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Underground construction has a number of unique risks and challenges but shares a lot with traditional construction and mining. 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.
Gunpowder magazine. 1809 drawing by Benjamin Henry Latrobe showing the elevation, cross-section, and plan of a proposed gunpowder magazine. A gunpowder magazine is a magazine (building) designed to store the explosive gunpowder in wooden barrels for safety. Gunpowder, until superseded, was a universal explosive used in the military and for ...
It is a rapidly growing sector of the construction and civil engineering industry. It can be defined as "a family of methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities."
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.
NUCA.com. The National Utility Contractors Association (NUCA) is a trade association representing the underground utility industry in the United States. Founded in 1964, NUCA is the largest trade association for this industry in the country. [1] It represents contractors, suppliers, and manufacturers involved in water, sewer, gas, electric ...
An underground power line provides electrical power with underground cables. Compared to overhead power lines, underground lines have lower risk of starting a wildfire and reduce the risk of the electrical supply being interrupted by outages during high winds, thunderstorms or heavy snow or ice storms. An added benefit of undergrounding is the ...
Project Nike (Greek: Νίκη, "Victory") was a U.S. Army project, proposed in May 1945 by Bell Laboratories, to develop a line-of-sight anti-aircraft missile system. The project delivered the United States' first operational anti-aircraft missile system, the Nike Ajax, in 1953. A great number of the technologies and rocket systems used for ...
The clock will be almost entirely underground, and only accessed by foot traffic from the east once complete. Before building the public clock in Nevada, the foundation is building a full-scale clock of similar design in a mountain of the Sierra Diablo range near Van Horn, Texas. The test drilling for the underground construction at this site ...