초록 ▼

Manhole sealing device to prevent water from entering a manhole through the corbel joint between the manhole casing and cover frame. The device comprises a flexible tube like membrane spanning the corbel joint of the manhole and provided with first sealing means above the corbel joint to seal the me

Manhole sealing device to prevent water from entering a manhole through the corbel joint between the manhole casing and cover frame. The device comprises a flexible tube like membrane spanning the corbel joint of the manhole and provided with first sealing means above the corbel joint to seal the membrane against the inside wall of the cover frame and second sealing means below the corbel joint to seal the flexible membrane against the inside wall of the manhole casing. The portion of the membrane between the first and second sealing means is preferably provided with enough slack to form a inward fold defining an annular pocket to contain any water or other fluids entering the manhole through the corbel joint thereof. In a preferred mode of the present invention the membrane is a bag with a closed bottom to catch any water entering the manhole through or around the manhole cover. The manhole sealing device can be installed in an existing manhole without replacing any of the structural parts thereof.

대표청구항 ▼

A manhole sealing device, comprising: A. a flexible membrane for spanning the corbel joint between the cover frame and casing of said manhole, said membrane comprising a tube of flexible waterproof sheet material having generally cylindrical top and bottom portions; B. means for forming a substantia

A manhole sealing device, comprising: A. a flexible membrane for spanning the corbel joint between the cover frame and casing of said manhole, said membrane comprising a tube of flexible waterproof sheet material having generally cylindrical top and bottom portions; B. means for forming a substantially continuous first seal between said membrane and an inside wall of said manhole cover frame, comprising a radially expandable brace for urging said membrane top portion against said cover frame inside wall; C. means for forming a substantially continuous second seal between said membrane and an inside wall of said manhole casing, comprising a radially expandable brace for urging said membrane bottom portion against said casing inside wall; wherein said membrane has a greater axial length than the distance between the portions of said casing and cover frame inside walls for forming said first and second seals when said device is installed, whereby to cause formation of a radially inward fold in the portion of said membrane between said first and second seals when said device is installed.