepts, the two others being floting bridges. Two SFTB designs were developed. They are in essence the same, apart from the station keeping system. One alternative uses  tension leg mooring to the seabed, whereas the other is vertically stabilized by means of floating concrete pontoons. The presentation will go through the design philosophy, including environmental and geological conditions, the main challenges related to structural design as well challenges related to existing rules and regulations, and some safety aspects of SFTBs.

Presented By:  Tale Egeberg Aasland, Bridge Engineer with Norway Public Works, PhD Candidate in hydrodynamics with the Norwegian University of Science and Technology.
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Location

Hilton Bellevue (View)
300 112th Avenue SE
Bellevue, WA 98004
United States

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Kid Friendly: No
Dog Friendly: No
Non-Smoking: Yes!
Wheelchair Accessible: Yes!

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