US 2025/0369221 A1 · MANHOLE COVER SEAL

Abstract

A manhole sealing device to prevent environmental water from entering a manhole through the joint between the manhole casing, manhole cover, and cover frame. The device comprises a disc shaped inflatable seal for insertion into the upper portion of the manhole and inflated to provide a sealing means to prevent infiltration of water from the environment to the interior of the manhole. The disc shaped seal may include a first rigid stabilization portion surrounded by a flexible inflatable seal wherein the stabilization portion supports and assists in maintaining a seal to prevent water or other fluids from entering the manhole through the cover or the corbel joint thereof. The manhole sealing device can be installed in an existing manhole without replacing any of the structural parts thereof.

Claims12

Dependent claims

A manhole cover seal, comprising:

an upwardly dish shaped hollow body having a cavity therein, a flange forming a rim on said body, and at least one stiffening rib in said rim;
an expandable bladder, received in said flange, said expandable bladder in fluid communication with said cavity within said body, wherein said expandable bladder forms a watertight seal against a manhole frame when inflated;
and
a fill valve in fluid communication with said cavity;
and
a drain hole positioned within said body to allow for controlled removal of accumulated water from the top of the seal, said drain hole including a gravity-based drain plug,
wherein fluid entering said fill valve causes said expandable bladder to expand to seal said manhole.

4 more elements

Dependencies are inferred from the claim text.

Manhole cover seal

Life of this patent

Manhole cover seal

Life of this patent

Abstract

Claims12