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Bridges
A bridge is a structure built to 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 the word ''bri ... [...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 structural load, loads partially into a horizontal thrust restrained by the abutments at either side, and partially into a vertical load on the arch supports. 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 Greece, 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 Ancient Rome, Romans were – as with the Vault (architecture), vault and the dome – the first to fully realize the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
West Montrose Covered Bridge (Oct
West Montrose Covered Bridge, also known as the "Kissing Bridge", is a covered bridge in West Montrose, Ontario, within Waterloo Region, one of the oldest covered bridges in Canada. The bridge is the only remaining historic covered bridge in Ontario and the second oldest surviving bridge in the Region of Waterloo. (In 2015, the total number of surviving covered bridges in Canada was below 200.) John Bear, who had previously built barns, built the bridge in 1880–1881, mostly of oak and white pine. The total cost to the Township of Woolwich was $3,197.50. The structure can still be used by pedestrians, buggy traffic and vehicles weighing less than three tonnes for crossing the Grand River. Since 1998, it has been owned and maintained by the Regional Municipality of Waterloo. The bridge's original design was described as a "two-span hybrid Howe truss" or as a "hybrid Queen Post – Howe timber configuration" with two louvred windows. (Additional windows, visible today, were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timber Bridge
A timber bridge or wooden bridge is a bridge that uses timber or wood as its principal structural material. One of the first forms of bridge, those of timber have been used since ancient times. History The most ancient form of timber bridge is the log bridge, created by felling a tree over a gap needing to be crossed. Among the oldest timber bridges is the Holzbrücke Rapperswil-Hurden crossing upper Lake Zürich in Switzerland; the prehistoric timber piles discovered to the west of the Seedamm date back to 1523 B.C. The first wooden footbridge led across Lake Zürich, followed by several reconstructions at least until the late 2nd century AD, when the Roman Empire built a wooden bridge. Between 1358 and 1360, Rudolf IV, Duke of Austria, built a 'new' wooden bridge across the lake that was used until 1878 – measuring approximately in length and wide. On April 6, 2001, the reconstructed wooden footbridge was opened, being the longest wooden bridge in Switzerland. The Kapell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holzbrücke Rapperswil-Hurden
Holzbrücke Rapperswil-Hurden is a wooden pedestrian bridge between the city of Rapperswil and the village of Hurden crossing the Obersee (the upper part of Lake Zurich) in Switzerland. On 6 April 2001, the footbridge was opened. With a length of it is the longest wooden bridge in Switzerland. The wooden bridge has many predecessors. Wooden structures enabling lake crossings in the same area were already built thousands of years ago. Geography The pedestrian bridge is located next to the so-called Seedamm, a stone and metal structure which includes two bridges. Like the Seedamm it connects Rapperswil in the canton of St. Gallen and Hurden in the canton of Schwyz. The water area between Rapperswil and Hurden is the narrowest and shallowest part of Lake Zurich. While the Seedamm separates the Obersee part from the main part of Lake Zurich, the pedestrian bridge crosses the Obersee. Earlier wooden bridges Neolithic and Bronze Age The oldest remains of bridges or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abutments
An abutment is the Bridge#Structure types, substructure at the ends of a bridge Span (architecture), span or dam supporting its Bridge#Structure types, superstructure. Single-span bridges have abutments at each end that provide vertical and lateral support for the span, as well as acting as retaining walls to resist lateral movement of the earthen cut and fill, fill of the bridge approach. Multi-span bridges require pier (architecture), piers to support ends of spans unsupported by abutments. Dam abutments are generally the sides of a valley or gorge, but may be artificial in order to support arch dams such as Kurobe Dam in Japan. The civil engineering term may also refer to the structure supporting one side of an arch, or masonry used to resist the lateral forces of a vault (architecture), vault.Pevsner, N. (1970) ''Cornwall''; 2nd ed. Harmondsworth: Penguin; p. 245 The impost (architecture), impost or abacus (architecture), abacus of a column in classical architecture may al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arkadiko Bridge
The Arkadiko Bridge or Kazarma Bridge is a Mycenaean bridge near the modern road from Tiryns to Epidauros in Argolis on the Peloponnese, Greece. The stone crossing, which is dated to the Greek Bronze Age, is one of the oldest crossable arch bridges still in existence. It is the oldest preserved bridge in Europe. The corbel arch bridge was constructed during the Mycenaean Period in a typical Cyclopean style contemporary to the Late Helladic period (III) (ca. 1300–1190 BC). The bridge, which is long, wide at the base and high, spans a culvert. The width of the roadway is about . Arkadiko Bridge was part of a military highway between the two cities of Tiryns to Epidauros which formed part of a wider Hellenic road network. The sophisticated layout of the bridge and the alignment of the road indicate that the bridge could be used by chariots. Three thousand years later, the bridge remains in local use. __NOTOC__ Other Mycenaean bridges in Argolis The Arkadiko Bridge is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Log Bridge
