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Inverted Arch
An inverted arch or invert is a civil engineering structure in the form of an inverted arch, inverted in comparison to the usual arch bridge. Like the flying arch, the inverted arch is not used to support a load, as for a bridge, but rather to resist sideways, inwards loads. The conventional arch supports a vertical load downwards on the centre of the arch and translates this into forces both downwards and outwards at the base of the arch. In most cases, this sideways force is a nuisance and must be resisted by either strong foundations or a further 'bowstring' girder, in the form of a tied-arch bridge. Inverted arches are used where sideways forces must be restrained, and where space is most easily available ''beneath'' a construction. They have often been applied to railway cuttings, but are perhaps most distinctively used as the base of docks, particularly graving dock, dry docks and lock (water transport), locks that must be supported even when they are empty of water that could ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Civil Engineering
Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads, bridges, canals, dams, airports, sewage systems, pipelines, structural components of buildings, and railways. Civil engineering is traditionally broken into a number of sub-disciplines. It is considered the second-oldest engineering discipline after military engineering, and it is defined to distinguish non-military engineering from military engineering. Civil engineering can take place in the public sector from municipal public works departments through to federal government agencies, and in the private sector from locally based firms to global Fortune 500 companies. History Civil engineering as a discipline Civil engineering is the application of physical and scientific principles for solving the problems of society, and its history is intricately linked to advances in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 vaults, but a vault may be distinguished as a continuous arch forming a roof. 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. Basic concepts An arch is a pure compression form. It can span a large area by resolving forces into compressive stresses, and thereby eliminating tensile stresses. This is sometimes denominated "arch action". As the forces in the arch are transferred to its base, the arch pushes outward at its base, denominated "thrust". As the rise, i. e. height, of the arch decreases the outward thrust increases. In order to preserve arch action and prevent collapse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arch Bridge
An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side. A viaduct (a long bridge) may be made from a series of arches, although other more economical structures are typically used today. History Possibly the oldest existing arch bridge is the Mycenaean Arkadiko Bridge in Greece from about 1300 BC. The stone corbel arch bridge is still used by the local populace. The well-preserved Hellenistic Eleutherna Bridge has a triangular corbel arch. The 4th century BC Rhodes Footbridge rests on an early voussoir arch. Although true arches were already known by the Etruscans and ancient Greeks, the Romans were – as with the vault and the dome – the first to fully realize the potential of arches for bridge construction. A list of Roman bridges compiled by the engineer Colin O'Connor featur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flying Arch
A flying arch is a form of arch bridge that does not carry any vertical load, but is provided solely to supply outward horizontal forces, to resist an inwards compression. They are used across cutting (transportation), cuttings, to avoid them collapsing inwards. Operation The conventional arch supports a vertical load downwards on the centre of the arch and translates this into forces both downwards and outwards at the base of the arch. In most cases, this sideways force is a nuisance and must be resisted by either strong foundations or a further 'bowstring' girder, in the form of a tied-arch bridge. In some cases though, originally for railway cuttings in loose rock, the sides of the cutting are unable to retain their own weight and tend to slide inwards. Flying arches may be provided to retain these side walls. Unlike the conventional arch, the vertical load on the arch does not carry a useful load, it is merely used to generate the side-thrust, which in this case is useful for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tied-arch Bridge
A tied-arch bridge is an arch bridge in which the outward horizontal forces of the arch(es) caused by tension at the arch ends to a foundation are countered by equal tension of its own gravity plus any element of the total deck structure such great arch(es) support. The arch(es) have strengthened chord(s) that run to a strong part of the deck structure or to independent tie-rods below the arch ends. Description Thrusts downwards on a tied-arch bridge deck are translated, as tension, by vertical ties between the deck and the arch, tending to flatten it and thereby to push its tips outward into the abutments, like for other arch bridges. However, in a tied-arch or bowstring bridge, these movements are restrained not by the abutments but by the strengthened chord, which ties these tips together, taking the thrusts as tension, rather like the string of a bow that is being flattened. Therefore, the design is also called a bowstring-arch or bowstring-girder bridge. The elimination o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Cutting
Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in Track (rail transport), tracks. In contrast to road transport, where the vehicles run on a prepared flat surface, rail vehicles (rolling stock) are directionally guided by the tracks on which they run. Tracks usually consist of steel rails, installed on Railroad tie, sleepers (ties) set in track ballast, ballast, on which the rolling stock, usually fitted with metal wheels, moves. Other variations are also possible, such as "slab track", in which the rails are fastened to a concrete foundation resting on a prepared subsurface. Rolling stock in a rail transport system generally encounters lower friction, frictional resistance than rubber-tyred road vehicles, so passenger and freight cars (carriages and wagons) can be coupled into longer trains. The rail transport operations, operation is carried out by a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graving Dock
