Patent ID: 6401759
Filing Date: 2002-06-11
Classification: B29C,E02D,F16L

Abstract:
A liner bag for a manhole comprising:an outer-layer liner bag including a first bag-shaped resin absorbent material, and an unhardened liquid hardenable resin impregnated in said 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 said second bag-shaped resin absorbent material, and an unhardened liquid hardenable resin impregnated in said second bag-shaped resin absorbent material, said inner-layer liner bag having a thickness smaller than said outer-layer liner bag, said inner-layer liner bag being inserted in said outer-layer liner bag.