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.
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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.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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 Since the end of the 19th century, stone viaducts have been replaced by those built of metal and reinforced concrete.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.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

viaduct

[′vī·ə‚dəkt]
(civil engineering)
A bridge structure supported on high towers with short masonry or reinforced concrete arched spans.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The 'pre-cast segment box' of viaduct has been set up on pier no.
A locomotive derailed off while on the viaduct in 1916 but amazingly the driver and fireman of the freight locomotive jumped clear and survived the nasty accident.
In Greater London, work on the electrification of the main line between Barking and Gospel Oaks is shortly to commence, while work on strengthening the viaducts on the North West Electrification programme at Middleton has now been completed.
The 106-tonne deck beams have now arrived on site at the Astmoor Bridgewater viaduct.
CEBU CITY -- Cebu City Mayor Michael Rama ordered the temporary closure of the tunnel and the South Coastal Road, the city's gateway to south of Cebu, on Wednesday morning after officials found a "gap" on the joints of the viaduct which connects the tunnel and the coastal road.
As the steep road wound down the hill towards Sandsend it would pass underneath an imposing railway viaduct, but no more.
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 third question is answered by the cities that have taken down their viaducts. By reconnecting the street grid, drivers have more options - and this results in a dispersal of traffic to the grid rather than a concentration on one corridor.
The Bidston Moss Viaduct has long been earmarked for major refurbishment and strengthening, which is now due to start in summer next year.
It is a delightful walk from Featherstone Castle to another of the trail's great sights - Lambley Viaduct, which carried the railway 32 metres above the Tyne.
Police were called to the scene, which is popular with dog walkers, and discovered the body in a field below the viaduct.