Alviksbron (

Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...

for ''The Alvik Bridge'') is a

box girder bridge A box girder bridge, or box section bridge, is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises prestressed concrete, structural steel, or a composite of steel and reinf ...

in central

Stockholm Stockholm () is the Capital city, capital and List of urban areas in Sweden by population, largest city of Sweden as well as the List of urban areas in the Nordic countries, largest urban area in Scandinavia. Approximately 980,000 people liv ...

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

. Stretching over Oxhålssundet, it connects

Stora Essingen Stora Essingen is an island and a district in the Kungsholmen borough in Stockholm, Sweden. It is located adjacent to Lilla Essingen on Lake Mälaren. Both Essingen Islands are mainly residential areas. Stora Essingen is scattered with private ...

island to the western suburb

Bromma Bromma () is a borough (''stadsdelsområde'') in the western part of Stockholm, Sweden, forming part of the Stockholm Municipality. Bromma is primarily made up of Bromma Parish and Västerled Parish. The fourth largest airport in Sweden and the th ...

. Built 1996-1998 by the

Nordic Construction Company NCC AB is a Swedish construction company, the second largest in the Nordic region with annual revenues (2020) of 53,9 billion SEK and about 14 500 employees. NCC develops and builds residential and commercial properties, industrial facilitie ...

at a cost of 180 million SEK, it has served the

Tvärbanan Tvärbanan is a light-rail line in Stockholm, Sweden. Its name literally translates to ''The transverse line'', as it operates crosswise to the otherwise radial metro and commuter rail lines of Stockholm. It links together several transit li ...

light rail line and pedestrians and bicyclists since its inauguration in August 2000. The name is derived from

Alvik Alvik is a residential district in western Stockholm municipality and part of the Bromma borough. The Alvik outdoor Metro station in adjacent Traneberg was opened in 1952 and is also a connection to the Tvärbanan light railway and the Nockeby ...

, originally a local

manor house A manor house was historically the main residence of the lord of the manor. The house formed the administrative centre of a manor in the European feudal system; within its great hall were held the lord's manorial courts, communal meals w ...

built in 1819 and demolished in 1930. 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 An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaul ...

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 A brick is a type of block used to build walls, pavements and other elements in masonry construction. Properly, the term ''brick'' denotes a block composed of dried clay, but is now also used informally to denote other chemically cured cons ...

with a common concrete foundation. They are illuminated after dark. 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. Three years after the inauguration crack formations were discovered in the bridge. The

shear Shear may refer to: Textile production *Animal shearing, the collection of wool from various species **Sheep shearing *The removal of nap during wool cloth production Science and technology Engineering *Shear strength (soil), the shear strength ...

fissures in the

rib In vertebrate anatomy, ribs ( la, costae) are the long curved bones which form the rib cage, part of the axial skeleton. In most tetrapods, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the ches ...

s 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 Carbon fiber-reinforced polymers (American English), carbon-fibre-reinforced polymers (Commonwealth English), carbon-fiber-reinforced plastics, carbon-fiber reinforced-thermoplastic (CFRP, CRP, CFRTP), also known as carbon fiber, carbon compo ...

laminate Lamination is the technique/process of manufacturing a material in multiple layers, so that the composite material achieves improved strength, stability, sound insulation, appearance, or other properties from the use of the differing materials ...

s in sections with minor fissures, and tie struts in the worst affected sections.

References

External links

flickr - Photo of Alviksbron in winter
(January 2006) Bridges in Stockholm Bridges completed in 1998 Box girder bridges {{Sweden-bridge-struct-stub

See also

References

External links