Public works . x-(avated to a depth of about 4 feet on a natural slopeand a new -1-4x85-foot cofferdam was built concentricwith the old one. Besides being sheeted, it was linedas the excavation progressed with horizontal 2-inchplanks bearing against outside rangers and againstinside vertical 1 i/2-inch round bars 4 feet apart,driven firmly into the river bottom and having theirupper ends secured by wire ties to the sheet piles inthe outer cofferdams. The excavation was thencompleted in the inner cofferdam. Pumps were pro-vided between the inner and outer cofferdams to 277 278 PUBLIC WORKS Vol.
Public works . x-(avated to a depth of about 4 feet on a natural slopeand a new -1-4x85-foot cofferdam was built concentricwith the old one. Besides being sheeted, it was linedas the excavation progressed with horizontal 2-inchplanks bearing against outside rangers and againstinside vertical 1 i/2-inch round bars 4 feet apart,driven firmly into the river bottom and having theirupper ends secured by wire ties to the sheet piles inthe outer cofferdams. The excavation was thencompleted in the inner cofferdam. Pumps were pro-vided between the inner and outer cofferdams to 277 278 PUBLIC WORKS Vol. 52, No. .6 pump from during the pier construction. After theconcreting had been completed, the vertical 1^-inchrods were pulled out and used for reinforcementsin the permanent structure. sheave and thence around it and at right angles tothe tracks to the second drum of the hoisting the river end of the first part of the hauling lineand of the land end of the other part there were U ^ n ri j^ -? k L. FALSEWORK BENT SUPPORTING STEEL ARCH CENTERS. GENERAL INSTALL.^TIONS The contractors plant and office were located onthe west bank of the river where concrete materials,reinforcements and other supplies were stored, shopsestablished and a concrete mixing and distributingplant installed. iMaterials were delivered on a rail-road siding 500 feet long, parallel and adjacent tothe west end of the bridge, and cars were switchedfrom this track to a parallel track by means of anendless hauling cable about 1,300 feet long, operatedby two drums of a 40 horsepower stationary hoist-ing engine set near the river bank. One part of thishauling cable was led around a guide sheave andrun 575 feet parallel to the two tracks, around twotail sheaves 21 feet apart, and back parallel withitself outside the second track, returning to a guide placed shackle attachments for snap chains by whichthe cars were hauled back and forth on the sidingor the other tracks, thus spotting them wherever re-qui
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
