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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 rail) without blocking the way 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, and 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 still in existence and use. Etymology The ''Oxford English Dictionary'' traces the origin of the wo ... [...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 features ... [...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 Kap ... [...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 upper Lake Zürich (''Obersee'') in Switzerland. The prehistoric timber piles discovered to the west of the Seedamm date back to 1523 BC. The island settlement ''Technikum'' is a prehistoric pile-dwelling (or stilt house) settlement which is part of the UNESCO World Heritage Site '' Prehistoric Pile dwellings around the Alps''. 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 wide wooden bridge. Between 1358 and 1360, Rudolf IV, Duke of Austria, built a 'new' wooden bridge across the lake that was used until 1878. On 6 April 2001, the reconstructed wooden footbridge was opened, being the longest wooden bridge in Switzerland. Geography The pedestrian bridge is located next to the so-called Seedamm, as of the today, on upper Lake Z ... [...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 a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stone Bridge (Skopje) 20180223
Stone Bridge may refer to: Bridges * Stone Bridge (Adana), across the Seyhan River in Adana, Turkey * Stone Bridge (Saint Petersburg), across Griboedov Canal in Saint Petersburg, Russia * Stone Bridge (Skopje), across the Vardar River in Skopje, Macedonia * Stone Bridge (Manassas), an American Civil War landmark in Manassas National Battlefield Park * Stone Bridge (Regensburg), across the Danube in Regensburg, Germany * Stone Bridge (Rhode Island), across the Sakonnet River in Rhode Island * Stone Bridge (Riga), across the Daugava in Riga, Latvia * Stone Bridge (Johnstown, Pennsylvania), historic railroad bridge across the Conemaugh River in Johnstown, Pennsylvania * Stone Bridge (Estonia) , former bridge in Tartu, Estonia Other uses * Stone Bridge Press, an American publishing company * Stone Bridge, Virginia, an unincorporated community in the United States * Stone Bridge High School Stone Bridge High School is a public secondary school in Ashburn, a community in Loud ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bosporus Bridge From Ortaköy 02
The Bosporus Strait (; grc, Βόσπορος ; tr, İstanbul Boğazı 'Istanbul strait', colloquially ''Boğaz'') or Bosphorus Strait is a natural strait and an internationally significant waterway located in Istanbul in northwestern Turkey. It forms part of the continental boundary between Asia and Europe, and divides Turkey by separating Anatolia from Thrace. It is the world's narrowest strait used for international navigation. Most of the shores of the Bosporus Strait, except for the area to the north, are heavily settled, with the city of Istanbul's metropolitan population of 17 million inhabitants extending inland from both banks. The Bosporus Strait and the Dardanelles Strait at the opposite end of the Sea of Marmara are together known as the Turkish Straits. Sections of the shore of the Bosporus in Istanbul have been reinforced with concrete or rubble and those sections of the Strait prone to deposition are periodically dredged. Name The name of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abutments
An abutment is the substructure at the ends of a bridge span or dam supporting its superstructure. Single-span bridges have abutments at each end which provide vertical and lateral support for the span, as well as acting as retaining walls to resist lateral movement of the earthen fill of the bridge approach. Multi-span bridges require 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 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, sewa ... term may also refer to the structure supporting one side of an arch, or masonry used to resist the lateral forces of a vault.Pevsner, N. (1970) ''Cornwall''; 2nd ed. Harmo ... [...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 on the Peloponnese, Greece. Dating to the Greek Bronze Age, it is one of the oldest arch bridges still in existence and use today and the oldest preserved bridge in Europe. The corbel arch bridge belonged in Mycenaean times to a highway between the two cities, which formed part of a wider military road network. It has a culvert span of ca. 1 m and is made in the typical Mycenaean manner of Cyclopean stones. The structure is long, wide at the base and high. The width of the roadway atop is about . The sophisticated layout of the bridge and the road indicate that they were specifically constructed for use by chariots.R. Hope Simpson (1998) Built in the late Late Helladic III Helladic chronology is a relative dating system used in archaeology and art history. It complements the Minoan chronology scheme devised by Sir Arthur Evans for the categorisation of Bronze Age artef ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hewn
In woodworking, hewing is the process of converting a 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 of the industrial-era type of sawmill A sawmill (saw mill, saw-mill) or lumber mill is a facility where logging, logs are cut into lumber. Modern sawmills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes ...s, it was a standard way of squaring up wooden 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, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marshes
A marsh is a wetland that is dominated by herbaceous rather than woody plant species.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p Marshes can often be found at the edges of lakes and streams, where they form a transition between the aquatic and terrestrial ecosystems. They are often dominated by grasses, rushes or reeds. If woody plants are present they tend to be low-growing shrubs, and the marsh is sometimes called a carr. This form of vegetation is what differentiates marshes from other types of wetland such as swamps, which are dominated by trees, and mires, which are wetlands that have accumulated deposits of acidic peat. Marshes provide habitats for many kinds of invertebrates, fish, amphibians, waterfowl and aquatic mammals. This biological productivity means that marshes contain 0.1% of global sequestered terrestrial carbon. Moreover, they have an outsized influence on climate re ... [...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 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 electronic document distribution, this has led to a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
