A CONTRAST STUDY ON PROJECT COST OF KINTAI BRIDGE AND OTHER TIMBER BRIDGES IN THE MIDDLE-LATE EDO PERIOD

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  • NIN Sousou
    Grad. Stud., Dept. of Architecture, Faculty of Engineering, the University of Tokyo
  • KOSHIHARA Mikio
    Prof., Institute of Industrial Science, the University of Tokyo, Dr. Eng.

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Other Title
  • 錦帯橋の建設費用に関する研究
  • 錦帯橋の建設費用に関する研究 : 江戸期における木造橋との比較
  • キンタイバシ ノ ケンセツ ヒヨウ ニ カンスル ケンキュウ : エドキ ニ オケル モクゾウバシ ト ノ ヒカク
  • －江戸期における木造橋との比較－

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Abstract

 Kintai bridge is a five-span wooden arch bridge first constructed in the year 1673. During the past 340 years it has been constantly repaired and rebuilt nevertheless its form has been maintained properly. Consisting of two spans of girder bridges on both ends and three span arch bridges in the middle, it is considered to be the only wooden arch bridge of its kind not only in Japan but also in the world. To understand how it was designed and its value in the history of architecture we should know other bridges' features as well as their construction technique at the time. By studying the historical document about bridges' construction, we have compared the cost of construction in details between Kintai bridge and other wooden bridges. We found out that by using standard small section timber pieces a retrenchment in timber cost as well as the wood processing expenditure could be achieved. Also the use of large amount of metal components may also be conjectured as a way to reduce cost by reusing them on several reconstruction before they have to be replaced.

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