. The Street railway journal . T The total quantities involved include approximately 250,000cu. yds. of excavation, 45,000 yds. of concrete and 1500 tons ofsteel. The estimated minimum cost is about $500 per linealfoot. The standard subway construction has an outside width ofabout 55 ft. and a height of 19 ft., with concrete walls about3 ft. thick, concrete roof about 2 ft. thick and concrete floorabout 17 ins. in minimum thickness. The roof slab is a con-tinuous mass of concrete, reinforced liy longitudinal and trans- reinforced by horizontal longitudinal and transverse rods, andare construct
. The Street railway journal . T The total quantities involved include approximately 250,000cu. yds. of excavation, 45,000 yds. of concrete and 1500 tons ofsteel. The estimated minimum cost is about $500 per linealfoot. The standard subway construction has an outside width ofabout 55 ft. and a height of 19 ft., with concrete walls about3 ft. thick, concrete roof about 2 ft. thick and concrete floorabout 17 ins. in minimum thickness. The roof slab is a con-tinuous mass of concrete, reinforced liy longitudinal and trans- reinforced by horizontal longitudinal and transverse rods, andare constructed separately from the floor into which they arerabbeted. The side walls are reinforced with ij^-in. vertical rods, 8 , and ^-in. horizontal rods 2 ft. apart. In the plane ofeach bent the vertical rods are replaced by 3-in. x 31, and at intervals of 25 ft. the wall is recessed to form arefuge niche, 4 ft. wide andT 16 ins. deep. The concrete floorhas no reinforcement rods and the upper side between columns. PLAN OF UNDERGROUND STATION AT NINETEENTH STIi,EET verse horizontal steel rods, and is supported on the side wallsand on three longitudinal rows of riveted steel columns have bottom flange angles seated on the con-crete floor and project half way through the roof slab, whichis specially reinforced above them by sets of horizontal J^ rods 6 ft. long and 4 ins. apart, distributing thecolumn reactions in the concrete. Just below the under side ofthe roof slab the columns are connected by continuous longi-tudinal girders, each composed of a pair of 12-in. channels,field-riveted to their bracket shelves. These channels are tiedtogether by horizontal bolts 12 ins. apart, which project about6 ins. beyond the channel webs on each side to engage a 2-in. xround-edged flat steel bar, and are screwed up against is concave, practically making inverts with a radius of about40 ft. Portland cement concrete, in proportions of i to 2^ to 5,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
