A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
How precast concrete manholes today save time and money for Northern States Power Co on construction work on Minneapolis underground system; manholes are installed as caissons; manhole is set in hole dug by clamshell bucket which keeps digging as caisson keeps sinking; assembly line production, developed by concrete products company, has been big factor in reducing costs.
How precast concrete manholes today save time and money for Northern States Power Co on construction work on Minneapolis underground system; manholes are installed as caissons; manhole is set in hole dug by clamshell bucket which keeps digging as caisson keeps sinking; assembly line production, developed by concrete products company, has been big factor in reducing costs.
Precast manholes cut costs 35%
Elec World
Berner, J.A. (author)
Electrical World ; 143
1955
3 pages
Article (Journal)
English
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