초록 ▼

Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permable material occludin

Assemblies and methods are provided to divert liquids that would otherwise infiltrate utility manholes or other hatchways, while allowing gases to vent to the atmosphere. Preferred embodiments of the assemblies comprise a cover support frame, a sheet of water-repellent gas-permable material occluding the central opening of the support frame and a cover mated to the frame. Preferably, a stiffening ring or other means of providing structural rigidity to the venting structure is provided. The assemblies are lightweight and are simple to install, and can be fabricated from materials that are readily available. Moreover, the assemblies can be easily modified to accommodate field conditions.

대표청구항 ▼

1. An assembly for minimizing infiltration of liquid into a utility manhole while allowing gases to escape through said manhole, said assembly comprising:a manhole frame defining an access opening and comprising an integral flange within said access opening; a venting structure comprising a sheet of

1. An assembly for minimizing infiltration of liquid into a utility manhole while allowing gases to escape through said manhole, said assembly comprising:a manhole frame defining an access opening and comprising an integral flange within said access opening; a venting structure comprising a sheet of liquid-repellent gas-permeable material, said venting structure occluding said access opening and forming a substantially liquid-tight seal with said manhole frame; and a manhole cover having a vertically-oriented rim, said manhole cover being mated to said manhole frame so that said manhole cover substantially covers said access opening when said manhole cover rests on said integral flange.