Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Change in line of Norfolk and Western Railroad in West Virginia required construction of double track tunnel 7135 ft long, 36 ft wide, and 38 ft high; it will be concreted, 18 in. thick over steel supports; jumbo is 3-deck working platform which permits 35 workmen on 15 pneumatic drills to drill rock ahead; tunnel excavation required 60% Gelatin Extra, 1 1/2-in. by 8-in.
Change in line of Norfolk and Western Railroad in West Virginia required construction of double track tunnel 7135 ft long, 36 ft wide, and 38 ft high; it will be concreted, 18 in. thick over steel supports; jumbo is 3-deck working platform which permits 35 workmen on 15 pneumatic drills to drill rock ahead; tunnel excavation required 60% Gelatin Extra, 1 1/2-in. by 8-in.
Twelve-million-dollar short cut
Explosives Engr
Counts, R.H. (Autor:in)
Explosives Engineer ; 27
1949
4 pages
Aufsatz (Zeitschrift)
Englisch
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