Engineering and Contracting . .C, <3=\A/ .jy. Trcfcks , Traces Soinf ^ : StRRy Fig. 1. Map Showing Location of Milwaukee Ave. and Desplaines St. Viaducts, Chicago. Vlay 6, 1914. Engineering and Contracting 527 s no record of the specifications and load-ng for which they were designed, but dur-ng the last few years of their life various)arts of the structures were overstressed quiring less expense for maintenance. It wastherefore decided to build eight reinforcedconcrete spans on the north end of each struc-ture, with a truss and a plate gi
Engineering and Contracting . .C, <3=\A/ .jy. Trcfcks , Traces Soinf ^ : StRRy Fig. 1. Map Showing Location of Milwaukee Ave. and Desplaines St. Viaducts, Chicago. Vlay 6, 1914. Engineering and Contracting 527 s no record of the specifications and load-ng for which they were designed, but dur-ng the last few years of their life various)arts of the structures were overstressed quiring less expense for maintenance. It wastherefore decided to build eight reinforcedconcrete spans on the north end of each struc-ture, with a truss and a plate girder span on. rig. 2. Plan, Elevations and Cross-Sections of Typical Panels of Milwaukee Ave. Via-duct. ,riorc than 100 per cent under traffic. This the south end of the Milwaukee .\ve. viaductondition was remedied by the decision to re- and three plate girder spans on the south end?lace these bridges with new structures de- of the Desplaines St. viaduct, the latter re-igned under the city specifications, the load- quiring longer spans than could be made of 3-35-0 Spans (Average of the footings a 1:3:() was used. Testsof the concrete at 28 days showed a com-pressive strength for cylinders 8 ins. indiameter by 16 ins. long of 2,500 lbs. per squareinch for 1:4 concrete, and of 2,000 lbs. persquare inch for 1 :2:4 concrete. The cementgun was used for pointing after the formswere removed. In designing the reinforced concrete spansit was necessary to meet three rather unusualrequirements. The first of these requirementswas that the new bridges should carry theheaviest city traffic, with a floor d
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