| 摘要 |
PROBLEM TO BE SOLVED: To provide an invert of a manhole, which can be easily constructed without using an individually required frame and has excellent performance in terms of tractional properties, corrosion resistance, etc. SOLUTION: The invert 10 installed on a bottom 2 of the manhole 1 is characterized as follows: a concave part of the invert 10 is formed of a pipe body piece 3 having a shape corresponding to a shape of an inner surface of a sewer pipe 11 connected with the manhole 1; one end surface of the piece 3 is closed with a joint stopping plate 4 having a notched hole 5 housing an effluent pipe 15 of a vertical pipe 12 provided inside the manhole 1; and outer peripheries of the piece 3 and the plate 4 are fixed by concrete 9.
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