１前言日本国内的输水隧洞多建于１９００年初期至１９００年中期。从投入运用以来，已经过了半个多世纪，多数已经到了需要改建的时候。本文所述内衬钢板法改建马蹄形隧洞就是这种输水隧洞改建方法之一。这种方法，从１９８８年农林水产省北陆农政局作为信浓川左岸农田水... 1 Preface Japan’s domestic water tunnels built more in early 1900 to mid-1900. It has been more than half a century since it was put into operation, and most have reached the time of reconstruction. One of the ways to rebuild a horseshoe-shaped tunnel with the steel plate method described in this article is one of the methods for rebuilding the water conveyance tunnel. This method, from the Agriculture, Forestry and Fisheries in 1988 Hokuriku Bureau of Agriculture as the crest farmland water ...