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OSHA regulates underground construction by companies and federal agencies but does not regulate underground construction activities associated with mining. [1] Underground construction is one of the most dangerous industries in the world but is becoming safer, especially as the most dangerous jobs are automated. [10]
Above-ground lines cost around $10 per 1-foot (0.30 m) and underground lines cost in the range of $20 to $40 per 1-foot (0.30 m). [10] In highly urbanized areas, the cost of underground transmission can be 10–14 times as expensive as overhead. [11] However, these calculations may neglect the cost of power interruptions.
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.
A ground-coupled heat exchanger is an underground heat exchanger that can ... buried 1.5 to 3 m (4.9 to 9.8 ft) underground where the ambient earth temperature is ...
The Raven Rock Mountain Complex (RRMC), also known as Site R, is a U.S. military installation with an underground nuclear bunker near Blue Ridge Summit, Pennsylvania, at Raven Rock Mountain that has been called an "underground Pentagon". [3] [4] [5]: 2 The bunker has emergency operations centers for the United States Army, Navy, Air Force, and ...
Utility locating is the process of identifying and labeling public utility mains that are underground. These mains may include lines for telecommunication , electricity distribution , natural gas , cable television , fiber optics , traffic lights , street lights , storm drains , water mains , and wastewater pipes.