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A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from steel and covered in polyethylene, usually semi-circular, square or elongated in shape.
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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.
On October 5, 2018, the Hawthorne City Council granted an easement for up to 2,600 meters (8,600 ft) of tunnel, in exchange for a structural encroachment fee of $2.5 million. Permission for the first 210 meters (700 ft) of tunnel under SpaceX's own land had been obtained earlier. [11]
7.2–7.6 meters in diameter (45 m 2 cross section). Part of a wider complex of tunnels that are 72 kilometers in length combined. Water supply Quabbin Aqueduct: Massachusetts, United States 39,600 m (24.606 mi) 1933 Metro Chengdu Metro Line 4: Chengdu, China 39,300 m (24.420 mi) 2015–2017 Metro Chengdu Metro Line 7: Chengdu, China
Portland Tunnel, single 3-lane tunnel carrying eastbound traffic, Interstate 94 near downtown Minneapolis; METRO Blue Line airport tunnels, 1.4 mi (2.3 km) twin bore light rail tunnels, 70 ft (21 m) under Runways 12L/30R and 12R/30L at Minneapolis–Saint Paul International Airport; Terminal 1–Lindbergh station is midway through the tunnel ...
Part of a group of two consecutive tunnels: 8.5 km (5.3 mi) and 1.9 km (1.2 mi) Many more tunnels exist that are shorter than 10 kilometres (6 mi) Under construction
This utility tunnel in Prague is equipped with railway tracks for maintenance vehicles. A utility tunnel, utility corridor, or utilidor is a passage built underground or above ground to carry utility lines such as electricity, steam, water supply pipes, and sewer pipes.