Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Shaft raising in Alabama
Ventilation shaft 18 ft in diam and 230 ft deep was raised at coal mine near Birmingham, Ala; pregrouting to insure dry shaft was done by diamond core drilling and step grouting; center diamond drill hole was drilled from surface into entry below; 43 nine inch holes were drilled on three circle pattern; shooting and mucking were finished in 21 days on single shift basis; costs and safety record on project were good.
Shaft raising in Alabama
Ventilation shaft 18 ft in diam and 230 ft deep was raised at coal mine near Birmingham, Ala; pregrouting to insure dry shaft was done by diamond core drilling and step grouting; center diamond drill hole was drilled from surface into entry below; 43 nine inch holes were drilled on three circle pattern; shooting and mucking were finished in 21 days on single shift basis; costs and safety record on project were good.
Shaft raising in Alabama
Min Congress J
Smith, E.P. (Autor:in) / Foust, D.T. (Autor:in)
1964
6 pages
Aufsatz (Zeitschrift)
Englisch
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