| 摘要 |
<p>A manhole base comprising a benching portion, an annular wall portion surrounding the benching portion and extending axially therefrom, the annular wall portion having inside and outside surfaces and at least two angularly spaced apart passages extending through the annular wall portion, each passage having inner and outer portions respectively, the inner and outer portions being disposed within the annular wall portion, the inner portions having respective inner openings in the inside surface and the outer portions having respective outer openings in the outer surface, the inner and outer openings being in communication with their respective passages. There is at least one canal in the benching portion for connecting at least two of the passages in communication with each other, the canal having an open top portion. There is also a canal liner having an open canal portion lying in the canal and having end portions lying in respective inner portions of respective passages, the end portions being in communication with the canal portion. The canal liner also has pipe connectors connected to respective end portions for connecting pipes to respective end portions of the canal liner, the pipe connectors having respective circular edges disposed between the inside and outside surfaces of the annular wall portion such that sufficient space is provided between the circular edges and the outer opening to permit installation of gaskets in the outer openings for sealing areas between connecting pipes connected to the pipe connectors and the manhole base such that in use, ground water is prevented from contacting the circular edges.</p> |
