초록 ▼

A rehabilitated manhole cover and method of producing the same. To rehabilitate the manhole cover for a sanitary sewer system, a removable plug is inserted in one of the vent holes in the cover, while a permanent seal is applied to the remaining vent holes. A pneumatic gasket is installed with an ad

A rehabilitated manhole cover and method of producing the same. To rehabilitate the manhole cover for a sanitary sewer system, a removable plug is inserted in one of the vent holes in the cover, while a permanent seal is applied to the remaining vent holes. A pneumatic gasket is installed with an adhesive on the annular ledge in the manhole casting and the cover when installed rests on the ledge and compresses the gasket to provide a seal between the cover and the casting. To properly center the cover, holes are drilled in the peripheral edge of the cover and metal rivets installed within the holes. Each rivet is provided with an enlarged head which projects outwardly from the cover and can be spaced from the peripheral edge of the cover by shims or spacers to thereby maintain the peripheral edge of the cover is close proximity to the manhole casting. By removing the removable plug the cover can be removed from the manhole in a conventional manner by using a pick.

대표청구항 ▼

A manhole assembly, comprising a manhole casting defining a manhole and having an internal shoulder spaced from the upper edge of the casting, a cover to enclose the manhole and supported on said shoulder, a gasket disposed to seal the joint between the cover and the casting, a peripheral edge of sa

A manhole assembly, comprising a manhole casting defining a manhole and having an internal shoulder spaced from the upper edge of the casting, a cover to enclose the manhole and supported on said shoulder, a gasket disposed to seal the joint between the cover and the casting, a peripheral edge of said cover having a plurality of generally radial circumferentially spaced holes, and a spacing member disposed in each hole and projecting radially outward of the cover, each spacing member having an enlarged head terminating in a relative flat outer surface, said spacing members serving to accurately center the cover within said manhole.