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Lezíria Bridge
The Lezíria Bridge ( pt, Ponte da Lezíria) is a box girder bridge flanked by viaducts and rangeviews that spans the Tagus river and the Sorraia River between Carregado and Benavente, north-east of Lisbon, capital of Portugal. It is the third-longest bridge in Europe (including viaducts) with a total length of 12 km. The main bridge spans 972 m over the Tagus and the Sorraia rivers. The span lengths are 95 m - 127 m - 133 m - 4 × 130 m - 95 m. The bridge was constructed in 21 months using the balanced cantilever method and opened to traffic in July 2007. Description The bridge carries six road lanes, with a speed limit of , the same as motorways. See also * 25 de Abril Bridge * Vasco da Gama Bridge * List of longest bridges * Megaproject A megaproject is an extremely large-scale investment project. According to the ''Oxford Handbook of Megaproject Management'', "Megaprojects are large-scale, complex ventures that typically cost $1 billion or more, take many years ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Longest Bridges
This is a list of the world's longest bridges that are more than in length sorted by their full length above land and water. The main span is the longest span without any ground support. '' Note: There is no standard way to measure the total length of a bridge. Some bridges are measured from the beginning of the entrance ramp to the end of the exit ramp. Some are measured from shoreline to shoreline. Yet others use the length of the total construction involved in building the bridge. Since there is no standard, no ranking of a bridge should be assumed because of its position in the list. Additionally, numbers are merely estimates and measures in U.S. customary units (feet) may be imprecise due to conversion rounding.'' Completed Under construction See also * List of spans * List of longest arch bridge spans ** List of longest masonry arch bridge spans * List of longest cantilever bridge spans * List of longest cable-stayed bridge spans * List of longest continuous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bridges Completed In 2007
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] |
Bridges In Portugal
This list of bridges in Portugal lists bridges of particular historical, scenic, architectural or engineering interest. Road and railway bridges, viaducts, aqueducts and footbridges are included. Historical and architectural interest bridges Major road and railway bridges This table presents the structures with spans greater than 100 meters (non-exhaustive list). {{row indexer, {, class="wikitable sortable" , - ! class="unsortable", ! scope=col , ! scope=col , Name ! scope=col , Span ! scope=col , Length ! scope=col width="115" , Type ! scope=col width="115" , Carries''Crosses'' ! scope=col , Opened ! scope=col , Location ! scope=col , District ! class="unsortable", Ref. , - , , , _row_count, , 25 de Abril Bridge, , {{convert, 1013, m, ft, abbr=on, , {{convert, 3173, m, ft, abbr=on, , {{Sort, S, Suspension bridge, Suspension2 levels steel truss deck, steel pylons2x100+483+1013+483+99, , {{center, A2 motorway (Portugal), A2 motorwayEuropean route E1IP7Linha do Sul''Tagus'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cable-stayed Bridges In Portugal
A cable-stayed bridge has one or more ''towers'' (or ''pylons''), from which cables support the bridge deck. A distinctive feature are the cables or stays, which run directly from the tower to the deck, normally forming a fan-like pattern or a series of parallel lines. This is in contrast to the modern suspension bridge, where the cables supporting the deck are suspended vertically from the main cable, anchored at both ends of the bridge and running between the towers. The cable-stayed bridge is optimal for spans longer than cantilever bridges and shorter than suspension bridges. This is the range within which cantilever bridges would rapidly grow heavier, and suspension bridge cabling would be more costly. Cable-stayed bridges were being designed and constructed by the late 16th century, and the form found wide use in the late 19th century. Early examples, including the Brooklyn Bridge, often combined features from both the cable-stayed and suspension designs. Cable-stayed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Megaproject
A megaproject is an extremely large-scale investment project. According to the ''Oxford Handbook of Megaproject Management'', "Megaprojects are large-scale, complex ventures that typically cost $1 billion or more, take many years to develop and build, involve multiple public and private stakeholders, are transformational, and impact millions of people". However, $1 billion is not a constraint in defining megaprojects; in some contexts a relative approach is needed, such as in developing countries, where a much smaller project (such as one with a $100 million budget) could constitute a megaproject. Therefore, a more general definition is "Megaprojects are temporary endeavours (i.e. projects) characterized by: large investment commitment, vast complexity (especially in organizational terms), and long-lasting impact on the economy, the environment, and society". Bent Flyvbjerg, a professor at the Saïd Business School of the University of Oxford says that globally, megaprojects mak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vasco Da Gama Bridge