A dry dock (sometimes drydock or dry-dock) is a narrow basin or vessel that can be flooded to allow a load to be floated in, then drained to allow that load to come to rest on a dry platform. Dry docks are used for the construction, maintenance, and repair of ships, boats, and other watercraft. History Greco-Roman world The Greek author Athenaeus of Naucratis (V 204c-d) reports something that may have been a dry dock in Ptolemaic Egypt in the reign of Ptolemy IV Philopator (221-204 BC) on the occasion of the launch of the enormous ''Tessarakonteres'' rowing ship. It has been calculated that a dock for a vessel of such a size might have had a volume of 750,000 gallons of water. In Roman times, a shipyard at Narni, which is still studied, may have served as a dry dock. Medieval China The use of dry docks in China goes at least as far back the 10th century A.D. In 1088, Song Dynasty scientist and statesman Shen Kuo (1031–1095) wrote in his ''Dream Pool Essays'': Renaissa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lock (water Transport)
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls. Locks are used to make a river more easily navigable, or to allow a canal to cross land that is not level. Later canals used more and larger locks to allow a more direct route to be taken. Pound lock A ''pound lock'' is most commonly used on canals and rivers today. A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. Pound locks were first used in China during the Song Dynasty (960–1279 AD), having been pioneered by the Song politician and naval en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canal Tunnel
{{Refimprove, date=September 2009 A canal tunnel is a tunnel for a canal. The building of a canal tunnel is crucial to help a waterway that is normally used for shipping cross a difficult section of terrain. They are also constructed to reduce the dependency on canal locks. The longest canal tunnel in the world is the Rove Tunnel in France, currently disused. Other notable examples of canal tunnels include the proposed Stad Ship Tunnel in Norway, a proposed tunnel for sea going vessels, Standedge Tunnel, the longest, deepest and highest in the United Kingdom and Harecastle Tunnel, another noteworthy tunnel in the UK. The oldest canal tunnel in the world is the Malpas Tunnel also in France, built in 1679. In some canal tunnels the towpath continues through the tunnel. In other cases, especially on English narrow canals, there is no towpath. The horse would be led over the hill and the boat would be propelled by legging. The term "canal tunnel" is not commonly applied to tunnel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newbold-on-Avon
Newbold-on-Avon (usually shortened to just Newbold) is a suburb of Rugby in Warwickshire, England, located around 1½ miles north-west of the town centre, it is adjacent to the River Avon from which the suffix is derived. Newbold was historically a village in its own right, but was incorporated into Rugby in 1932. The name is derived from the Saxon ''Niowebold'' ('New house'). The ancient parish of Newbold-on-Avon contained the nearby settlements of Harborough Parva, Cosford, Long Lawford and Little Lawford. The latter three became separate civil parishes in the 19th century, while Harborough Parva was transferred to Harborough Magna parish in 1931. In 1931 the parish had a population of 696. On 1 April 1932 the parish was abolished and merged with Rugby and Harborough Magna. The older part of the village of Newbold sits on a hill north of the River Avon on the B4112 road, and contains some old buildings, including some red brick 18th-century houses and some timber-framed bui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hownes Gill Viaduct
The Hownsgill Viaduct (in some sources called Hownes Gill Viaduct and locally called the Gill bridge) is a former railway bridge located west of Consett in County Durham, England. It is currently used as a footpath and cycleway. Background From July 1832 to May 1834, Robert Stephenson was consulting engineer to the industrial Stanhope and Tyne Railway (S&TR), built to transport limestone from Stanhope to Consett, and then with coal onwards to Tyne Dock in South Shields. However, the company was unable to afford a bridge over the deep and wide dry valley, Hown's Gill. The company hence authorised Stephenson to construct two steep rope-worked inclines, one at 1:2.5 and a second at 1:3. To enable wagons to be transported from to and onwards to , single wagons were carried sideways in cradles worked by a single stationary steam engine located at the bottom of the gorge. On 15 May 1834, the first section from Stanhope to Annfield opened. After the S&TR sold its assets in 1842, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robert Stephenson
Robert Stephenson Fellow of the Royal Society, FRS HFRSE FRSA Doctor of Civil Law, DCL (16 October 1803 – 12 October 1859) was an English civil engineer and designer of locomotives. The only son of George Stephenson, the "Father of Railways", he built on the achievements of his father. Robert has been called the greatest engineer of the 19th century. Life Robert was born in Willington Quay near Wallsend, Northumberland, the son of George Stephenson and his wife, Frances Henderson. The family moved to Killingworth, where Robert was taught at the local village school. Robert attended the middle-class Percy Street Academy in Newcastle and at the age of fifteen was apprenticed to the mining engineer Nicholas Wood. He left before he had completed his three years to help his father survey the Stockton and Darlington Railway. Robert spent six months at Edinburgh University before working for three years as a mining engineer in Colombia. When he returned his father was building t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_-_dry_dock_Pearl_Harbor_(1).jpg "Click for more on -> Graving Dock")
