A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Twin bores of squirrel hill tunnel each advance 24 ft per day
Photographs with brief data on drilling, blasting, mucking out and setting steel tunnel ribs; blasting is by electric cap method, using delays of 1-sec intervals in numbers 0 to 13; Hercules detonators and gelatin extra strength powder used.
Twin bores of squirrel hill tunnel each advance 24 ft per day
Photographs with brief data on drilling, blasting, mucking out and setting steel tunnel ribs; blasting is by electric cap method, using delays of 1-sec intervals in numbers 0 to 13; Hercules detonators and gelatin extra strength powder used.
Twin bores of squirrel hill tunnel each advance 24 ft per day
Civ Eng (NY)
1949
Article (Journal)
English
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