. Railroad structures and estimates . Boulders. SINGLE BOXFig. 23. Wood Box Culverts. TABLE 22. — APPROXIMATE COST. ETC. Size. Kind. F:. ft. Cost at$30 per If. Paving,sq. ft. Cost at%2 persq. yd. T Iron. lbs.,.per ft. Cost at 5 cts. per lb. perft. com-plete. Ft. 2X4 Single 90 $ $ 6 as. 30 2X4 Double 150 10 10 50 4X4 Single 175 05 15 75 4X4 Double 275 20 ISO Sheet pile at ends when scouring is likely to and refilling extra. BRIDGES. 53 CHAPTER IV. BRIDGES, TRESTLES, RETAINING WALLS, C
. Railroad structures and estimates . Boulders. SINGLE BOXFig. 23. Wood Box Culverts. TABLE 22. — APPROXIMATE COST. ETC. Size. Kind. F:. ft. Cost at$30 per If. Paving,sq. ft. Cost at%2 persq. yd. T Iron. lbs.,.per ft. Cost at 5 cts. per lb. perft. com-plete. Ft. 2X4 Single 90 $ $ 6 as. 30 2X4 Double 150 10 10 50 4X4 Single 175 05 15 75 4X4 Double 275 20 ISO Sheet pile at ends when scouring is likely to and refilling extra. BRIDGES. 53 CHAPTER IV. BRIDGES, TRESTLES, RETAINING WALLS, CRIBS, TUNNELS. Bridges. Deck Plate Girders. (Fig. 24.) — Deck plate bridges aremade of steel plates and angles, fabricated and riveted up intogirders, etc., in the shops. The girders are placed at 9 feet centers more or less, and are heldlaterally by steel brace frames at varying intervals placed cross-wise, and by longitudinal bracing top and bottom. Usually the span is completely shop-riveted and shipped readyto drop into place, so that
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