. Railroad structures and estimates . CO^iOcO(NrO*iOtO(NCOTjHiOtO cS a GO d CO O (M ■<* t—1 y—i l—1 co e 5 c 0) B5 Q tHaO |tH it-4 i ^ ~ - O 1—( »—t 1—1 W G «** riH d C H*> Hob HS Hm1-1 SO t^- OS i— Cm -^ »0 CO t- W cHS HS 31 o i—i O i—• »-«-M CO O i-l CO Clj i-H 1—1 T-t i-J £ C© (M CD CO ■^ (M CO CO ■**-> O c CO CO OS i-H 50 RAILROAD STRUCTURES AND ESTIMATES. Rail Concrete Culverts. For permanent structures where there is insufficient head-roomfor culvert pipes or concrete arch culverts, rail concrete culvertsare used. The spans given are from 4 to 10 feet, the arrangement consisting
. Railroad structures and estimates . CO^iOcO(NrO*iOtO(NCOTjHiOtO cS a GO d CO O (M ■<* t—1 y—i l—1 co e 5 c 0) B5 Q tHaO |tH it-4 i ^ ~ - O 1—( »—t 1—1 W G «** riH d C H*> Hob HS Hm1-1 SO t^- OS i— Cm -^ »0 CO t- W cHS HS 31 o i—i O i—• »-«-M CO O i-l CO Clj i-H 1—1 T-t i-J £ C© (M CD CO ■^ (M CO CO ■**-> O c CO CO OS i-H 50 RAILROAD STRUCTURES AND ESTIMATES. Rail Concrete Culverts. For permanent structures where there is insufficient head-roomfor culvert pipes or concrete arch culverts, rail concrete culvertsare used. The spans given are from 4 to 10 feet, the arrangement consistingof concrete retaining walls, sloped with the bank, with concretereinforced floor over, 10 to 12 inches thick, the reinforcement beingold rails embedded in the concrete at about 12-inch centers. Thefloor is paved with field stones, and the ends of walls riprappedwhen pa , -> Fie:. 21. Rail Concrete Culvert. A. Span. 4 6 8 10 TABLE 20. — APPROXIMATE COST, ETC., SINGLE : 1 cement, 3 sand, and 5 broken stone. Concrete. B Depth. Ft. In. 9 6 9 6 10 6 11 6 c. Length. Costat S10 per yd. Ft. 0 39 S390 21 0 42 420 24 0 53 530 26 0 64 640 Rails. Tonsrails. Costat $22 S24313844 Paving. Cost at per ton. ~ , £ per yd 10152535 Riprap. 8 16244^ Costat $3per yd, S244872 144 Totalcost. $ Excavating and refilling extra. CULVERTS. 51
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