Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 444
undation to support the sewer Thefoundation is capped with reinforced concrete; and then the sewer,as shown in the section, is constructed on the pile foundation. Theconcrete for this work is composed of 1 part Portland cement, 2hparts sand, and 5 parts trap rock. The rock was crushed to pass… … Fig. 312, Girder Bridge near Allentown, Pa. This type of bridge has been found to be economical for short spans.Worn-out wooden and steel highway bridges are in general beingreplaced with reinforced-concrete bridges, and usually at a cost lessthan that of a steel bridge of the same strength. Steel…
Architecture · Building
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