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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.
Underground construction in Sapporo, Japan. Underground construction refers to the construction of underground tunnels, shafts, chambers, and passageways, [1] it is also sometimes used to describe the portion of traditional construction that takes place below grade.
A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length.
Coordinates: 40.894°N 73.890°W. New York City Water Tunnel No. 3 is a water-supply tunnel forming part of the New York City water supply system. It is being built by the New York City Department of Environmental Protection (NYCDEP) to provide New York City with a third connection to its upstate water supply. The tunnel will serve as a backup ...
The Channel Tunnel ( French: Tunnel sous la Manche ), sometimes referred to informally as the Chunnel, [ 3 ][ 4 ] is a 50.46-kilometre (31.35 mi) undersea railway tunnel, opened in 1994, that connects Folkestone ( Kent, England) with Coquelles ( Pas-de-Calais, France) beneath the English Channel at the Strait of Dover.
The Metropolitan Area Outer Underground Discharge Channel ( Japanese: 首都圏外郭放水路, Hepburn: shutoken gaikaku hōsuiro), popularly known as G-Cans, is an underground water infrastructure project in Kasukabe, Saitama, Japan. It is the world's largest underground flood water diversion facility, built to mitigate overflowing of the ...
The tunnel's incomplete south portal and the Downtown Seattle skyline, seen in September 2018 The completed south portal is seen behind Lumen Field in this aerial view.. The SR 99 tunnel is a single tube that measures 9,270 feet (2,830 m) long and 52 feet (16 m) wide, carrying a double-decker highway that is 32 feet (9.8 m) wide and has two lanes in each direction.
82,800 m (51.450 mi) 1972. Longest continuous enclosed aqueduct in the Southern Hemisphere (22.5 m 2 cross section). Built to divert water from the Orange River to the Great Fish River . Water supply. Bolmen Water Tunnel. Kronoberg / Scania, Sweden. 82,000 m (50.952 mi) 1987.
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