|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||404/72 ; 52/21 ; 210/163 ; 404/26|
|발명자 / 주소|
|인용정보||피인용 횟수 : 9 인용 특허 : 1|
A process for raising manholes and manhole covers to a new grade level of a street when constructing new streets or when paving old streets, comprising the steps of placing a sealing means around the interior of the cast manhole between the lower edge thereof and the upper edge of a sewer catch basin, and pouring wet concrete around the exterior of manhole, the sealing means, and the upper edge of the sewer catch basin to form a continuous joint between the manhole at the raised grade level and the upper edge of the sewer catch basin, and removing the se...
A process for supporting a manhole frame and obtaining a seal between a manhole frame and a sewer catch basin, comprising the steps of: a. positioning a manhole frame in a desired position relative to an opening in a sewer catch basin; b. placing a flexible, resilient, air tight expandable means within the interior opening oF the manhole frame and catch basin opening against the inner surfaces of said manhole frame and said sewer catch basin opening; c. inflating said expandable means to expand said expandable means into contact with the inner surfaces o...