{{Short description|Box girder bridge in Stockholm, Sweden}} {{wide image|Alviksbron 2008a.jpg|800px}} thumb|Alviksbron '''Alviksbron''' (Swedish for ''The Alvik Bridge'') is a box girder bridge in central Stockholm, Sweden. Stretching over Oxhålssundet, it connects Stora Essingen island to the western suburb Bromma. Built 1996-1998 by the Nordic Construction Company at a cost of 180 million SEK, it has served the Tvärbanan light rail line and pedestrians and bicyclists since its inauguration in August 2000.<ref name="NCC">{{cite web | title = Alviksbron, Stockholm | publisher = NCC | date = 2006-10-17 | url = http://www.ncc.se/templates/GenericPage____2350.aspx | archive-url = https://web.archive.org/web/20070927064112/http://www.ncc.se/templates/GenericPage____2350.aspx | url-status = dead | archive-date = 2007-09-27 | accessdate = 2007-01-24 |language=sv}}</ref> The name is derived from Alvik, originally a local manor house built in 1819 and demolished in 1930.<ref name="Gatunamn">{{cite book | title = Stockholms gatunamn | edition = 2nd | year = 1992 | publisher = Kommittén för Stockholmsforskning | location = Stockholm | isbn = 91-7031-042-4 | pages = 491 | chapter = Västerort: Alvik }}</ref>
The bridge is 400 metres in length with a 140-metre central span and a horizontal clearance of 24 metres. The underside of the bridge tie forms an arch intended to make the bridge as slender as possible. The two pillars standing in the water each consist of two thin concrete plates dressed in two-quarters brick with a common concrete foundation. They are illuminated after dark.<ref name="NCC" />
The construction is pre-tensioned longitudinally by cables, but non-tensioned across. The topside was stretched as the separate sections were added, while the underside was stretched after all the sections had been cast into a single compact unit.<ref name="LTU">{{cite web | author = Björn Täljsten |author2= Arvid Hejll | title = Tvärbanebroarna Gröndal och Alviksbron | publisher = Luleå tekniska universitet | year = 2005 | url = http://epubl.ltu.se/1402-1536/2005/01/LTU-TR-0501-SE.pdf | accessdate = 2007-01-24 |format=PDF|language=sv}}</ref>
Three years after the inauguration crack formations were discovered in the bridge. The shear fissures in the ribs had an angle of 25-30° and a length of 0.1-0.3 mm, and were found in greater number on the south side. This is thought to indicate that compressive stress from the longitudinal stressing in combination with heat from the sun caused the problem. The bridge was then reinforced, first temporarily using outside pre-stressing bars, and then permanently using carbon fibre laminates in sections with minor fissures, and tie struts in the worst affected sections. <ref name="LTU" />
== See also == * List of bridges in Stockholm * Skansbron * Gröndalsbron * Fredriksdalsbron
== References == {{Reflist}}
== External links == * [https://www.flickr.com/photos/lowdincom/80812556/ flickr - Photo of Alviksbron in winter] (January 2006)
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Category:Bridges in Stockholm Category:Bridges completed in 1998 Category:Box girder bridges Category:Rail infrastructure in Stockholm County Category:1998 establishments in Sweden Category:1990s establishments in Stockholm
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