. Railroad structures and estimates . whole trestle will not be destroyed. Frame Trestles. Fig. 30a.] —The bents are made of squaretimber framed together and braced, the economic limit o:being probably 100 feet. The foundation may be piles cut offI around level, with timber sills on top or masonry piers. TheI res mu- - :._ > rigid by bracing transversely and longi-tudinally throughout. Approximate cost and quantities are given in table Xo. 35. Pile Trestles. Fig. 30. —The bents are formed of severalpiles with caps and sway bracing, the floor consisting of longi-tudinal strings: s with rose
. Railroad structures and estimates . whole trestle will not be destroyed. Frame Trestles. Fig. 30a.] —The bents are made of squaretimber framed together and braced, the economic limit o:being probably 100 feet. The foundation may be piles cut offI around level, with timber sills on top or masonry piers. TheI res mu- - :._ > rigid by bracing transversely and longi-tudinally throughout. Approximate cost and quantities are given in table Xo. 35. Pile Trestles. Fig. 30. —The bents are formed of severalpiles with caps and sway bracing, the floor consisting of longi-tudinal strings: s with rose ties, or solid plank with ballast flooron top. Owing to the long length of piles required, they rarely exceed30 feet in height. 7 ighta over 10 feet up to 20 feet, longitudinal bra<:: _ should be inserted at least every fifth panel; over 25 feet everyalternative panel should be braced, arranged so as to hold the; sta midway to stiffen - /imns. Approximate cost and quantities re given in tables Xo. 33and 34. TRESTLES. 67. Pile Bents6to 15 12x12x6 Sills Piles used inSoft or Swampy ground Fig. 30. Pile Trestle. Fig. 30a. Frame Trestle. a RAILROAD STRUCTURES AND ESTIMATES. TABLE 33. — PIL^. rRESTLE: SINGLE TRACK. (Fig. 30., ABB COST COMPLETE. len: a1015 :: 25 . r:_ -- : r: 35 30 :: -.: .:•:: :ys:^~ t. - . ■. B. II . m. Cost at mate total perft. v ; Ida cost per :: -r \r l»^> porB lineal Z> :• 1 ta. 10 220 $ 20 $ 9 2 70 230 : :\ :: 10 24 . H 12 -r. ■ -\ :-: 17 5 10 an -S lr : . 871 \ -.: 30 : K $ :: M 1: r: 13 TABLE 34. — ?ZLZ TRESTLE: SINGLE TRACK. Fiz. AND 3081 X . 15-foot cent :: :c::atz Z::::~ :: :■: ::: of cap. 5 :: 152025 •: No. :e~ Z - Bracing and floor system. A -: --- .-:.r .- -:: pa ------- 7- per Cost at B. ML $ Cost at mate total per 11. . 6 cents cost per per ft. of B. M. zT™ _ . -
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