Alviksbron
Encyclopedia
Alviksbron 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. The name is derived from Alvik
, originally a local manor house
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
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.
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
fissures in the rib
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 laminate
s in sections with minor fissures, and tie struts in the worst affected sections.
Box girder bridge
A box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The box is typically rectangular or trapezoidal in cross-section...
in central Stockholm
Stockholm
Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...
, Sweden
Sweden
Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....
. Stretching over Oxhålssundet, it connects Stora Essingen
Stora Essingen
Stora Essingen is an island and a district in the Kungsholmen borough in Stockholm, Sweden. The Essingeleden motorway, part of European route E4, passes along a section of the eastern shore...
island to the western suburb Bromma. Built 1996-1998 by the Nordic Construction Company
Nordic Construction Company
NCC AB is a Swedish construction company, the second largest in the Nordic region with annual revenues of 49 billion Swedish krona and about 17,000 employees.-History:...
at a cost of 180 million SEK
Swedish krona
The krona has been the currency of Sweden since 1873. Both the ISO code "SEK" and currency sign "kr" are in common use; the former precedes or follows the value, the latter usually follows it, but especially in the past, it sometimes preceded the value...
, it has served the Tvärbanan
Tvärbanan
Tvärbanan is a light rail line in the suburbs of Stockholm, Sweden. Its name literally translated into English is Crossways line. It links together many bus and rail lines crossways through its connections with the southern and western subway branches of the Stockholm Metro and the Stockholm...
light rail
Light rail
Light rail or light rail transit is a form of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail and metro systems, but higher capacity and higher speed than traditional street-running tram systems...
line and pedestrians and bicyclists since its inauguration in August 2000. The name is derived from Alvik
Alvik
Alvik is a residential district in western Stockholm municipality and part of the Bromma borough.The Alvik outdoor Metro station was opened in 1952 and is also a connection to the Tvärbanan light railway....
, originally a local manor house
Manor house
A manor house is a country house that historically formed the administrative centre of a manor, the lowest unit of territorial organisation in the feudal system in Europe. The term is applied to country houses that belonged to the gentry and other grand stately homes...
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
Arch
An arch is a structure that spans a space and supports a load. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture and their systematic use started with the Ancient Romans who were the first to apply the technique to a wide range of structures.-Technical aspects:The...
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
Brick
A brick is a block of ceramic material used in masonry construction, usually laid using various kinds of mortar. It has been regarded as one of the longest lasting and strongest building materials used throughout history.-History:...
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
Shearing (physics)
Shearing in continuum mechanics refers to the occurrence of a shear strain, which is a deformation of a material substance in which parallel internal surfaces slide past one another. It is induced by a shear stress in the material...
fissures in the rib
Rib
In vertebrate anatomy, ribs are the long curved bones which form the rib cage. In most vertebrates, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the chest cavity. They serve to protect the lungs, heart, and other internal organs of the thorax...
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 laminate
Laminate
A laminate is a material that can be constructed by uniting two or more layers of material together. The process of creating a laminate is lamination, which in common parlance refers to the placing of something between layers of plastic and gluing them with heat and/or pressure, usually with an...
s in sections with minor fissures, and tie struts in the worst affected sections.
See also
- List of bridges in Stockholm
- SkansbronSkansbronSkansbron is a bascule bridge in central Stockholm, Sweden. Stretching over the canal Hammarbykanalen, it connects the major island Södermalm to the southern mainland district Södra Hammarbyhamnen....
- GröndalsbronGröndalsbronGröndalsbron are two bridges in central Stockholm, Sweden, connecting the island Stora Essingen to the southern mainland district Gröndal.The older bridge, inaugurated in 1967, forms a 460-metre section of the Essingeleden motorway, of which 260 metres constitute the bridge, divided into three...
- Fredriksdalsbron
External links
- flickr - Photo of Alviksbron in winter (January 2006)