. The Street railway journal . ersely and 18 ins. apart longitud-inally. To secure the concrete and key it thoroughly tothe vertical face of the fascia web and at the expansion with their lower ends discharging into cast-iron catch basinsplaced inside the main vertical columns. These catchbasins waste through vertical pipes carried down inside thecolumns to the street level, where they discharge to under-ground drains connected to the sewer. In the deep span construction the longitudinal girders aremade with lighter chords than those of the regular construc-tion and the knee-braces are omitted
. The Street railway journal . ersely and 18 ins. apart longitud-inally. To secure the concrete and key it thoroughly tothe vertical face of the fascia web and at the expansion with their lower ends discharging into cast-iron catch basinsplaced inside the main vertical columns. These catchbasins waste through vertical pipes carried down inside thecolumns to the street level, where they discharge to under-ground drains connected to the sewer. In the deep span construction the longitudinal girders aremade with lighter chords than those of the regular construc-tion and the knee-braces are omitted. The transverse girders 280 STREET RAILWAY JOURNAL. [Vol. XXIX. No. 7. at the column bents in the deep construction are of the same cars 46 ft. long over all, with 25,000-lb. loads on each ofdepth as the longitudinal girders, and like them are light the four axles, with provision for impact. The total weightlattice girders supporting the floor troughs on their top of the main steel superstructure is about 41,000,000 lbs., and. CROSS-SECTION OF THE MARKET STREET ELEVATED STRUCTURE, SHOWING FLOOR AND TRACK CONSTRUCTION flanges. The intermediate floor beams in the deep con-struction consist of latticed cross-frames. In the spans adjacent to the Schuylkill River, where the that of the solid floor type is about 2000 lbs. per linear work was designed and supervised by the PhiladelphiaRapid Transit Company, Wm. S. Twining, chief engineer.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
