Public works . ckets filled withasphalt, and the bearings of the girdersand floor slabs are made with tar paperto prevent adhesion between the fixedand moving surfaces. The arch spans cross the river andare substantially alike except for varia-tions in length. The 164-foot 3-inchcenter span has a rise of 36 feet, the other arch spans, has two mainribs 16 feet wide and 12^4 feet apartin the clear, with three-center curvesfor the intrados and extrados. Thetwo main radii of the intrados areabout 134 feet and 113 feet long. Theribs have crown depths of 3 feet forthe center and east span a
Public works . ckets filled withasphalt, and the bearings of the girdersand floor slabs are made with tar paperto prevent adhesion between the fixedand moving surfaces. The arch spans cross the river andare substantially alike except for varia-tions in length. The 164-foot 3-inchcenter span has a rise of 36 feet, the other arch spans, has two mainribs 16 feet wide and 12^4 feet apartin the clear, with three-center curvesfor the intrados and extrados. Thetwo main radii of the intrados areabout 134 feet and 113 feet long. Theribs have crown depths of 3 feet forthe center and east span and 2 feet 10inches for the west span, and those ofthe center span are reinforced longi-tudinally near the top and bottom of itwith forty-eight lj/-inch diameterbars, assembled with rectangular J/^-inch hooping in four sets of 12 barseach. Transversely, near the top ofthe ribs at the column bases, there areeleven J^-inch diameter rods, andthroughout the remainder of the ribsthere are %-inch diameter rods, 3 feet. COFFERDAM ANTD FORMS FOR CHANNEL PIERS BEFORE WATER LEVEL, IN RIVER WAS RAISED CONCRETING RIB FORMS SUPPORTED ON STEEL ARCH CENTER TRUSSES IN MAIN SPAN 220-FOOT HOISTING TOWER AND LOW LEVEL HOPPER AND CHUTES FOR SPOUTING CONCRETE TO FIRST 100 PUBLIC WORKS Vol. 52, No. 6 side of each rib. The tops of the exterior columnsare connected by reinforced fascia girders withcurved lower edges giving them an arched appear-ance. The octagonal columns, 20 inches in diameter,are each reinforced with eight -)4-inch vertical rodsand ^-inch spiral hooping of 3-inch pitch. The river piers and abutments are of hollow rein-forced concrete construction with longitudinal andtransverse vertical walls and diaphragms 30 inchesthick and 5 feet apart in the clear, which are bracedb)^ exterior buttresses extended to the edges of awide reinforced concrete footing 3 feet thick. Snow Clearing in Philadelphia The storm of January 28th was the most severe,it was reported, that the city of Washin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
