viaduct


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viaduct

(vī`ədŭkt') [Lat.,=road conveyor], type of bridge for carrying a highway or railroad over a valley, over low ground, or over a road. It is commonly constructed in the form of several towers or piers that support arches on which the roadway rests. Viaducts are usually constructed of steel or concrete; in the past they were built of wood or stone. Examples of viaducts include the Pulaski Skyway in NE New Jersey and the Colorado Street Bridge in Pasadena, Calif. The world's longest viaduct, the Danyang-Kunshan Grand Bridge (102.4 mi/164.8 km), is part of the Nanjing to Shanghai section of the Beijing–Shanghai High-Speed Railway in China.

Viaduct

An elevated structure supported on a series of arches, piers, or trestles that carries a roadway or railway over a valley or other depression.

Viaduct

 

a bridgelike structure, usually of great length and built on high supporting piers; used when a road crosses ravines, gorges, swampy river valleys, and so on.

Viaducts are sometimes built instead of high embankments if the construction of the latter is economically unfeasible or technically inadvisable—for example, as a result of weakness in the foundation soil. A gradual increase in the height of the piers (and, in certain types of viaducts, also in the size of the spans at the highest point) distinguishes the viaduct from the trestle bridge, which usually has a negligible change in the height of its piers and spans of identical size. Viaducts are built of stone, metal, concrete, or reinforced concrete; for the most part they are of multispan arch design, less frequently of beam construction.

Viaducts were well known even in ancient Rome, where they were built in a system of arches made up of large stone blocks; this gave the viaducts an appearance of austere power, characteristic of the utilitarian Roman structures. Since the end of the 19th century, stone viaducts have been replaced by those built of metal and reinforced concrete. The construction possibilities of these materials and the development of a scientific theory of bridge building have made possible a considerable decrease in the volume and weight of the structure’s main components and have had an effect on the construction of modern viaducts, in which the architectural image is based on the emotional expressiveness of plastically conceived exposed structures that are subordinate to engineering principles (for example, a reinforced-concrete viaduct in Nogent-sur-Marne, France; and the Polcévera Viaduct in Genoa, 1961, engineer R. Morandi).

REFERENCE

Nadezhdin, B. M. Mosty i puteprovody v gorodakh. Moscow, 1964.

viaduct

[′vī·ə‚dəkt]
(civil engineering)
A bridge structure supported on high towers with short masonry or reinforced concrete arched spans.
References in periodicals archive ?
The viaduct's design is complex because it is being constructed on a sloping riverbank, most of which is submerged when the river runs high.
The main defects observed in prestressed concrete viaducts are the following: leakage in expansion joints over mobile and fixed hinges, a rough, rolling and deteriorated pavement of a carriageway, leakage in expansion joints of footpaths, the lack of or inadequate viaduct drainage system, inadequate (leaky) waterproofing on the top of deck beams, inadequate erection of segment joints resulting in leakage (Fig.
"The 85-metre (280ft), 3,500-tonne bridge will be taken down piece by piece due to the close proximity of the new bridge to the south of the original, and also to ensure that we don't damage the M1 carriageway which runs directly below the viaduct."
"The improvements we are making will allow the viaduct to operate at its full capacity, allowing vehicles over 3.5 tonnes back onto all parts of the viaduct.
The viaduct is incredibly slender, the design an elegant combination of a brilliant engineering concept by Michel Virlogeux (the engineer who designed the amazing Pont de Normandie across the Seine at Le Havre) and inspired design by Foster and Partners, aided by a number of European engineering groups.
If the road surface of the Millau Viaduct was its highest point, how tall would the Millau Viaduct be?
The viaduct carried trains for 120 years between 1852 and 1972, when the line was closed.
A spokesman said: "Just before 2.30pm yesterday, Sunday 6th May, police were contacted by passing motorists regarding concerns for a man seen on the A19 southbound at Leven Viaduct.
He told a town hall committee meeting: "Stockport Viaduct is an iconic structure that we all see.
The man may not live locally as the viaduct is know to be a popular spot for cyclists, as it is situated on the coast to coast cycle path.
A fire that ravaged a community of informal settlers in Muntinlupa Wednesday morning caused a tower of the National Power Corporation (NPC) to lean towards the Alabang flyover and forced the temporary closing to traffic of the viaduct.
MONTHS of work to renovate a railway viaduct which carries a popular tourist line will get under way next year, Network Rail has confirmed.