JPS5681708A - Closing method of intake of conduit - Google Patents

Abstract

PURPOSE:To perform the titled closing and to perform a responsible outlet by a method wherein a caisson having gate sheet open upward and toward the surface facing a preparatory gate is fitted to a dam in a state wherein the surface facing the preparatory gate door is surrounded. CONSTITUTION:When a repair of the surface 11 facing the preparatory gate door is performed, the water outlet is performed through a conduit pipe 2 and a dam water level 38 is made to reach the lower end of a mouthpiece 7. Next thereto, a caisson 12 is lowered to a mouthpiece 7 position by means of a crane on a dam 1 and the caisson 12 is fixed to the dam in a water tight state. While retaining this state, a screen 9 for a preparatory gate is removed, and the repair of the surface 11 is performed from the side of an operation space 39 taking several days. In the mean time, a water level 38 rises, accordingly, a responsible water outlet is performed when operation is not performed at night. That is, a high pressure gate 4 and a preparatory gate 8 are made open and a main gate 6 is placed in a close state, and then, a dam water is run from the intake pipe of the caisson 12 to make the water level of the pipe 2 to be a level same as the level 38 and thereafter, while retaining the gate 13 in an open state, the gate 6 is opened to perform a responsible water outlet.