. Railroad structures and estimates . pe of bridge is convenient, and used to a large extentwhere the bridge clearance is limited. The wood floor betweengirders is the cheapest, but steel floor beams and stringers isbetter construction. Approximate weight and cost of Half Deck Plate Girder Spansfrom 20 to 80 feet are given in Table 51 (wood floor betweengirders). WEIGHT OF STEEL SPANS. 103 Base of BaU. Wood Ties -gc. to c. H TABLE 50. Fig. 23. Deck Plate Girdfers, 9 0 centers. APPROXIMATE WEIGHT AND COST OF STEEL DECK PLATEBRIDGES (SINGLE TRACK). Lengthover all. A. Base ofrail tobridge
. Railroad structures and estimates . pe of bridge is convenient, and used to a large extentwhere the bridge clearance is limited. The wood floor betweengirders is the cheapest, but steel floor beams and stringers isbetter construction. Approximate weight and cost of Half Deck Plate Girder Spansfrom 20 to 80 feet are given in Table 51 (wood floor betweengirders). WEIGHT OF STEEL SPANS. 103 Base of BaU. Wood Ties -gc. to c. H TABLE 50. Fig. 23. Deck Plate Girdfers, 9 0 centers. APPROXIMATE WEIGHT AND COST OF STEEL DECK PLATEBRIDGES (SINGLE TRACK). Lengthover all. A. Base ofrail tobridge Depthback toback Totalweight. Weightof steelper ft. ofbridge. Cost of steel at 5 cts. per lb. Bridge ties at 12-in. centers. Aver-age lengthof floorsystem. Cost offloor at $5 perft. Totalcost of steel and floorsystem. Ft. Ft. In. Ft. In. Lbs. Lbs. In. Ft. 20 3 9 2 6 12,000 600 $600 8X14 30 $150 $750 30 4 6 3 0 19,500 650 975 8X 14 40 200 1175 40 5 6 4 0 28,000 700 1400 8X14 50 250 1650 50 6 6 5 0 40,000 800 2000 8X14 60 300 2300 60 8 0 6 0 57,000 950 2850 8X 14 70 350 3200 70 9 0 7 0 73,500 1050 3675 8X 14 80 400 4075 80 10 0 8 0 92,000 1150 4600 8X 14 90 450 5050 90 11 6 9 0 121,500 1350 6075 8X 14 100 500 6575 100 13 0 10 0 150,000 1500 7500 8X 14 110 550 8050 Base of Rail t: -Lg. over all .A-*- -Br. Seat. -Span- Fig. 24. Half Deck Plate Girders, 13 ft. centers. ^Wood Ties 13^ TA
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Keywords: ., bookauthororrockjohnwilson1870, bookcentury1900, bookdecade1910
