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Tunnel Construction
Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management. Tunnel construction is a subset of underground construction. There are three basic types of tunnel construction in common use: * Cut-and-cover tunnel, constructed in a shallow trench and then covered over. * Bored tunnel, constructed in situ, without removing the ground above. They are usually of circular or horseshoe cross-section. Some concepts of underground mining apply. Modern techniques include Shotcrete used in the New Austrian tunnelling method, use of a tunnel boring machine (TBM) or tunnelling shield. But still tunnels are constructed which are secured with pit props and shoring and then are steine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
München Marienplatz Tunnelerweiterung
Munich ( ; german: München ; bar, Minga ) is the capital and most populous city of the German state of Bavaria. With a population of 1,558,395 inhabitants as of 31 July 2020, it is the third-largest city in Germany, after Berlin and Hamburg, and thus the largest which does not constitute its own state, as well as the 11th-largest city in the European Union. The city's metropolitan region is home to 6 million people. Straddling the banks of the River Isar (a tributary of the Danube) north of the Bavarian Alps, Munich is the seat of the Bavarian administrative region of Upper Bavaria, while being the most densely populated municipality in Germany (4,500 people per km2). Munich is the second-largest city in the Bavarian dialect area, after the Austrian capital of Vienna. The city was first mentioned in 1158. Catholic Munich strongly resisted the Reformation and was a political point of divergence during the resulting Thirty Years' War, but remained physically un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rapid Transit
Rapid transit or mass rapid transit (MRT), also known as heavy rail or metro, is a type of high-capacity public transport generally found in urban areas. A rapid transit system that primarily or traditionally runs below the surface may be called a subway, tube, or underground. Unlike buses or trams, rapid transit systems are railways (usually electric railway, electric) that operate on an exclusive right-of-way (transportation), right-of-way, which cannot be accessed by pedestrians or other vehicles, and which is often grade-separated in tunnels or on elevated railways. Modern services on rapid transit systems are provided on designated lines between rapid transit station, stations typically using electric multiple units on rail tracks, although some systems use guided rubber tires, magnetic levitation (''maglev''), or monorail. The stations typically have high platforms, without steps inside the trains, requiring custom-made trains in order to minimize gaps between train a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HSL-Zuid
The HSL-Zuid ( nl, Hogesnelheidslijn Zuid, en, High-speed Line South), is a 125 kilometre-long (78 miles) Dutch high-speed railway line running between the Amsterdam metropolitan area and the Belgian border, with a branch to Breda, North Brabant. Together with the Belgian HSL 4 it forms the Schiphol–Antwerp high-speed railway. Originally scheduled to be in service by 2007, the first public operations began on 7 September 2009, after a ceremony on 6 September. Intercity Direct operates between Amsterdam and Breda, for the time being with conventional Intercity carriages and TRAXX locomotives. On 13 December 2009 Thalys began services from Amsterdam to Paris and Brussels on the HSL-Zuid. On 4 April 2018 the first scheduled Eurostar connected Amsterdam to London via the HSL-Zuid. Talks about a high-speed line between Amsterdam and the Belgian border started under Prime Minister Joop den Uyl (1973–1977); work began during Wim Kok's first term (1998–2002). The Rijkswate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Switzerland
). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel, St. Gallen a.o.). , coordinates = , largest_city = Zürich , official_languages = , englishmotto = "One for all, all for one" , religion_year = 2020 , religion_ref = , religion = , demonym = , german: Schweizer/Schweizerin, french: Suisse/Suissesse, it, svizzero/svizzera or , rm, Svizzer/Svizra , government_type = Federalism, Federal assembly-independent Directorial system, directorial republic with elements of a direct democracy , leader_title1 = Federal Council (Switzerland), Federal Council , leader_name1 = , leader_title2 = , leader_name2 = Walter Thurnherr , legislature = Fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gotthard Base Tunnel
, rm, Tunnel da basa dal Sogn Gottard , image = 20141120 gotthard-basistunnel02-wikipedia-hannes-ortlieb.jpg , image_size = 250 , caption = Turnout at Faido multifunction station , line = Gotthard Line , location = Switzerland (Uri, Grisons and Ticino) , coordinates = , system = Swiss Federal Railways (SBB CFF FFS) , status = Active since 11 December 2016 , crosses = Alps (western Glarus Alps and central Lepontine Alps at the eastern Gotthard Massif) , start = Erstfeld, canton of Uri (north, ) , end = Bodio, canton of Ticino (south, ) , stations = , startwork = 4 November 1999 , opened = 1 June 2016 , closed = , owner = SBB Infrastructure , operator = SBB CFF FFS , traffic = Railway , character = Passenger and freight , length = , linelength = , tracklength = , notrack = 2 single-track tubes , gauge = (standard gauge) , el = 15 kV 16.7 Hz , speed = , hielevation = , lowelevation = (south portal) , height = from top of rail to overhead conductor , ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canton Of Glarus
The canton of Glarus (german: Kanton Glarus rm, Chantun Glaruna; french: Canton de Glaris; it, Canton Glarona) is a canton in east central Switzerland. The capital is Glarus. The population speaks a variety of Alemannic German. The majority of the population (81%) identifies as Christian, about evenly split between Protestants and Catholics. History According to legend, the inhabitants of the Linth Valley were converted to Christianity in the 6th century by the Irish monk Saint Fridolin, the founder of Säckingen Abbey in what is now the German state of Baden-Württemberg. From the 9th century, the area around Glarus was owned by Säckingen Abbey, the town of Glarus being recorded as ''Clarona''. The Alemanni began to settle in the valley from the early 8th century. The Alemannic German language took hold only gradually, and was dominant by the 11th century. By 1288, the Habsburgs had claimed all the abbey's rights. Glarus joined the Old Swiss Confederacy in 1352 as one of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linthal, Glarus
