File:Economic Papers (1912) (14765420734).jpg

Identifier: economicpapers2228unse (find matches)
Title: Economic Papers
Year: 1912 (1910s)
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Publisher: Raleigh : N.C. Geological Survey
Contributing Library: State Library of North Carolina, Government & Heritage Library
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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to 3.00 Foreman, moving, cleaning up, etc 1.00 Plain concrete (per cubic yard) $5.85 to $9.50 Reinforcing steel (0.5% to 0.8%), 66 to 106 pounds @ 3c. per pound in place 2.00 to 3.20 Reinforced concrete per cubic yard $7.85 to $12.70 It will be seen that the cost of hauling and the cost of stone or gravelwill greatly influence the cost of the concrete. I-BEAM BRIDGES. Steel I-beam bridges (with plank floors) resting on stone or concreteabutments may be used to advantage in places where the span is longand the money available is small. They are, however, not as durableor as satisfactory as solid concrete structures. Concrete floors aresometimes used, but as a rule it is better to use a plank floor or to buildthe entire bridge of concrete, omitting the I-beams. Fig. 14 gives a design similar to that used by the American BridgeCompany and Table IX gives the sizes and amounts of material inthese bridges. Material for bridges of this type will cost between 3c.and 4c. per pound, delivered.
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