Farrisbrua

The Farrisbrua (Farris Bridge) is a major new road bridge crossing the Farris water just north of Larvik, Norway. The bridge is part of the expansion of the E18 motorway from the antiquated single carriageway to modern dual carriageway standards, enabling increased speeds and traffic volumes between the eastern and southern parts of the country. It was built between 2013 and 2018, to a cost of 718 million NOK (excl. VAT).[1]

Farrisbrua
Photo: Petter Ulleland
Coordinates59.056520°N 10.010844°E / 59.056520; 10.010844
CarriesMotor vehicles
CrossesFarrisvatnet
LocaleLarvik, Norway
Characteristics
DesignCable-stayed bridge
MaterialConcrete and steel
Total length570 metres (1,870 ft)
Width28.0 metres (91.9 ft)
Height70 metres (230 ft)
Longest span28 metres (92 ft)
History
Construction start2013 (2013)
Construction endExpected January 2018
OpenedMarch 2018
Location

Dimensions and structure

Farrisbrua is 570 m in length and 28 m wide. It goes in a horizontal curve around the southern bank of the Farris water. Mainly built in concrete, the 120 meter middle section is a cable-stayed bridge in steel with concrete towers 70 meters tall. The bridge also has a slight incline from the east to the west, up to the tunnel in Martineåsen.

The bridge's biggest foundation is that of the tower. This foundation is made of 12 pillars, steel tubes measuring 2 meters in diameter, drilled through the moraine masses down to bedrock, then filled with armour and concrete. The depth down to bedrock is around 80 meters. On top of these pillars, a concrete plate was made, 4 meters thick and covering 0,247 acres. There are also 9 smaller foundations varying in size.[2]

Construction
The Farris bridge under construction on 7 June 2017

The expansion of the motorway from Oslo to Kristiansand (and then onwards to Stavanger) was proposed many decades ago, but due to the slow political process,[3] the actual construction is still ongoing. The construction of the Farris bridge was finally agreed upon as part of the building of a 7 km stretch of motorway between Bommestad and Sky. Building started in 2013 and completion scheduled for New Year 2018. After a three-month post-ponement,[4] the bridge finally opened in March 2018.[5][6]

The bridge was built by Joint Venture Farris Bru ANS. Initially, it was Polish Bilfinger Infrastructure (65%) and German Bilfinger Constructions (35%) who formed this joint venture and obtained the contract. The two companies were bought by Austrian PORR and Swiss IMPLENTIA in 2015, continuing the work from there.[7]


Literature

See also

References
  1. https://www.vegvesen.no/Europaveg/e18larvik
  2. https://www.vegvesen.no/Europaveg/e18larvik/ek2
  3. https://www.nettavisen.no/3241075.html
  4. https://www.op.no/nyheter/e18/farrisbrua/utsetter-apningen-av-farrisbrua-i-tre-maneder/s/5-36-476839
  5. https://www.nrk.no/vestfold/proveapning-av-farrisbrua-i-larvik--1.13970213
  6. https://www.youtube.com/watch?v=__sFfEe-lb0
  7. https://www.vegvesen.no/Europaveg/e18larvik/ek2
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