Linthal is a village, and former municipality, in the municipality of Glarus Süd and canton of Glarus in Switzerland. The village lies near the head of the valley of the Linth river, and at the foot of the Klausen Pass into the canton of Uri. It is the terminus of the railway line that traverses the length of Glarus. History Linthal is first mentioned in 1289 as ''Lintal''. In 1879, Linthal was connected to the Swiss railway network by the opening of the Swiss Northeastern Railway line from Weesen. The road over the Klausen Pass was built between 1895 and 1900. Construction of the Linth–Limmern hydro-electric power scheme, in the mountains above Linthal, commenced in 1957, and was fully operational by 1968. In 2011, the municipality of Linthal was merged into the new municipality of Glarus Süd. Geography The village Linthal lies at the head of the valley of the Linth river, at an altitude of approximately . It is surrounded by mountains, including Ortstock (), Clariden ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linth–Limmern Power Stations
The Linth–Limmern Power Stations are a system of hydroelectric power stations located south of Linthal in the canton of Glarus, Switzerland. The system uses five reservoirs and four power stations at steep variations in altitude. Works on the complex began in 1957 with the construction of Lake Limmern Dam and the Mutt, Tierfehd and Linthal Power Stations. The dam was complete in 1963 and the power stations were all operational by 1968, with an installed capacity of 340 MW. In 2009, a 140 MW pumped-storage component between Lake Limmern and Tierfehd Reservoir was commissioned. In 2010, construction began on the Linthal 2015 Project, which included the expansion of Lake Mutt and Tierfehd Reservoir, and the addition of the Limmern Power Station, a 1,000 MW pumped-storage component between Lake Mutt and Lake Limmern. Commissioning of the last unit in Limmern was completed by December 2017, bringing the total installed capacity of the system to 1480 MW. Design and operation The high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Underwater Diving
Underwater diving, as a human activity, is the practice of descending below the water's surface to interact with the environment. It is also often referred to as diving, an ambiguous term with several possible meanings, depending on context. Immersion in water and exposure to high ambient pressure have physiological effects that limit the depths and duration possible in ambient pressure diving. Humans are not physiologically and anatomically well-adapted to the environmental conditions of diving, and various equipment has been developed to extend the depth and duration of human dives, and allow different types of work to be done. In ambient pressure diving, the diver is directly exposed to the pressure of the surrounding water. The ambient pressure diver may dive on breath-hold (freediving) or use breathing apparatus for scuba diving or surface-supplied diving, and the saturation diving technique reduces the risk of decompression sickness (DCS) after long-duration deep dives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Lock
An air lock is a restriction of, or complete stoppage of liquid flow caused by vapour trapped in a high point of a liquid-filled pipe system. The gas, being less dense than the liquid, rises to any high points. This phenomenon is known as vapor lock, or air lock. Flushing the system with high flow or pressures can help move the gas away from the highest point. Also, a tap (or automatic vent valve) can be installed to let the gas out. Air lock problems often occur when one is trying to recommission a system after it has been deliberately (for servicing) or accidentally emptied. For example, a central heating system using a circulating pump to pump water through radiators. When filling such a system, air is trapped in the radiators. This air has to be vented using screw valves built into the radiators. Depending on the pipe layout - if there are any upside down 'U's in the circuit - it will be necessary to vent the highest point(s). If not, air lock may cause waterfall flow where ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Table
The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water. It can also be simply explained as the depth below which the ground is saturated. The water table is the surface where the water pressure head is equal to the atmospheric pressure (where gauge pressure = 0). It may be visualized as the "surface" of the subsurface materials that are saturated with groundwater in a given vicinity. The groundwater may be from precipitation or from groundwater flowing into the aquifer. In areas with sufficient precipitation, water infiltrates through pore spaces in the soil, passing through the unsaturated zone. At increasing depths, water fills in more of the pore spaces in the soils, until a zone of saturation is reached. Below the water table, in the phreatic zone (zone of saturation), layers of permeable rock that yield groundwater are called aquifers. In less permeable soils, such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eminent Domain
Eminent domain (United States, Philippines), land acquisition (India, Malaysia, Singapore), compulsory purchase/acquisition (Australia, New Zealand, Ireland, United Kingdom), resumption (Hong Kong, Uganda), resumption/compulsory acquisition (Australia, Barbados, New Zealand, Ireland, United Kingdom), or expropriation (Argentina, Belgium, Brazil, Canada, Chile, Denmark, Finland, France, Germany, Greece, Italy, Mexico, Netherlands, Norway, Panama, Poland, Portugal, Russia, South Africa, Spain, Sweden, Serbia) is the power of a state, provincial, or national government to take private property for public use. It does not include the power to take and transfer ownership of private property from one property owner to another private property owner without a valid public purpose. This power can be legislatively delegated by the state to municipalities, government subdivisions, or even to private persons or corporations, when they are authorized by the legislature to exercise the functi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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