| 摘要 |
<p>A containment manhole is disclosed for containing spills at or about the upper end of a fill pipe leading to an underground product storage tank. The containment manhole includes a hollow body comprising enclosing sidewalls, the sidewalls terminating upwardly in circular top and downwardly in a circular bottom. An annular upper ring of a particularly recited structure is secured to the circular top in a leak-proof interconnection. A bottom plate is secured to the hollow body at the circular bottom in a leak-proof circular junction, the bottom plate being provided with an opening to receive the upper end of the fill pipe therein. A circular cover of a particularly recited structure is removably supported over the hollow body upon the upper ring. A first seal is secured upon the second ledge and substantially covers the second ledge, a portion of the bottom flange of the cover contacting and sealing against the first seal means to prevent leakage between the cover and the annular upper ring. A second seal is secured upon the bottom plate about the opening and in contact with the fill pipe to prevent the leakage of product therebetween, the second seal being capable of permitting limited relative movement between the fill pipe and the manhole bottom while sealing. Finally, a resilient gasket is positioned within the cover circular groove, the gasket contacting the inner vertical surface of the upper ring additionally to prevent leakage between the cover and the annular upper ring.</p> |
