A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Hazardous tunneling at Hetch Hetchy
Report on driving operations on last section of 28.6 mi of Coast Range tunnel, for Hetch Hetchy water-supply system of San Francisco, Calif; special methods for combating gas hazard; sublining of pneumatically sprayed concrete replaces timbering in squeezing ground; ventilating system; light and power circuits; testing for gas and rescue work; operating cycle.
Hazardous tunneling at Hetch Hetchy
Report on driving operations on last section of 28.6 mi of Coast Range tunnel, for Hetch Hetchy water-supply system of San Francisco, Calif; special methods for combating gas hazard; sublining of pneumatically sprayed concrete replaces timbering in squeezing ground; ventilating system; light and power circuits; testing for gas and rescue work; operating cycle.
Hazardous tunneling at Hetch Hetchy
Eng News-Rec
Engineering News-Record ; 110
1933
4 pages
Article (Journal)
English
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