File:Armour engineer (1910) (14781514021).jpg

Identifier: armourengineer02armo (find matches)
Title: Armour engineer
Year: 1910 (1910s)
Authors: Armour Institute of Technology
Subjects:
Publisher: Chicago : Armour Institute of Technology
Contributing Library: Paul V. Galvin Library, Illinois Institute of Technology
Digitizing Sponsor: CARLI: Consortium of Academic and Research Libraries in Illinois

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alls of thenorth abutment by means of an arch opening of 7 feet in width.Four spandrel walls, two on the outside and two intermediateones, are built directly on the arch ring. The outer spandrelssupport the cornice, railing, pedestals, and the outer edge ofthe sidewalks. The combined gutter and curbs, and the inneredge of the walks, rest on the intermediate spandrels. Permission to use the ground to the east of the bridgecould not be obtained, so that the contractors plant wassqueezed between the new bridge and the temporary bridge.They erected two derricks with 60-foot booms just to the west ♦Class 1905. Assistant Engineer, Bridge Department, City of Chicago. 100 THE ARMOUR ENGINEER (Vol. 2, No. 1 of the bridge. These derricks could reach practically everycorner of the job. On a deck scow, tied up between the der-ricks, a yard mixer of the Smith type was set up. Runwaysfrom this platform to the shore gave access to the sand andgravel piles on the north approach. The cement shed was
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Fig. 1. View of Piles and Bents Showing Arrangement. erected on the north end and was also connected with the mix-er by a runway. With the excavated material dumped at eachend of the bridge the contractors were very often in crampedquarters. Jan. 1910) PENN: CONCRETE ARCH BRIDGE 101 Along the east side of the bridge and 18 inches from itsface are the two overflow outlets of the Kedzie Avenue sewer.These outlets are connected by an inverted siphon five feet* indiameter under the Illinois and Michigan Canal. The soil in this locality is a blue clay mingled with a greatdeal of fine sand. As long as the stuff remains dry it is com-paratively easy digging, i. e., with dynamite, pick and shovel.Excavation was started on the north side, being carried outto the neat line of concrete. Some of the dirt was dumped onthe canal face to keep out the water of the canal. Whenexcavation had been carried to an elevation below the siphon

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