STUDY OF THE SECOND STONE ARCH BRIDGE OF THE FIRST ARTERIAL WATERWAY OF THE MEISEI IRRIGATION CANAL —INVERTED SIPHON MADE OF IRON PIPES ON THE STONE ARCH BRIDGE AND GIICHI YAJIMA—

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  • 明正井路一号幹線第二拱石橋に関する一考察 ―鉄管逆サイフォン石造アーチ水路橋と矢島義一―
  • STUDY OF THE SECOND STONE ARCH BRIDGE OF THE FIRST ARTERIAL WATERWAY OF THE MEISEI IRRIGATION CANAL —INVERTED SIPHON MADE OF IRON PIPES ON THE STONE ARCH BRIDGE AND GIICHI YAJIMA—

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Most stone arch bridges in Japan are located in Kyushu. These bridges were universally constructed as social infrastructures from the early Showa era to the end of the Edo era. In many cases, certain information on Japanese arch bridges such as the construction year, the name of the architect, and the design drawings are missing. Therefore, a re-examination and re-evaluation of these stone arch bridges are necessary.<br> For this reason, this paper studied the second stone arch bridge of the first arterial waterway of the Meisei irrigation canal. It was recognized that this bridge was actually made up of a pair of structures; an iron pipe reverse siphon and a stone arch bridge. In fact, an aqueduct bridge of this form is incredibly rare even in the whole country. Additionally, it is the oldest aqueduct stone arch bridge that is still active today. The designer of Giichi Yajima was a young engineer who studied the readjustment of arable land at the then state-of-the-art Koshu school. The second stone arch bridge of the first arterial waterway of the Meisei irrigation canal and the Misaka siphon in Hyogo have some similarities. For example, they are both a combination of a stone arch bridge and an iron pipe siphon. Furthermore, the siphons in both cases are constructed out of a soft iron material.

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