Manhole construction

Details Manhole construction Manhole construction

E - Fixed Constructions

02

D

94/12

E02D 29/14 (2006.01)

Patent

CA 1133739

MANHOLE CONSTRUCTION Abstract of the Disclosure A liquid-tight manhole closure structure includ- ing a base frame having a manhole opening therein, a manhole cover for placement in the manhole opening, and a retainer ring for detachably securing the cover on the frame. The retainer ring and frame have peripheral coacting, detachably interlocking, cam surfaces for re- movably securing the ring to the frame. A resilient sealant is disposed between the cover and the frame to prevent liquid seepage through the manhole opening. The sealant may be vulcanized or otherwise secured directly to the periphery of the cover and/or to the frame.

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