. The Street railway journal . ET RAILWAY JOURNAL. [Vol. XXL No. i6. tract has been let to the E. D. Smith Construction Company,and active work will be immediately commenced. Besides the subway proper, which is essentially a four-trackconcrete lined tunnel built in open trench, it will include anunderground station, chambers, ducts and mechanical apparatusfor drainage and ventilation systems, fire-pipe line service,electric ducts, the maintenance of traffic and of existing adja-cent structures and the reconstruction of sewers and drains. O 8 15 24 pipe separators. These girders are filled with
. The Street railway journal . ET RAILWAY JOURNAL. [Vol. XXL No. i6. tract has been let to the E. D. Smith Construction Company,and active work will be immediately commenced. Besides the subway proper, which is essentially a four-trackconcrete lined tunnel built in open trench, it will include anunderground station, chambers, ducts and mechanical apparatusfor drainage and ventilation systems, fire-pipe line service,electric ducts, the maintenance of traffic and of existing adja-cent structures and the reconstruction of sewers and drains. O 8 15 24 pipe separators. These girders are filled with concrete andconcrete is moulded around them to form solid reinforcedbeams integral with the roof slab. Bents are 5 ft. apart, and the columns are connected trans-versely by pairs of i^-in. horizontal adjustment rods. Thelower ends of the columns are enclosed in solid concrete bulk-head walls, 6>4 ft. long and 3>4 ft. high above the rail base,alternating with openings y/2 ft. long. These bulkheads are ■■ Shpz 2in Sect ion Z-Z. Pip& Ducf- StS Section V-V. Section U-U. ^ CROSS SECTION OF UNDERGROUND STATION AT NINETEENTH STREET 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
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
