Revision of the Niagara Railway Arch Bridge . Fig. 18.—New Sway and Vibration Fig. 19.—Copper-Steel Railway ProtectionTie Risers and Cover Strips. Floor, Showing REVISION OF NIAGARA RAILWAY ARCH BRIDGE 1981 The American approach was jacked up bodily 12 in., and cast-steelbases were inserted between the steel bases of the columns and themasonry. This jacking was done for all three of the American 48 ft. spans, during the two hours when the trains were of 12 by 12-in. timbers had been previously placed, and eight60-ton jacks on shores, two at each point,
Revision of the Niagara Railway Arch Bridge . Fig. 18.—New Sway and Vibration Fig. 19.—Copper-Steel Railway ProtectionTie Risers and Cover Strips. Floor, Showing REVISION OF NIAGARA RAILWAY ARCH BRIDGE 1981 The American approach was jacked up bodily 12 in., and cast-steelbases were inserted between the steel bases of the columns and themasonry. This jacking was done for all three of the American 48 ft. spans, during the two hours when the trains were of 12 by 12-in. timbers had been previously placed, and eight60-ton jacks on shores, two at each point, were used to raise the 300tons. The jacking began on a whistle signal, and all points were raisedand blocked 1 in. When all were abreast, a second signal was givenfor raising the second inch. Marks had been made to watch forcreeping, but none occurred. With the new castings and sheet lead inplace, the anchor-bolts were temporarily placed, the new north trackwas connected, and trains were allowed to cross. New Kailway Floor. The old railway deck had been placed originally with gal
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Keywords: ., bookcentury1900, bookdecade1920, bookidrevisionofni, bookyear1920
