STEEL REVETMENT STRUCTURE USED FOR FISH NEST IN COMMON

摘要

PROBLEM TO BE SOLVED: To provide a steel revetment structure used for a fish nest to protect fish against flood for instance by forming a shelter space. SOLUTION: The steel revetment structure is provided with a rear structure 14 filled with stones 13 in the inside of a steel cubic frame 12 constituted by connection of columnar members 21, 22 in the forward and backward sides, vertical depthward beams 23, 24, vertical rearward beams, diagonals 33, screen members, etc., and a hollow structure 15 for nest for fish assembled by steel frames adjacently connected to the front face of the stone-filled structure 14, and the front face of the hollow structure 15 for fish nest is formed of a screen 16 having clearances 16a which can block a stone and gravel stream even when these stones and gravels come down together with water when flood and debris flow arises, but have clearances 16a through which fish can pass. 43 is columnar members for fish nest and 15 is gap-forming members. In a flood or a debris flow, the debris gravels flow down together with water but the screen 16 of the frontage of the hollow structure 15 for fish nest blocks out intrusion of these gravels and fish can escape in the safe inside space S of the hollow structure 15. Hence, fish can be prevented from being damaged by gravels and hence fish can be safely protected.