. Railroad structures and estimates . 0 10 0 150,000 :r:: _r:: ; 14 110 -:r: -:: BRIDGES. 57 Base of Rail CO a Lg. over all A,J- 3—Br. Seat _\ -Span- Fig. 25. Half Deck Plate Girders, 13 ft. centers. ^-Wood Ties & TABLE 24. — APPROXIMATE WEIGHT AND COST OF STEEL HALF DECKPLATE BRIDGES (SINGLE TRACK). Length over all, ft. 30 40 50 60 70 80 Base of rail to bridge seat, ft. and in. B. 1 7 1 7 1 7 2 64 0 4 9 5 9 Depthback toback of angles,ft. and C. Totalweight. ,000 21,000 30,000 42,500 60,000 80,500 100,000 Weightof steelper ft. ofbridge. 700 750 850 1000 1150 1250 Cost of ste
. Railroad structures and estimates . 0 10 0 150,000 :r:: _r:: ; 14 110 -:r: -:: BRIDGES. 57 Base of Rail CO a Lg. over all A,J- 3—Br. Seat _\ -Span- Fig. 25. Half Deck Plate Girders, 13 ft. centers. ^-Wood Ties & TABLE 24. — APPROXIMATE WEIGHT AND COST OF STEEL HALF DECKPLATE BRIDGES (SINGLE TRACK). Length over all, ft. 30 40 50 60 70 80 Base of rail to bridge seat, ft. and in. B. 1 7 1 7 1 7 2 64 0 4 9 5 9 Depthback toback of angles,ft. and C. Totalweight. ,000 21,000 30,000 42,500 60,000 80,500 100,000 Weightof steelper ft. ofbridge. 700 750 850 1000 1150 1250 Cost of steel at 5 cts. per lb. Bridge ties at 12 in. centers. 1050 1500 2125 3000 4025 5000 8X16 8X16 8X16 8X16 8X16 8X16 Aver. length of floor system. 40 50 60 70 80 90 Cost offloor system per ft. 200 250 300 350 400 450 Totalcost of steel and floorsystem. 1250 1750 2425 3350 4425 5450 Notes. For quantities in abutments and piers, see pages 62, 63, and 64. 58 RAILROAD STRUCTURES AND =*? Fig. 26. Deck Lattice Rivetted Trusses. TABLE 25. — APPROXIMATE WEIGHT AND COST OF STEEL DECK LATTICERIVETED TRUSS BRIDGES (SINGLE TRACK). c S3 - -d g S a «- w o ° h 2 I 9 16 18 O -g 13 * £ 3 3 - fe 2 > - = •_ o i c — CO •3 0 — g 09 03 c 2 ►3 « Q ° B. Ft. In. 13 0 C. Ft. In. 10 6 125 16 0 13 0 150 27 3 25 6 175 900 28 6 30 fi 28 0 30 0 ,000 225,000 315,000 420,000 o i- S3~ — s - - S> o • — = — b — B n >a— m O :_ >. fa X -_ •_ - o B o o 73 S3 c 2 o * s - ^ o >< o rt a i Dols. Do Is. In. Ft. Dols. 1500 7,500 8X14 110 550 8,050 1800 11,250 8X14 135 675 11,925 2100 15,750 8X10 160 800 16,550 2400 21,000 8X10 185 925 21,925 2700 27,000 8X10 210 1050 28,050 a For quantities in abutments and piers, see pages 62, 63, and 64. BRIDGES. 59
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