Manhole seal construction

Details Manhole seal construction Manhole seal construction

E - Fixed Constructions

02

D

94/12

E02D 29/14 (2006.01) E02D 29/12 (2006.01)

Patent

CA 1230253

MANHOLE SEAL CONSTRUCTION Abstract of the Disclosure A manhole seal construction adapted to engage the outer surface of the manhole frame and the chimney to seal the corbel joint from the outside and prevent leakage of water and entry of foreign material into the joint and manhole. A resilient ring having a hook-like upper section is engaged with the outwardly extending flange on the manhole frame, and the ring has a thin, stretchable central section which extends across the corbel joint. The lower portion of the ring terminates in a lower section having a series of internal ribs that seal against the chimney and having an outer cir- cumferential groove to receive a clamping band. To provide additional sealing, an annular sealing gasket is bonded to the internal shoulder on the manhole frame and the manhole cover seats on the gasket to prevent leakage from the street into the manhole through the joint between the cover and the frame.

484912

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