Chicago : Engineering and Contracting Pub. Co. · leaf 196
Reinforcing- Steel A. Hoist Airway. Fig. 7—Types of Concrete Lined HoistShafts. for the mine fire expert. A reinforced con-crete bunton seems ideal in a good many waysand its cost would be no more than an allsteel bunton of standard section. A smallsteel I beam or H beam wrapped with ex-panded…
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