. Concrete bridges and culverts, for both railroads and highways . «>l ■ ..J rPa § £•=• c e e» oo ^ o< ce 5 «ioa C -H B o •C T3 « a 1 I 2 ffl ZO OD OS. H 18 240 <n o * ^ ~* 0 *^ •: ^ n) 5< • « r ^ S:r .^1 « C» es ^ ^ o ■.* ^ ■* IS ^ d . o f£ X O ■O ^^ •c X O -j o _• ^~ CI 6 0. c O „ o o o tH ■^ 05 •* «M __ » tc in ^ ■* .21-^ ^S CI •■ n ■* il 02 :i^ v« N-* ^■ii „ M« c ■ 1 1 1 1-1 t- — t- tc t- ^ ft «D ^, T l-H •* 5C « t- e d -* 0. ^ iH r-1 CT Ol CC _5P 72. kI g M .- k< ee ■ foUowlc .50 o «w(S eg 2■3 a 0z u 5 <D S ui o a 0 C S ■3 n (4 < - * a Pi C « H 4) 0 S ■-<
. Concrete bridges and culverts, for both railroads and highways . «>l ■ ..J rPa § £•=• c e e» oo ^ o< ce 5 «ioa C -H B o •C T3 « a 1 I 2 ffl ZO OD OS. H 18 240 <n o * ^ ~* 0 *^ •: ^ n) 5< • « r ^ S:r .^1 « C» es ^ ^ o ■.* ^ ■* IS ^ d . o f£ X O ■O ^^ •c X O -j o _• ^~ CI 6 0. c O „ o o o tH ■^ 05 •* «M __ » tc in ^ ■* .21-^ ^S CI •■ n ■* il 02 :i^ v« N-* ^■ii „ M« c ■ 1 1 1 1-1 t- — t- tc t- ^ ft «D ^, T l-H •* 5C « t- e d -* 0. ^ iH r-1 CT Ol CC _5P 72. kI g M .- k< ee ■ foUowlc .50 o «w(S eg 2■3 a 0z u 5 <D S ui o a 0 C S ■3 n (4 < - * a Pi C « H 4) 0 S ■-< 0 8 arSteeOonBall 3 -5D O o O 242 COXCRETE BRIDGES AXD CULVERTS. track and ballast. The side beams are each 2 feetin Avidth, -while the center beam is 4 feet. The loadper lineal foot on the side beams varies from 8,500pounds for a 10-foot span to 9,300 pounds for a 24-foot span. Designs G and H. Figures 64, 65. These aredesigns for single track trestles, similar to E andF already described. They differ, however, in thatG and H have a 3-foot depth of earth and ballastfilling. Comparative Trestle Costs. The comparative costs for the foregoing trestlespans for both single and double track structuresis given on the chart, Figure 66. The horizontalordinates represent clear spans in feet, while thevertical ordinates give the costs in dollars for acomplete span, not including piers. This chartclearly shows that reinforced concr
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