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Viaduct
A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road. Typically a viaduct connects two points of roughly equal elevation, allowing direct overpass across a wide valley, road, river, or other low-lying terrain features and obstacles. The term ''viaduct'' is derived from the Latin ''via'' meaning "road", and ''ducere'' meaning "to lead". It is a 19th-century derivation from an analogy with ancient Roman aqueducts. Like the Roman aqueducts, many early viaducts comprised a series of arches of roughly equal length. Over land The longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France. At its longest point, it measured 2,679 meters with a width of 22 meters. Viaducts are commonly used in many cities that are railroad hubs, such as Chicago, Birmingham, London and Manchester. These viaducts cross the large railroad yards that are needed for freigh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laigh Milton Viaduct
Laigh Milton Viaduct is a railway viaduct near Laigh Milton mill to the west of Gatehead, Ayrshire, Gatehead in East Ayrshire, Scotland, about west of Kilmarnock. It is probably the world's earliest surviving railway viaduct on a public railway,Roland Paxton and Jim Shipway, ''Civil Engineering Heritage: Scotland Lowlands and Borders'', Thomas Telford Publishing, London, 2007, . and the earliest known survivor of a type of multi-span railway structure subsequently adopted universally. The viaduct was restored in 1995–1996Sou' West the G&SWR Newsletter, P.5 and is a Category A listed structure since 1982. It bridges the River Irvine which forms the boundary between East Ayrshire and South Ayrshire. It was built for the Kilmarnock and Troon Railway, opened in 1812; the line was a horse drawn plateway (although locomotive traction was tried later). The first viaduct was closed in 1846 when the railway line was realigned to ease the sharp curve for locomotive operation, and a woo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viaduct Near Slade, Plymouth - Nicholas Matthew Condy - 60 1937 1
A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road. Typically a viaduct connects two points of roughly equal elevation, allowing direct overpass across a wide valley, road, river, or other low-lying terrain features and obstacles. The term ''viaduct'' is derived from the Latin ''via'' meaning "road", and ''ducere'' meaning "to lead". It is a 19th-century derivation from an analogy with ancient Roman aqueducts. Like the Roman aqueducts, many early viaducts comprised a series of arches of roughly equal length. Over land The longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France. At its longest point, it measured 2,679 meters with a width of 22 meters. Viaducts are commonly used in many cities that are railroad hubs, such as Chicago, Birmingham, London and Manchester. These viaducts cross the large railroad yards that are needed for freight ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trestle Bridge
A trestle bridge is a bridge composed of a number of short spans supported by closely spaced frames usually carrying a railroad line. A trestle (sometimes tressel) is a rigid frame used as a support, historically a tripod used to support a stool or a pair of isosceles triangles joined at their apices by a plank or beam such as the support structure for a trestle table. Each supporting frame is a bent. A trestle differs from a viaduct in that viaducts have towers that support much longer spans and typically have a higher elevation. Timber and iron trestles (i.e. bridges) were extensively used in the 19th century, the former making up from 1 to 3 percent of the total length of the average railroad. In the 21st century, steel and sometimes concrete trestles are commonly used to bridge particularly deep valleys, while timber trestles remain common in certain areas. Many timber trestles were built in the 19th and early 20th centuries with the expectation that they would be te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prince Edward Viaduct
The Prince Edward Viaduct System, commonly referred to as the Bloor Viaduct, is the name of a truss arch bridge system in Toronto, Ontario, Canada, connecting Bloor Street East, on the west side of the system, with Danforth Avenue on the east. The system includes the Castle Frank Brook, Rosedale Valley phase (a smaller structure, referred to as the Rosedale Valley Bridge, carrying Bloor Street over the Rosedale, Toronto, Rosedale Ravine) and the Sherbourne Phase, an Embankment (transportation), embankment built to extend Bloor Street East to the Rosedale Ravine from Sherbourne Street, Toronto, Sherbourne Street. The Don Valley phase of the system, the most recognizable, spans the Don River (Ontario), Don River Valley, crossing over (from west to east) the Bayview Avenue Extension, the Don River, and the Don Valley Parkway. The roadway has five lanes (three eastbound and two westbound) with a bicycle lane in each direction. The Toronto subway, subway level connects Broadview station ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pier (bridge Structure)
The pier of a bridge is an intermediate support that holds the deck of the structure. It is a massive and permanent support, as opposed to the shoring, which is lighter and provides temporary support. History Until the advent of concrete and the use of cast iron and then steel, bridges were made of masonry. Roman bridges were sturdy, semicircular, and rested on thick piers, with a width equal to about half the span of the Vault (architecture), vault. It was only from 1750, with Jean-Rodolphe Perronet, that the thickness of the piers could be reduced. While it was considered an absolute rule to give them a thickness equal to one-fifth of the span, Perronet proposed and succeeded in having thicknesses equal to one-tenth of the span and rises varying between one-fifth and one-seventh accepted. These reductions significantly reduced the obstacle to water flow created by the structure. With a height of 92 meters, the piers of the Fades viaduct in France, inaugurated on 10 October 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Controlled-access Highway
