. Railroad structures and estimates . 284 CONCRETE SNOW SHEDS. The columns, which are 24 in. wide parallel to the tracks,and 20 in. transverseh^ are 10 ft. apart center to center andcarry beams 24 in. wide and 3 ft. 3 in. deep. The roof slabs are10 in. thick. Both deformed and plain bars are used in the. Fig. 102. Shed against Rock and Rock and Earth. reinforcement, the deformed bars being mostly of the corrugatedtype. Expansion joints are placed both in the roof and in theretaining walls at intervals of 80 ft. Different designs have been prepared for the uphill side ofthe sheds in earth, rock
. Railroad structures and estimates . 284 CONCRETE SNOW SHEDS. The columns, which are 24 in. wide parallel to the tracks,and 20 in. transverseh^ are 10 ft. apart center to center andcarry beams 24 in. wide and 3 ft. 3 in. deep. The roof slabs are10 in. thick. Both deformed and plain bars are used in the. Fig. 102. Shed against Rock and Rock and Earth. reinforcement, the deformed bars being mostly of the corrugatedtype. Expansion joints are placed both in the roof and in theretaining walls at intervals of 80 ft. Different designs have been prepared for the uphill side ofthe sheds in earth, rock and earth, and rock cuts. Though notshown in the drawing the earth is backfilled behind the uphillwall and is carried up to form an even slope with the roof of theshed. In rock cuts with an earth overlay the upper part, whichreceives the earth load, is stronger in design than the lowerpart. In the lower portion a 6-in. face slab is used between the CONCRETE SNOW SHEDS. 285 columns while above a heavier slab is used and the wall is heldback at each column by a tie with reinforcing rods anchored intothe rock. The earth is backfilled up to the roof line. In the solid rock cuts the thin face wall is carried up to thefull height at a uniform thickness and the top is tied into therock as in the previo
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