A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Pittsburgh's squirrel hill tunnel
Tunnel will measure 4225 ft between portal faces; each of reinforced concrete twin tunnels, 60 ft c to c, will contain 24-ft roadway and 2 ft 7 1/2 in. service walk; reinforced concrete lining will have minimum thicknesses of 27 in. in walls and 23 in. in arched roof; boring performed by three deck steel frame drill jumbo; holes are loaded with 40% strength gelatin dynamite, and fired by electric blasting caps.
Pittsburgh's squirrel hill tunnel
Tunnel will measure 4225 ft between portal faces; each of reinforced concrete twin tunnels, 60 ft c to c, will contain 24-ft roadway and 2 ft 7 1/2 in. service walk; reinforced concrete lining will have minimum thicknesses of 27 in. in walls and 23 in. in arched roof; boring performed by three deck steel frame drill jumbo; holes are loaded with 40% strength gelatin dynamite, and fired by electric blasting caps.
Pittsburgh's squirrel hill tunnel
Eng News-Rec
Engineering News-Record ; 142
1949
5 pages
Article (Journal)
English
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