Grenlandsbrua
Coordinates: 59 ° 3 ′ 11 " N , 9 ° 40 ′ 32" E
| Grenlandsbrua | ||
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| use | Road bridge | |
| Convicted | Europastraße 18 | |
| Crossing of | Frierfjord | |
| place | Porsgrunn , Bamble | |
| construction | Cable-stayed bridge | |
| overall length | 608 m | |
| width | 12 m | |
| Longest span | 305 m | |
| height | 166 m | |
| Clear height | 50 m | |
| opening | July 19, 1996 | |
| planner | Aas-Jakobsen | |
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The Grenlandsbrua is a road bridge in the south of the Norwegian province of Vestfold og Telemark , which spans the Frierfjord between the municipalities of Porsgrunn and Bamble halfway between Oslo and Kristiansand .
description
The bridge, opened by King Harald V in 1996 , is part of European route 18 , which was completely redesigned as a two-lane, intersection-free, motorway-like route in this area to relieve the older Breviksbrua , 1 km further east . The Grenlandsbrua, which is 608 m long and crosses the fjord with a clear height of 50 m, connects directly to the 2.2 km long Kjerholt Tunnel in the north; at its southern end the 760 m long Bamble Tunnel begins after a few meters.
It has two lanes with narrow hard shoulders, but no sidewalk and is therefore only 12 m wide.
The single-hip cable - stayed bridge has a 166 m high, H-shaped pylon made of reinforced concrete on the north bank, the stay cables of which on one side support the bridge deck over the main opening with a span of 305 m. The only 67 m long side opening on its other side is supported by two ropes on either side of the bridge deck. It ends directly at the tunnel portal. The remaining stay cables are anchored in the inclined mountain slope above the tunnel entrance behind striking concrete structures in the rock.
The bridge deck is a composite structure made of a steel, trapezoidal hollow box with a cover made of a concrete slab with edge beams, whereby a special lightweight concrete (LC 55) was used in the braced part . The main opening is followed by 4 fields, each 48 m long, and an end field with 44 m, which are supported by concrete pillars.
The Grenlandsbrua was planned by the engineering firm Aas-Jakobson in collaboration with the architects Lund & Slaatto and Lunde & Løvseth and was awarded the Betongtavlen award.
The pylon was - after a series of transmission masts and towers - Norway's tallest structure, but has since been replaced by the pylons of the Hardangerbrua .
Web links
- Grenland Bridge (PDF; 446 kB) Reference sheet of the engineering office Aas-Jakobsen