A type of river regulating structure. Unique to Japan, its origins can be traced back to the Nara period. Basically, it is made by arranging pile-like members into a triangular or square pyramid shape, and is named after its shape, which looks as if it has two horns. There are many types, such as the ushiwaku, seigyū (also called hijiriushi), and inoko (illustration). They are mainly installed in alluvial fan rivers where the riverbed is made of gravel or stones, making it difficult to drive piles into the ground. To prevent the river from being washed away, they use weights such as long, woven bamboo or iron wire baskets filled with stones (called gabion). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
河川における水制の一種。日本独特のもので,その起源は奈良時代にさかのぼることができる。基本的には,杭状の部材を三角錐あるいは方錐体状に組んだもので,その形があたかも2本の角をもっているように見えることからこの名がある。牛枠,聖牛(せいぎゆう)(ひじりうしとも),猪子(いのこ)など多数の種類がある(図)。河床が砂利や石などから成り,杭などを打ち込むことがむずかしい扇状地河川に主として設置され,流されるのを防ぐため,竹や鉄線で細長く編んだ籠に石をつめたもの(蛇籠という)などを重石として用いる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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