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A platform for research: civil engineering, architecture and urbanism
Steel tunnel supports at Anaconda's phosphate mine
Crosscut tunnel, or adit, being driven under Aspen Range at Conca, Idaho, to develop phosphate bed, is 9 ft. wide by 10 ft. high inside timbers and will be 8200 ft. long; structural-steel set, strong enough to carry 40 ton overhead load, designed to replace timber set; cap of I-beam section 12 in. deep by 10 ft. 2 in. long, weighing 508 lbs.; two posts of H section 6 in. deep by 10 ft. 3.5 in. long, 210 lb. each; two knee braces built up of angle irons; reinforced-concrete arch lining in wet section.
Steel tunnel supports at Anaconda's phosphate mine
Crosscut tunnel, or adit, being driven under Aspen Range at Conca, Idaho, to develop phosphate bed, is 9 ft. wide by 10 ft. high inside timbers and will be 8200 ft. long; structural-steel set, strong enough to carry 40 ton overhead load, designed to replace timber set; cap of I-beam section 12 in. deep by 10 ft. 2 in. long, weighing 508 lbs.; two posts of H section 6 in. deep by 10 ft. 3.5 in. long, 210 lb. each; two knee braces built up of angle irons; reinforced-concrete arch lining in wet section.
Steel tunnel supports at Anaconda's phosphate mine
Min. Congress Jl
Norris, E.M. (author)
1931
2 pages
2 Figs.
Article (Journal)
English
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