| 摘要 |
PROBLEM TO BE SOLVED: To provide a corridor in a valve box, easy in carrying-in and installation from a manhole, and allowing a worker to safely walk on the periphery of a condenser backwash valve. SOLUTION: A corridor solid is carried in a circulating pipe from the pipe manhole, and is laid in a plurality all over on a valve box bottom surface of the condenser backwash valve crossing with the circulating water pipe, and is used when the worker moves in the valve box of the condenser backwash valve. An upper surface part 20 of the corridor solid is formed in a plane shape, and a curved surface part with curvature of the valve box bottom surface as a reference, is formed in a bottom surface part 19 contacting with the valve box bottom surface of the condenser backwash valve on the opposite side of the upper surface part 20. The height H up to the upper surface part 20 from the bottom surface part 19 is also formed so as to become the substantially same height as the height on the inlet side of the circulating water pipe from the valve box bottom surface of the condenser backwash valve, and is formed in the size capable of carrying in from the pipe manhole. COPYRIGHT: (C)2009,JPO&INPIT
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