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Canal Street railroad bridge : ウィキペディア英語版 | Canal Street railroad bridge
The Canal Street railroad bridge (or Pennsylvania Railroad bridge) is a vertical-lift bridge across the south branch of the Chicago River in Chicago, Illinois. It was designated a Chicago Landmark on December 12, 2007. ==Construction== The present bridge was constructed for the Pennsylvania Railroad to replace a two-track swing bridge at the same location. The necessity to allow both continued use of the swing bridge and unimpeded river traffic during building work complicated construction of the bridge. The chosen solution was to construct the bridge in the raised position above the old bridge, then demolish the old bridge once construction was completed. The bridge was designed by Waddell & Harrington, and fabricated and erected by the Pennsylvania Steel Company.〔 Construction of the south tower began on September 4, 1913. When the two towers were completed, falsework for the main span was constructed in a fan shape that allowed the main span to be constructed in the raised position above the river.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Canal Street railroad bridge」の詳細全文を読む
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