. The Street railway journal . sustaining a load per pileof 30 tons, made the areas of the footings about two-thirds thesize necessary for wood piles, thus making it possible to constructthe conduits between the footings, excavating below the basementfloor only to the depth necessary for the concrete pile capping andthe column bases. For these piles a tapering sheet-steel casing,in which is a collapsible core, is driven through the mud to hard and walls, are entirely of reinforced concrete, as are the coal bunk-ers and stacks. Concrete for the bunkers was considered cheaperthan any other const
. The Street railway journal . sustaining a load per pileof 30 tons, made the areas of the footings about two-thirds thesize necessary for wood piles, thus making it possible to constructthe conduits between the footings, excavating below the basementfloor only to the depth necessary for the concrete pile capping andthe column bases. For these piles a tapering sheet-steel casing,in which is a collapsible core, is driven through the mud to hard and walls, are entirely of reinforced concrete, as are the coal bunk-ers and stacks. Concrete for the bunkers was considered cheaperthan any other construction, because of its requiring practically noexpenditure for maintenance or repairs. To economize space, the stacks were located over the boilersand supported on the structural steel work at a point 50 ft. abovethe boiler room floor, finishing 1 75 ft. above this point, the diame-ter being 1 4 ft. inside. Reinforced concrete stacks were adoptedbecause of economy in construction and maintenance and light- North Party Line *. Street ltv. Journal PLAN OF FIRST SECTION OF TURBINE ROOM AND BOILER ROOM AT NEW DELAWARE AVENUE POWER HOUSE sand; the core is then withdrawn and the shell filled with con-crete. The water conduits are square in section, the walls being of re-inforced concrete. The superstructure is supported on a skeletonsteel construction, the columns having combination steel I-beamgrillage and reinforced concrete footings, each column supportedon an independent group of piles. The walls are of red brickwith terra cotta cornice. The window frames are of metal glazedwith wire glass. The main floor and the gallery floors in the engine room are ofreinforced concrete slabs, between the steel beams, in which areembedded the pipes for the cables. The entire boiler room floor, with the cinder chambers and gal-lery below and the piers and girders supporting the boiler columns ness, each stack weighing about 500 tons. They are supportedon double-plate girders, between which are
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
