A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
12-drill jumbo speeds tunneling cycle
How miners punched big horseshow tunnel through mile and half of solid mountain in Colorado Rockies 60 mi west of Denver; four drills worked on top and bottom decks and additional four were side mounted on jumbo riding rails into 8148 ft long tunnel; top rib sections, weighing 211 lb/ft were set with hydraulic equipment. (14299)
12-drill jumbo speeds tunneling cycle
How miners punched big horseshow tunnel through mile and half of solid mountain in Colorado Rockies 60 mi west of Denver; four drills worked on top and bottom decks and additional four were side mounted on jumbo riding rails into 8148 ft long tunnel; top rib sections, weighing 211 lb/ft were set with hydraulic equipment. (14299)
12-drill jumbo speeds tunneling cycle
Constr Methods Equip
1969
7 pages
Article (Journal)
English
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