The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2002
Filed:
Dec. 14, 1999
Takao Kamiyama, Hiratsuka, JP;
Yasuhiro Yokoshima, Ibaraki-ken, JP;
Shigeru Endoh, Yasato-machi, JP;
Hiroyuki Aoki, Tokorozawa, JP;
Other;
Abstract
A liner bag for a manhole can have an improved durability after hardening with a fluid pressure barrier film left on the inner wall of a lined manhole, and a method of lining a manhole using the liner bag is capable of realizing a reduction in the number of steps involved in a manhole lining process to reduce a working time and a working cost. The liner bag for a manhole has an outer-layer liner bag including a first bag-shaped resin absorbent material, and an unhardened liquid hardenable resin impregnated in the first bag-shaped resin absorbent material, and an inner-layer liner bag including a second bag-shaped resin absorbent material, a highly air-tight plastic film coated over an inner surface of the second bag-shaped resin absorbent material, and an unhardened liquid hardenable resin impregnated in the second bag-shaped resin absorbent material, wherein the inner-layer liner bag has a thickness smaller than the outer-layer liner bag, and the inner-layer liner bag being inserted in the outer-layer liner bag. With the liner bag thus configure, since the manhole lining method performed using the manhole liner bag eliminates the necessity of stripping off the plastic film functioning as a fluid pressure barrier liner from the hardened liner bag and wasting the same, as before, it is possible to realize a reduction in the number of steps involved in the lining process, a working term, and a working cost.