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms include ''wikt:throughway, throughway'' or ''thruway'' and ''parkway''. Some of these may be limited-access highways, although this term can also refer to a class of highways with somewhat less isolation from other traffic. In countries following the Vienna Convention on Road Signs and Signals, Vienna convention, the motorway qualification implies that walking and parking are forbidden. A fully controlled-access highway provides an unhindered flow of traffic, with no traffic signals, Intersection (road), intersections or frontage, property access. They are free of any at-grade intersection, at-grade crossings with other roads, railways, or pedestrian paths, which are instead carried by overpasses and underpasses. Entrances and exits to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bridge
A bridge is a structure built to Span (engineering), span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the path underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the material used to make it, and the funds available to build it. The earliest bridges were likely made with fallen trees and stepping stones. The Neolithic people built boardwalk bridges across marshland. The Arkadiko Bridge, dating from the 13th century BC, in the Peloponnese is one of the oldest arch bridges in existence and use. Etymology The ''Oxford English Dictionary'' traces the origin of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pont Serme
The Pont Serme or Pons Selinus, later called the Pons Septimus, was a Roman bridge of the Via Domitia in the Aude department, commune of Coursan, Occitania southern France. The approximately 1500 m long viaduct crossed the wide marshes of the Aude River and the Etang de Capestang west of Béziers, surpassing in length even the Trajan's Bridge over the Danube. Today, few traces remain of the viaduct, other than its name, which has passed over to a nearby wine-estate called "Domaine de Pontserme " See also * List of Roman bridges * Roman architecture * Roman engineering The ancient Romans were famous for their advanced engineering accomplishments. Technology for bringing running water into cities was developed in the east, but transformed by the Romans into a technology inconceivable in Greece. The architecture ... Notes Sources * External links Pictures of the Marches of Capestang once crossed by the Pont SermeArchived frothe originalon 2007-09-29. {{DEF ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bloor Street
Bloor Street is an east–west arterial road in Toronto, Ontario, Canada. Bloor Street runs from the Prince Edward Viaduct, which spans the Don River (Ontario), Don River Valley, westward into Mississauga where it ends at Central Parkway. East of the viaduct, Danforth Avenue/Danforth Road, Danforth Avenue continues along the same Right-of-way (transportation), right-of-way. The street, approximately long, contains a significant cross-sample of Toronto's ethnic communities. It is also home to Toronto's famous shopping street, the Mink Mile. A portion of Line 2 Bloor–Danforth, Line 2 of the Bloor-Danforth subway line runs along Bloor from Kipling Avenue to the Don Valley Parkway, and then continues east along Danforth Avenue. History Originally surveyed as the first concession road north of the baseline (then Lot Street, now Queen Street), it was known by many names, including the Tollgate Road (as the first tollgate on Yonge north of Lot Street was constructed there in 1820) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prestressed Concrete
Prestressed concrete is a form of concrete used in construction. It is substantially prestressed (Compression (physics), compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. Post-tensioned concreted is "structural concrete in which internal stresses have been introduced to reduce potential tensile stresses in the concrete resulting from loads." It was patented by Eugène Freyssinet in 1928. This compression is produced by the Tension (physics), tensioning of high-strength ''tendons'' located within or adjacent to the concrete and is done to improve the performance of the concrete in service. Tendons may consist of single wires, multi-wire Wire rope, strands or threaded bars that are most commonly made from high-tensile steels, carbon fiber or aramid fiber. The essence of prestressed concrete is that once the initial compression has been applied, the resulting material has the characteristics of high-strength concre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Box Girder Bridge
A box girder bridge, or box section bridge, is a bridge in which the main beam (structure), beams comprise girders in the shape of a hollow box. The box girder normally comprises prestressed concrete, structural steel, or a composite material, composite of steel and reinforced concrete. The box is typically rectangle, rectangular or trapezoidal in cross section (geometry), cross-section. Box girder bridges are commonly used for highway overpass, flyovers and for modern elevated structures of light rail transport. Although the box girder bridge is normally a form of beam bridge, box girders may also be used on cable-stayed bridge, cable-stayed and other bridges. Development of steel box girders In 1919, Major (United Kingdom), Major Giffard Le Quesne Martel, Gifford Martel was appointed head of the Experimental Bridging Establishment at Christchurch, Hampshire, which researched the possibilities of using tanks for battlefield engineering purposes such as bridge-laying and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toronto Subway
The Toronto subway is a rapid transit system serving Toronto and the neighbouring city of Vaughan in Ontario, Canada, operated by the Toronto Transit Commission (TTC). The subway system is a rail network consisting of three heavy-capacity rail lines operating predominantly underground. three new lines are under construction: two light rail lines (one running mostly underground, the other running mostly at-grade) and one heavy rail line (running both underground and on elevated guideways). In 1954, the TTC opened Canada's first underground rail line, then known as the "Yonge subway", under Yonge Street between Union Station and Eglinton Avenue with 12 stations. As of 2024, the network encompasses 70 stations and of route. In , the system had a ridership of , or about per weekday as of , making it the busiest rapid transit system in Canada in terms of daily ridership. There are 60 stations under construction as part of three new lines, two light rail lines and one subway li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
