Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Deepening of 300-ft wide channel from 21-ft depth to 28 ft, in length of 3 mi, 1 mi consisting of rock, is described; dredging, hydraulic dredging, and new kind of drill-boat used; boat has Joy 500 air drills, mounted on operating towers on rails; average drilling depth is 11 1/2 ft and bit size is 4 1/2 in.; drill pattern is 10×10 ft with 12 holes drilled in range; use of guide pipe and sand pipe; explosives inserted through charging tube and pushed out from tube by tamping pole.
Deepening of 300-ft wide channel from 21-ft depth to 28 ft, in length of 3 mi, 1 mi consisting of rock, is described; dredging, hydraulic dredging, and new kind of drill-boat used; boat has Joy 500 air drills, mounted on operating towers on rails; average drilling depth is 11 1/2 ft and bit size is 4 1/2 in.; drill pattern is 10×10 ft with 12 holes drilled in range; use of guide pipe and sand pipe; explosives inserted through charging tube and pushed out from tube by tamping pole.
New deeper channel for St. Mary's River
Explosives Engr
Adams, J.W. (Autor:in)
Explosives Engineer ; 36
1958
3 pages
Aufsatz (Zeitschrift)
Englisch
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