A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Methods and costs of sinking circular concrete-lined ventilation shaft
Vertical air shaft in Birmingham, Ala, iron district was sunk with circular cross section and lined with concrete; method of sinking shaft and costs in man-hours with descriptive list of equipment and statement on size and use of temporary buildings; shaft was completed at depth of 1680 ft.
Methods and costs of sinking circular concrete-lined ventilation shaft
Vertical air shaft in Birmingham, Ala, iron district was sunk with circular cross section and lined with concrete; method of sinking shaft and costs in man-hours with descriptive list of equipment and statement on size and use of temporary buildings; shaft was completed at depth of 1680 ft.
Methods and costs of sinking circular concrete-lined ventilation shaft
US Bur Mines -- Information Cir
Williams, L. (author)
1960
31 pages
Report
English
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