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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cortland Street Drawbridge ： ウィキペディア英語版 Cortland Street Drawbridge The Cortland Street Drawbridge (originally known as the Clybourn Place drawbridge) over the Chicago River is the original Chicago-style fixed-trunnion bascule bridge, designed by John Ericson and Edward Wilmann.〔 When it opened in 1902, on Chicago's north side, it was the first such bridge built in the United States. The bridge was a major advance in American movable bridge engineering, and was the prototype for over 50 additional bridges in Chicago alone.〔(【引用サイトリンク】 url=http://www.asce.org/People-and-Projects/Projects/Landmarks/Cortland-Street-Drawbridge/ )〕 The bridge was designated as an ASCE Civil Engineering Landmark in 1981, and a Chicago Landmark in 1991. ==Design== This is the bridge type for which Chicago engineers are most well-known. The trunnion bascule has two bridge leaves with pivots on the opposing riverbanks and are raised on large trunnion bearings by large counterweights which offset the weight of the leaves. They take their names from the French word ''Bascule'' meaning ''seesaw'' and the counterweights. Unlike most of the subsequent bascule bridges of Chicago, the gear rack that moves this bridge is visible above the roadway, on the curved arcs at each end of the superstructure. 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「Cortland Street Drawbridge」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.