. Concrete bridges and culverts, for both railroads and highways . 2 Portals:—Concrete 74 =Steel 4720 lbs. (& .04^ Barrel per yds. (5 $ 515 lbs.@ .04= Length for 20 ft. bank:Area = 230 squareCost = $2930. $592 : 188 $780 =$46 4= $ 32 rig. 49. CONCRETE CULVERTS AND TRESTLES. 221 and 20 feet wide. For an area of this size a moreeconomical form is secured by using a double boxof the same general type. Figure 50 is a beam top culvert. 12 feet high and15 feet -wide. The culvert top is arched 3 feet andtlie arch strength is considered when propo
. Concrete bridges and culverts, for both railroads and highways . 2 Portals:—Concrete 74 =Steel 4720 lbs. (& .04^ Barrel per yds. (5 $ 515 lbs.@ .04= Length for 20 ft. bank:Area = 230 squareCost = $2930. $592 : 188 $780 =$46 4= $ 32 rig. 49. CONCRETE CULVERTS AND TRESTLES. 221 and 20 feet wide. For an area of this size a moreeconomical form is secured by using a double boxof the same general type. Figure 50 is a beam top culvert. 12 feet high and15 feet -wide. The culvert top is arched 3 feet andtlie arch strength is considered when proportioning
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