. Armour engineer. consist of two abutments, two piers, andreinforced concrete deck slabs very similar in general arrange-ment to the subway bridges. The slabs between abutmentsand piers span the outside exit passages and the slabs betweenthe two piers span the station building. On account of lackof space and in order to make a neater job the piers for thetrack slabs were incorporated in the sidewalls of the stationbuildings. These piers were made long enough to take careof the slabs which would be required for the third track. AtDempster Street, where no supports were required for thepresent
. Armour engineer. consist of two abutments, two piers, andreinforced concrete deck slabs very similar in general arrange-ment to the subway bridges. The slabs between abutmentsand piers span the outside exit passages and the slabs betweenthe two piers span the station building. On account of lackof space and in order to make a neater job the piers for thetrack slabs were incorporated in the sidewalls of the stationbuildings. These piers were made long enough to take careof the slabs which would be required for the third track. AtDempster Street, where no supports were required for thepresent tracks, columns and footings for future use were, nev-ertheless, constructed within the walls of the buildings. Thereinforced concrete piers built within the station walls arevery similar in design to the piers for the subway bridges,consisting of a footing slab, footing girder, two columns pertrack and a top girder; the curved brackets are omitted, how-ever. The method of utilizing these piers in the construction. Jan. 1910] GREIFENHAGEN : EVANSTON TRACK ELEVATION 51 of the buildings is taken up under the head, Buildings. The subways are of the same general type of constructionas the standard reinforced concrete rectangular culverts builtby the Department. They consist of two sidewalks designedas slabs to support the lateral pressure of earth, resting onfootings of the required width necessary to provide sufficientbearing area, and spanned by reinforced concrete cover footings are carried down to the same level as the foun-dations for the surrounding work. Struts between the foot-ings take the horizontal reaction of the side walls. Four-inchprojecting ledges cast on the inside of the subway walls afforda support for the pavement or floor slab. The stairways are designed in various ways, dependingon the conditions, but in all cases they consist of a reinforcedstair slab spanning between two supporting walls. The stairslabs in the rear stairways rest on four-inch proje
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Keywords: ., bookcentury1900, bookdecade1910, bookidarmourengine, bookyear1910
