. Railroad structures and estimates . H. Deck f\\ Through Fig. 28. Half Deck and Through Drawbridges. TABLE 27.— APPROXIMATE WEIGHT AND COST OF STEEL DRAWBRIDGES (SINGLE TRACK). 3A 130 250 3 -2 w +j —i cp 3# +3 -S3 £ 1 cD S3CD C+S IDCO -l^> *3 X!CI o 8 *H 53 co •- CO Pi ■5 es S3 fo —1 CO Ui O co 53 w CO co b •t-iO ° O * ^ o *tt r/i 0) o bo 2 ° 2 o o js3 f-> £ 8 oH ftp s S «-i g K> a « (i .-In > «t-i< ° O += £ o 4) — 53 £ BH c3 Ft. In. Lbs. Lbs. Dols. Inches. Ft. Dols. Dols. H. deck pi. 12 7 75,000 1070 3,750 8X15 70 420 4,170 Deck pi. 9 0 216,000 1670 10,800 8X16 130 780 1
. Railroad structures and estimates . H. Deck f\\ Through Fig. 28. Half Deck and Through Drawbridges. TABLE 27.— APPROXIMATE WEIGHT AND COST OF STEEL DRAWBRIDGES (SINGLE TRACK). 3A 130 250 3 -2 w +j —i cp 3# +3 -S3 £ 1 cD S3CD C+S IDCO -l^> *3 X!CI o 8 *H 53 co •- CO Pi ■5 es S3 fo —1 CO Ui O co 53 w CO co b •t-iO ° O * ^ o *tt r/i 0) o bo 2 ° 2 o o js3 f-> £ 8 oH ftp s S «-i g K> a « (i .-In > «t-i< ° O += £ o 4) — 53 £ BH c3 Ft. In. Lbs. Lbs. Dols. Inches. Ft. Dols. Dols. H. deck pi. 12 7 75,000 1070 3,750 8X15 70 420 4,170 Deck pi. 9 0 216,000 1670 10,800 8X16 130 780 11,580 Thro latt. 18 6 750,000 3000 37,500 8X10 250 1500 39,000 BRIDGES. 61 Bridge Abutments. Abutments may be built either of stone or concrete. For thelatter, if current is strong, the up-stream corners should be stone-faced. Leave 4-inch clearance between face of ballast wall andend of girders. Frost batter of walls to be finished smooth. -*|AJ<-. PLAN Fig. 29. Bridge Abutments. Bridge seats to be finished to a dead level throughout on tangents,and on curves given a slope parallel to the super-elevation of theouter rail, including tie seat on the ballast wall. On curves locate abutments normal to chord of span. - ?..-.:!?.:.-.: h~:z~~.z^ a:~ i-t:;: .71- FOR lYRTK PT 4TK niRTkFH^ 7 r : - z:: _ - - -- -: • . A - :; 14 i» __ .-: :: 34 :■: ^ T-~- -: - - i _ HI .-- - - i :: 7: Ll r- -. .: _ 3 9 ; ■ :4 ... : i: j : ir! *■. - _ - i:_4 :: . i 1 6 :■:- -:-: ::: . \ _ .: ;■. :•:•: :*: >n I:.: :::: 4r! . -: : 6 :■: :■« ::• 1*4 :-: :•:: 114! :::« :■: 2 9 6 6 :: 70 :;: :■: :: ;--: •::, - ::>: -:: : : 1 o :: 1:4 ::-: .-■■. :• ::. !; r : 11*4 :: : : 9 0 -, :.! :-\ .- : rl. - ; ::■:•: ;.>r ;: : -: 10 0 n ::•: lr« % :1: i::4 \.:\ :-: 4 . 10 6 ■-: :;: :■:: ■ - - ; r * i:::- ::■?:
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