The Vasco da Gama Bridge ( pt, Ponte Vasco da Gama; ) is a cable-stayed bridge flanked by viaducts that spans the Tagus River in Parque das Nações in Lisbon, the capital of Portugal. It is the second longest bridge in Europe, after the Crimean Bridge, the longest one in the European Union. It was built to alleviate the congestion on Lisbon's 25 de Abril Bridge, and eliminate the need for traffic between the country's northern and southern regions to pass through the capital city. Construction began in February 1995; the bridge was opened to traffic on 29 March 1998, just in time for Expo 98, the World's Fair that celebrated the 500th anniversary of the discovery by Vasco da Gama of the sea route from Europe to India. Along with the 25 de Abril Bridge, the Vasco da Gama is one of two bridges that span the Tagus River in Lisbon. Description The bridge carries six road lanes, with a speed limit of , the same as that on motorways, except on one section which is limited to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
25 De Abril Bridge
The 25 de Abril Bridge ( pt, Ponte 25 de Abril, 25th of April Bridge, ) is a suspension bridge connecting the city of Lisbon, capital of Portugal, to the municipality of Almada on the left (south) bank of the Tagus river. It has a total length of , making it the 46th longest suspension bridge in the world. From its inauguration on 6 August 1966 up to 1974, the bridge was named Salazar Bridge (), after Portuguese Prime Minister António de Oliveira Salazar, who ordered its construction. After the Carnation Revolution, which overthrew the remnants of Salazar's regime, the bridge was renamed for April 25, the date of the revolution. It is also commonly called the Tagus River Bridge (in Portuguese: ''Ponte sobre o Tejo'' = "bridge over the Tagus"). Later changes had to be made due to the rapid increase in population. In the 1990s, a fifth car lane was added, and in 1999, a lower deck, used as a railway track, which was planned since the beginning, was finally built. Today, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balanced Cantilever Method
In telecommunications and professional audio, a balanced line or balanced signal pair is a circuit consisting of two conductors of the same type, both of which have equal impedances along their lengths and equal impedances to ground and to other circuits. The chief advantage of the balanced line format is good rejection of common-mode noise and interference when fed to a differential device such as a transformer or differential amplifier.G. Ballou, ''Handbook for Sound Engineers'', Fifth Edition, Taylor & Francis, 2015, p. 1267–1268. As prevalent in sound recording and reproduction, balanced lines are referred to as balanced audio. Common forms of balanced line are twin-lead, used for radio frequency signals and twisted pair, used for lower frequencies. They are to be contrasted to unbalanced lines, such as coaxial cable, which is designed to have its return conductor connected to ground, or circuits whose return conductor actually is ground (see earth-return telegraph). Ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Europe
Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia and it is located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. Comprising the westernmost peninsulas of Eurasia, it shares the continental landmass of Afro-Eurasia with both Africa and Asia. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south and Asia to the east. Europe is commonly considered to be Boundaries between the continents of Earth#Asia and Europe, separated from Asia by the drainage divide, watershed of the Ural Mountains, the Ural (river), Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea and the waterways of the Turkish Straits. "Europe" (pp. 68–69); "Asia" (pp. 90–91): "A commonly accepted division between Asia and E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portugal
Portugal, officially the Portuguese Republic ( pt, República Portuguesa, links=yes ), is a country whose mainland is located on the Iberian Peninsula of Southwestern Europe, and whose territory also includes the Atlantic archipelagos of the Azores and Madeira. It features the westernmost point in continental Europe, and its Iberian portion is bordered to the west and south by the Atlantic Ocean and to the north and east by Spain, the sole country to have a land border with Portugal. Its two archipelagos form two autonomous regions with their own regional governments. Lisbon is the capital and largest city by population. Portugal is the oldest continuously existing nation state on the Iberian Peninsula and one of the oldest in Europe, its territory having been continuously settled, invaded and fought over since prehistoric times. It was inhabited by pre-Celtic and Celtic peoples who had contact with Phoenicians and Ancient Greek traders, it was ruled by the Ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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