Maintenance method and intake / discharge port in the intake / discharge tunnel

摘要

To provide a maintenance method of an inside of a water intake and discharge channel tunnel and a water intake and discharge port in which inspection and repair of entire area of the water intake and discharge channel tunnel can be easily performed in a drying-up state.SOLUTION: In a water discharge channel tunnel 21 connected to a water discharge port 1 including a top slab 3, a bottom slab 5 and a side wall 7, a cover 11 is removed from a top slab opening 29 of the top slab 3, is lifted down to a bottom slab opening 31 provided in the bottom slab 5 so as to communicate with the water discharge channel tunnel 21, and closes the bottom slab opening 31. Then, while supplying air into an air supply and exhaust port 13 of the cover 11 via an air supply and exhaust pipe 15 from the water surface, water in the inside of the water discharge channel tunnel 21 is drained, and maintenance of the inside of the water discharge channel tunnel 21 is performed. While exhausting air from the air supply and exhaust port 13 of the cover 11 via the air supply and exhaust pipe 15 to the water surface, water is injected into the inside of the water discharge channel tunnel 21. Then, the cover 11 is removed from the bottom slab opening 31, is lifted up to the top slab opening 29, and closes the top slab opening 29.SELECTED DRAWING: Figure 1