. Concrete bridges and culverts, for both railroads and highways . 2 Portals:— Concrete 88 yds. @ $ per lin. ft. (S$$ Steel 150 lbs. ^: .04= 6 6$55 6 If foundation Is depressed asshown dotted, tlien area = 172square feet. Len^lh for 20 ft. bank = 32ft. st = *24fO. Fig. 51. Figure 52 is a reinforced concrete box culvert ofbeam and slab construction, 12 feet high and 20 feetwide. For so large an area, a double box of thesame type will be more economical. Figure 53 is a culvert of the same dimensions asFigure 52, with solid concrete side walls, bottomcobbl
. Concrete bridges and culverts, for both railroads and highways . 2 Portals:— Concrete 88 yds. @ $ per lin. ft. (S$$ Steel 150 lbs. ^: .04= 6 6$55 6 If foundation Is depressed asshown dotted, tlien area = 172square feet. Len^lh for 20 ft. bank = 32ft. st = *24fO. Fig. 51. Figure 52 is a reinforced concrete box culvert ofbeam and slab construction, 12 feet high and 20 feetwide. For so large an area, a double box of thesame type will be more economical. Figure 53 is a culvert of the same dimensions asFigure 52, with solid concrete side walls, bottomcobblestone pavement, and roof reinforced with dou-ble lines of 60-pound track rails, united with ^-inch. Figure 54 is a reinforced concrete arch culvertwith buttressed side walls and slab similar to this are used by the NorthernPacific Railroad. COXCRIITR CriARRTS AND TRESTLES. 22?..
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