. Railroad structures and estimates . 4° 30 5° 5° 30 6° 6° 30 /20 23 8 ^ /^ 3 8 1752 t H / II 31 78 15TR 30 33 8 * T5 1552 58 M 4^- Irf^TT u 1* Ifk Ui- n 2nV 40 43 6 1 3 1 u H li 2 2i ^ 21 3 3i 50 54 6 34 H^ 1* IM 2t\ m 3* 3i 3^ 4^^ 4f^ 5,V 60 66 0 H Hk H^ 2i 3^5 4 4tfe 5i 5i-| 6i^s 6i 7i 70 75 6 H 2i 3 3^ 4t 5t^r 6 6H 7/^ 8t^« 9 9f 80 86 0 11^ m 3* m 511 61 71 8* y^e^ lOU 11* 1 Of 90 97 8 2i 3f 5 6^ n 8f 10 IH 1 0^ 1 U 1 3 1 4i 100 103 5 m 41 51 7 8* 91 llA 1 01 1 2 1 3/« 1 4^3 1 6i 150 158 3 6- 9il 1 u 1 4§ 1 7i 1 11 2 2i 2 51 2 8H 3 Oi 3 3^ 3 6f Bridge and Trestle Guards.—It is usual to pla
. Railroad structures and estimates . 4° 30 5° 5° 30 6° 6° 30 /20 23 8 ^ /^ 3 8 1752 t H / II 31 78 15TR 30 33 8 * T5 1552 58 M 4^- Irf^TT u 1* Ifk Ui- n 2nV 40 43 6 1 3 1 u H li 2 2i ^ 21 3 3i 50 54 6 34 H^ 1* IM 2t\ m 3* 3i 3^ 4^^ 4f^ 5,V 60 66 0 H Hk H^ 2i 3^5 4 4tfe 5i 5i-| 6i^s 6i 7i 70 75 6 H 2i 3 3^ 4t 5t^r 6 6H 7/^ 8t^« 9 9f 80 86 0 11^ m 3* m 511 61 71 8* y^e^ lOU 11* 1 Of 90 97 8 2i 3f 5 6^ n 8f 10 IH 1 0^ 1 U 1 3 1 4i 100 103 5 m 41 51 7 8* 91 llA 1 01 1 2 1 3/« 1 4^3 1 6i 150 158 3 6- 9il 1 u 1 4§ 1 7i 1 11 2 2i 2 51 2 8H 3 Oi 3 3^ 3 6f Bridge and Trestle Guards.—It is usual to place outer and innerguards over the floors of all deck and trestle bridges. A verycommon method is to place wooden guards of 6 in. by 6 in. timberson the outside with old rails on the inside of the running rails asshown in Fig. 27a, two rails being used for deck and three railsfor through bridges for the inner guard. The outer guard isdapted two inches between floor beams to prevent bunching of 108 BRIDGE AND TRESTLE -11-8- -isy^- II I I 8x lOTie 13olg. 8 X 16 Tie 13 0 \g. THRO BRIDGES HALF DECK BRIDGES Fig. 27a. Bridge and Trestle Guards. %xl2 Lag ScrewA >/ ,—, every 3rd Tie Guard Rail ^^ ^tag Screw on every Tie ^^T x8xl0 ,^ V on ev 5i(x 30Boltthrough Cap <■ -3-8- Cap 12x14x14
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Keywords: ., bookauthororrockjohnwilson1870, bookcentury1900, bookdecade1910
