. Strutture e stime ferroviarie . 505.8 137.7 6.53 3 1.^3.0 829.1 126 5 1038.3 123,3 1152.8 120 3 1284.8 117 0 1466 3 52 54 1.51 5 .524 1 143.7 677 5 1.39 0 860.3 132.5 1077.2 129 3 1196 4 126.3 1.334.2 123 0 1410 0 54 5« 1.57 5 .542 4 149.7 701 7 145 0 891.5 138.5 1115 9 135 3 1240 0 1.32 3 1383 5 129 0 1471 7 56 58 163 5 .560 6 1.5.5.7 726 0 151 0 922,7 144.5 1154 8 141 3 1283 5 1.38 3 14.32 9 135 0 1524 3 68 60 169 5 579 U 161.7 7.502 1.57 0 9.53.9 150 5 1193 7 147 3 1327 I 144 3 14S2 3I41 0 1.577 1 60 162 CULLERINI AD ARCO IN CALCESTRUZZO. Cemento Arch Culverts. (Fig., 52.) Miscela: Un cemento,3

• Collaboratore: Reading Room 2020 / Alamy Foto Stock
• ID dell’immagine: 2CR8JGP
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. Railroad structures and estimates . 505.8 137.7 6.53 3 1.^3.0 829.1 126 5 1038.3 123, 3 1152.8 120 3 1284.8 117 0 1466 3 52 54 1.51 5 .524 1 143.7 677 5 1.39 0 860.3 132.5 1077.2 129 3 1196 4 126.3 1.334.2 123 0 1410 0 54 5« 1.57 5 .542 4 149.7 701 7 145 0 891.5 138.5 1115 9 135 3 1240 0 1.32 3 1383 5 129 0 1471 7 56 58 163 5 .560 6 1.5.5.7 726 0 151 0 922, 7 144.5 1154 8 141 3 1283 5 1.38 3 14.32 9 135 0 1524 3 68 60 169 5 579 U 161.7 7.502 1.57 0 9.53.9 150 5 1193 7 147 3 1327 I 144 3 14S2 3I41 0 1.577 1 60 162 CONCRETE ARCH CULVERTS. Concrete Arch Culverts. (Fig, 52.) —Mixture: One cement, 3 sand and 5 broken stone. Excavating, laying, and refillingextra. See Table 79. Settlement. — In places where settlement is likely to occurbuild in 8 or 10-foot lengths, separated with a heavy layer oftarred felt. Joints to be vertical and the width of base increased. No filling to be done before concrete has thoroughly set, theminimum time allowed being two weeks. Material up to this line IncludedVI in quantities for End Walls^.

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