A log bridge is a timber bridge that uses logs that fall naturally or are intentionally felled or placed across streams. The first man-made bridges with significant span were probably intentionally felled trees. The use of emplaced logs is now sometimes used in temporary bridges used for logging roads, where a forest tract is to be harvested and the road then abandoned. Such log bridges have a severely limited lifetime due to soil contact and subsequent rot and wood-eating insect infestation. Longer lasting log bridges may be constructed by using treated logs and/or by providing well drained footings National Parks Conference 1915, p. 59. "If we can design the abutment so that no moisture can collect under the logs the life of the bridge is materially increased." of stone or concrete combined with regular maintenance to prevent soil infiltration. This care in construction can be seen in the French bridge illustrated below, which has well locked dry set stone abutments and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Government Publishing Office
The United States Government Publishing Office (USGPO or GPO), formerly the United States Government Printing Office, is an agency of the legislative branch of the United States federal government. The office produces and distributes information products and services for all three branches of the Federal Government, including U.S. passports for the Department of State as well as the official publications of the Supreme Court, the Congress, the Executive Office of the President, executive departments, and independent agencies. An act of Congress changed the office's name to its current form in 2014. History Establishment of the Government Printing Office The Government Printing Office was created by congressional joint resolution () on June 23, 1860. It began operations March 4, 1861, with 350 employees and reached a peak employment of 8,500 in 1972. The agency began transformation to computer technology in the 1980s; along with the gradual replacement of paper with el ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Post Track
The Post Track is an ancient causeway in the valley of the River Brue on the Somerset Levels, England. It dates from around 3838 BCE, making it some 30 years older than the Sweet Track in the same area. Various sections have been scheduled as ancient monuments. The timber trackway was constructed of long ash planks, with lime and hazel posts spaced along three-metre intervals. According to Coles, the heavy planks of the Post Track were rarely pegged. The track follows closely in line with the Sweet Track and, before the planks were dated, it was posited that it served as a construction platform for the Sweet Track. It is speculated that it led to places of spiritual significance. It is likely that the route was intended to be a permanent fixture, with the track being updated, maintained, and eventually replaced as it succumbed to the elements. Some of the wood planks were also reused in the Sweet Track when it was built, making the specific dating more complex. Refer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Current Archaeology
''Current Archaeology'' is a British monthly archaeology magazine. Summary ''Current Archaeology'' describes itself as the "United Kingdom's best selling archaeology magazine", a claim substantiated by British Archaeological Jobs and Resources online, which labels the title "Britain's favourite archaeology magazine". It was founded in 1967 by Andrew Selkirk, a Society of Antiquaries of London, Fellow of the Society of Antiquaries, and the present editor-in-chief. Issue 1 was mailed free of charge to university academics and archaeologists, with invitations to become subscribers from Issue 2. The magazine now has more than 14,000 subscribers worldwide. From 1967 to 2007 the magazine was bi-monthly, becoming monthly in November 2007. Rob Selkirk is publisher of the magazine, through Current Publishing (UK), Current Publishing. The magazine covers all periods of British archaeology, from prehistory to the present day. It also publishes an annual ''Archaeology Handbook'', which aims ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temporary Wooden Footbridge Leading To The City Of Luang Prabang
Temporary or Temporaries may refer to: *''Temporaries'', also titled ''Richelieu'', a 2023 Canadian drama film directed by Pier-Philippe Chevigny *''Temporary'', a TV series created by Cyrina Fiallo and Chrissie Fit in 2017 *Temporary (song), "Temporary" (song), a song by Eminem from the 2024 album ''The Death of Slim Shady'' *Temporary (album), ''Temporary'' (album), a 2025 studio album by Everything Is Recorded See also *Temp (other), short for "temporary" {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hewn
In woodworking, hewing is the process of converting a trunk (botany), log from its rounded natural form into lumber (timber) with more or less flat surfaces using primarily an axe. It is an ancient method, and before the advent the sawmills, it was a standard way of squaring up wooden beam (structure), beams for timber framing. Today it is still used occasionally for that purpose by anyone who has logs, needs beams, and cannot or would prefer not to pay for finished lumber. Thus, homesteading, homesteaders on frugal budgets, for example, may hew their own lumber rather than buy it. Definitions ''Hew'' is a general term meaning to strike or blow with a tool such as an axe or sword; to chop or gash, and is used in warfare, stone and woodcutting, and coal and salt mining in this sense. Hewing wood is to shape the wood with a sharp instrument such as an axe, specifically flattening one or more sides of a log. Methods As an ancient method of timber ''conversion'', different method ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
