TEMPORARY COFFERING FACILITY FOR REPAIRING FLOOD SPILLWAY GATE OF DAM BODY

摘要

PROBLEM TO BE SOLVED: To provide a temporary coffering facility for repairing a flood spillway gate of a dam body that satisfactorily performs damming-up function at a time of normal water level, conducts water safely and securely at a time of flood, and offers high workability and economic efficiency.SOLUTION: A temporary coffering facility 25 is for reforming a flood spillway gate of a dam body 30. A damming-up mechanism comprises a rotatable door body 5 supported by a flexible hinge sheet 7 on a top surface of a foundation base 38, and flexible bag bodies 12 (A,B) installed on a downstream side of the door body 5. A flap gate 3 is configured such that when the bag bodies 12 (A,B) expand, a top part of the door body 5 is rotated to an erected position U at a height almost equivalent to a top part of a flood spillway gate 31, and when the bag bodies 12 (A,B) contract, a front surface of the door body 5 is rotated to a falling position D at a height almost equivalent to a bottom part of the flood spillway gate 31.SELECTED DRAWING: Figure 2