초록 ▼

A watertight manhole insert which is characterized by a dish-shaped seal or stopper designed to prevent rainwater from entering a sanitary sewer system through a manhole closed by a manhole cover. The manhole insert is located beneath the manhole cover and serves to plug the manhole and prevent floo

A watertight manhole insert which is characterized by a dish-shaped seal or stopper designed to prevent rainwater from entering a sanitary sewer system through a manhole closed by a manhole cover. The manhole insert is located beneath the manhole cover and serves to plug the manhole and prevent flooding of the underlying sewer system. The manhole insert is characterized by a dish-shaped bowl having a pressure-relief valve, an optional vacuum relief valve and left strap and a substantially perpendicular, upward-standing side wall fitted with an outwardly-extending top rim for engaging a shoulder shaped in a manhole to support the manhole insert. Multiple, upward-standing bottom ribs radiate from the side wall inwardly in the curved bowl bottom toward the pressure relief valve, which is normally located in the center of the manhole insert, in order to stiffen the bowl-shaped bottom. Optional side ribs may also be provided in the vertical side wall for stiffening purposes. In a preferred embodiment the rim is sandwiched between two parallel elements of a ribbed rubber seal which is locked into the rim, the top of which seal receives the manhole cover and the bottom of which includes spaced seal ribs which engage the manhole shoulder and act as water barriers.

대표청구항 ▼

A manhole insert for location in a manhole beneath a manhole cover, said manhole insert comprising a dish-shaped body having a curved bottom terminated by an upward-standing side wall; at least one bottom rib provided in said bottom for strengthening said bottom; a pressure relief valve provided in

A manhole insert for location in a manhole beneath a manhole cover, said manhole insert comprising a dish-shaped body having a curved bottom terminated by an upward-standing side wall; at least one bottom rib provided in said bottom for strengthening said bottom; a pressure relief valve provided in said bottom for releasing pressure in the manhole; and a rim shaped in the top edge of said side wall for supporting said manhole insert in the manhole.