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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 workers often work under reduced light condition, in dangerous spaces, and are at a high risk of exposure to contaminants, fire, and explosions. In the United States the Occupational Safety and Health Administration (OSHA) first adopted unique regulations for underground construction in 1971. OSHA regulates underground ...
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.
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. Communications utilities like fiber optics, cable television, and telephone cables are also sometimes carried. One may also be referred to as a services tunnel ...
The Boring Company (TBC) is an American infrastructure, tunnel construction services, and equipment company founded by Elon Musk. TBC was founded as a subsidiary of SpaceX in 2017, and was spun off as a separate corporation in 2018. TBC has completed one tunneling project that is open to the public, as well as multiple test tunnels.
Houston tunnel system. The Houston tunnel system is a network of subterranean, climate-controlled, pedestrian walkways that links 95 full city blocks 20 feet (6 m) below Houston 's downtown streets. It is approximately six miles (9.7 km) long. [1] There are similar systems in Chicago, Dallas, Oklahoma City, Montreal, and Toronto.
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.
The Eisenhower Tunnel, officially the Eisenhower–Edwin C. Johnson Memorial Tunnel, [1] is a dual-bore, four-lane vehicular tunnel in the western United States, approximately 60 miles (97 km) west of Denver, Colorado. The tunnel carries Interstate 70 (I-70) under the Continental Divide in the Rocky Mountains. With a maximum elevation of 11,158 ...