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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 Conwy Railway Bridge ： ウィキペディア英語版 Conwy Railway Bridge The Conwy Railway Bridge carries the North Wales coast railway line across the River Conwy between Llandudno Junction and the town of Conwy. The wrought iron tubular bridge, which is now Grade I listed, was built in the 19th century by Robert Stephenson. It is the last surviving example of this type of design by Stephenson after the Britannia Bridge across the Menai Strait was destroyed in a fire in the 1970s. ==History== The bridge was constructed to carry the Chester and Holyhead Railway across the River Conwy. Robert Stephenson, in collaboration with William Fairbairn and Eaton Hodgkinson, provided the engineering plans. Originally it was intended to be a suspension bridge; complimenting the 1826 Conwy Suspension Bridge by Thomas Telford. However after Stephenson was appointed chief engineer, the design changed because he had become a pioneer of wrought-iron box-girder construction (like the Britannia Bridge spanning the Menai Strait). The project's architect was Francis Thompson who designed the bridge with stone crenellated turrets, arrow slits and bartizans in order to compliment its location next to Conwy Castle, an Edwardian fortification that had stood on the promontory since the late 13th century. The bridge contractor was a William Evans. Construction began in 1846. The ironwork was constructed by Easton & Amos. Steam-powered hydraulic engines were used to lift the wrought iron girders and beams into place from barges moored in the river. The bridge was officially opened in 1849 although it had been completed in 1848. As the first tubular crossing to be built, Stephenson wanted to confirm through testing that the structure would be capable of carrying the weight of a locomotive and its rolling stock. The testing was performed by Fairbairn. The successful results endorsed the construction of the Britannia bridge. In 1899 the tubular sections were reinforced with additional cast iron columns to reduce the load on the span across 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「Conwy Railway 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.