e-mosty June 2017: Osman Gazi B. US Suspension. Hålogaland B. e-mosty June 2017: Suspension Bridges | Page 18

3.4 The Deck
The stiffening girder is a steel box and constitutes the
actual bridge deck in the suspension span. This is
constructed as a closed steel box with trapezium-
shaped stiffening trusses and transverse bulkheads in
30 segments. All boxes are 18.6m wide, comprising:
27 segments are 40m long, 2 segments are 19.2m
long and 1 segment is 23m long.
They will be transported to the site using a ship with
boxes placed on top of each other (see Drawing in the
magazine on page 23 “Stowage plan of transportation
vessel”).
They will be lifted directly from the ship by floating
crane to their final position and attached to the
suspension hangers, which are attached to the main
cable at 20-metre intervals. The middle section will be
installed first, and further installations will be made
symmetrically from the middle.
After all 30 segments are lifted to correct position
they will be welded together.
The steel boxes are dehumidified inside by dry air
being blown through them. A transport vehicle with
room for two people is installed inside the steel box,
for future inspections and maintenance.
3.5 The Viaducts
The length of the concrete viaducts is 244m and
152m. On the Karistranda 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.
Figures 23 +24: Steel deck segments prefabrication in a workshop
References:
FORSBERG, Torben – PIHL, Jesper: Hålogaland Bridge Cable Structures. 35 th Annual Symposium of IABSE / 52 nd
Annual Symposium of IASS / 6 th International Conference on Space Structures, London, September 2011
NCC Group
https://www.ncc.group/our-projects/halogaland-bridge/
Statens Vegvesen, www.vegvesen.no
http://www.vegvesen.no/Europaveg/e6halogalandsbrua/Nyhetsarkiv/e6-h%C3%A5logalandsbrua-ferdig-
%C3%A5-trekke-b%C3%A6rekablene
2/2017