. Railroad structures and estimates . pa , -> Fie:. 21. Rail Concrete Culvert. A. Span. 4 6 8 10 TABLE 20. — APPROXIMATE COST, ETC., SINGLE : 1 cement, 3 sand, and 5 broken stone. Concrete. B Depth. Ft. In. 9 6 9 6 10 6 11 6 c. Length. Costat S10 per yd. Ft. 0 39 S390 21 0 42 420 24 0 53 530 26 0 64 640 Rails. Tonsrails. Costat $22 S24313844 Paving. Cost at per ton. ~ , £ per yd 10152535 Riprap. 8 16244^ Costat $3per yd, S244872 144 Totalcost. $ Excavating and refilling extra. CULVERTS
. Railroad structures and estimates . pa , -> Fie:. 21. Rail Concrete Culvert. A. Span. 4 6 8 10 TABLE 20. — APPROXIMATE COST, ETC., SINGLE : 1 cement, 3 sand, and 5 broken stone. Concrete. B Depth. Ft. In. 9 6 9 6 10 6 11 6 c. Length. Costat S10 per yd. Ft. 0 39 S390 21 0 42 420 24 0 53 530 26 0 64 640 Rails. Tonsrails. Costat $22 S24313844 Paving. Cost at per ton. ~ , £ per yd 10152535 Riprap. 8 16244^ Costat $3per yd, S244872 144 Totalcost. $ Excavating and refilling extra. CULVERTS. 51. LONGITUDINAL SECTION Fig. 22. Stone Box Culverts. TABLE 21.—APPROXIMATE COST, : Rubble Masonry, in Cement Mortar. Body. Paving. Totalcostperlin. ft. Add for 2 end wing walls. Size. Cu. yds. per lin. ft. Cost at Spopercu. yd. ft. Cost at $ Cost tit 9pO. Rip-rap, Cost at $2 per yd. Totalcostfor 2 end walls, etc. Ft. Cts. 3X3 $ .30 45 $ 7 $ $ $ 3X4 .30 45 12 4X4 .40 60 12 4X5 .50 75 19 5X5 .50 75 19 5X6 .60 90 27 Excavating and refilling extra. 52 RAILROAD STRUCTURES AND ESTIMATES. Cedar Box Culverts. (Fig. 23.) —To be used only when pipeor concrete culverts cannot be placed economically. In sandembankments use side frames as shown in dotted lines.
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