. Armour engineer. 77777777777, /2-//J Secf/or? tftrc?uc?fr G/rafer^ anc/ 37a t? Fig. 16. Cross Section of Erecting Girders. Jan. 1910] GREIFENHAGEN : EVANSTON TRACK ELEVATION 37 ers to the cars in each case by means of a special lowerlateral system which provided a pin plate to receive theking pin. Fig. 16 is a cross section of the girders and showsthe methods of supporting the slabs. Two pairs of 8xl6-inchneedle beams spaced 8 inches apart, and carrying a woodenblock with a hook, spanned the girders. Each end of the con-crete slab was suspended from a set of these beams (see ) by tackl
. Armour engineer. 77777777777, /2-//J Secf/or? tftrc?uc?fr G/rafer^ anc/ 37a t? Fig. 16. Cross Section of Erecting Girders. Jan. 1910] GREIFENHAGEN : EVANSTON TRACK ELEVATION 37 ers to the cars in each case by means of a special lowerlateral system which provided a pin plate to receive theking pin. Fig. 16 is a cross section of the girders and showsthe methods of supporting the slabs. Two pairs of 8xl6-inchneedle beams spaced 8 inches apart, and carrying a woodenblock with a hook, spanned the girders. Each end of the con-crete slab was suspended from a set of these beams (see ) by tackle made up of two 4-sheave blocks and 9 parts7s-inch diameter wire line. The company had two derrickcars, completely equipped with engine, rigging and tackle,which could be spared from other work. These cars were cou-. Fig. 17. View of Slab Erecting Train. pled to the train, one at each end, and the lines supportingthe two of the slab were controlled by the respectivederrick-car engineers. The procedure in placing the slab withthis device was as follows: The slab was jacked up and placedon girder carriages mounted on rails. After the erecting trainhad been properly placed, the girder carriage track was ex-tended across the main track, and the slabs were rolled under-neath the girders, connected, lifted, and carried to the bridgesite. The train was spotted in a position which would bringthe slab directly above its final bearings, the track was re-moved, the falsework was torn out, and the bridge seats were
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Keywords: ., bookcentury1900, bookdecade1910, bookidarmourengine, bookyear1910
