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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 Manayunk Bridge ： ウィキペディア英語版 Manayunk Bridge The Manayunk Bridge (a.k.a. Manayunk Viaduct) is a historic bridge in Pennsylvania across the Schuylkill River and adjacent Schuylkill Canal between Bala Cynwyd, Montgomery County and the Manayunk neighborhood of Philadelphia. It is now used as an extension of the Cynwyd Heritage Trail to connect to the Schuylkill River Trail after a rail to trail conversion. ==History== Built by the former Schuylkill Valley Division of the Pennsylvania Railroad, it is a large concrete open spandrel arch bridge built on a reverse curve, earning both the current bridge and its 1883 wrought-iron-truss predecessor the nickname of "S-Bridge." The bridge's challenging geometry was executed by T. L. Eyre, a Philadelphia contractor. Another notable feature is the saw-toothed construction joints along a 65-degree skew. In 1976, SEPTA purchased the bridge for its Ivy Ridge Line (now Cynwyd Line. Ten years later, after weather-related expansion and contraction of the bridge, and the shedding of pieces of concrete due to spalling, SEPTA closed the bridge on October 25, 1986, truncating service at Cynwyd and suspended service to three of the line's six stations (Ivy Ridge, Manayunk, and Walnut Hill). Between 1996 and 1999, the bridge was stabilized and refurbished. The effort determined that the internal steel reinforcement was not compromised, as SEPTA had feared.〔 Further investigation by Urban Engineers determined that the bridge was safe and only needed surface work to stop the spalling.〔 Nevertheless, SEPTA did not restart train service to Ivy Ridge.〔 Instead, the agency repeatedly tried to terminate the remaining Cynwyd service due to its lower ridership. A small but active community-based ridership protest in 1997 convinced SEPTA not only to retain service to Cynwyd but to also expand service.〔 Still, SEPTA managed to decline to reopen the Manayunk Bridge and restore service to Ivy Ridge due to its operating expense. 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「Manayunk Bridge」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.