Pipes and tubular conduits – Flexible – Braided – interlaced – knitted or woven
Patent
1986-08-15
1988-02-09
Bell, James J.
Pipes and tubular conduits
Flexible
Braided, interlaced, knitted or woven
138 97, 138 98, 138119, 138125, 138128, 138145, 428 36, 428137, 428138, 428192, F16L 1100
Patent
active
047235799
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lining material for pipe lines, chiefly those buried in the ground, such as gas conduits, city water pipe lines, wage pipes, construction pipe lines like power transmission wires or telecommunication cables, oil pipe lines, etc. More particularly, the present invention relates to a lining material for the above described pipe lines which comprises an air-impervious tubular fabric provided on the external surface thereof with a film of a synthetic resin and capable of being inserted under evagination into the pipe lines, the tubular fabric having been provided on the inner surface thereof with a non-woven fabric having a specific structure, and thus possesses earthquake-resistance and shape-maintaining property against external hydraulic pressure in addition to the various properties required for conventional lining materials.
BACKGROUND ART
In recent years,the application of a lining material onto the surface of the above described pipe lines buried in the ground is carried out for the purpose of repair and reinforcement of the pipe lines when superannuated. One of the lining method is carried out in such manner that a lining material in the form of a tube is provided on the inner surface thereof with a binder and the lining material is inserted into a pipe line and allowed to advance therein while turning the lining material inside out under fluid pressure whereby the lining material is bonded onto the inner surface of the pipe line with the binder being interposed between the lining material and the pipe line (see, for example, U.S. Pat. Nos. 4,368,091 and 4,334,943 and Japanese Patent Publn. Nos. Sho. 58-38088, 58-51654 and 59-12911). This method need not dig up a pipe line over its full length and is operable simply by forming manholes at both terminal ends of the pipe line to be lined. The lining work itself can be done within a short period of time for a long pipe line and is operable for a pipe line having a number of bends, thus being regarded as an excellent method.
On the other hand, various kinds of lining materials have been proposed as the lining material for the lining method of this type, including a thin flexible plastic tube, a textile lining material which comprises a woven or non-woven fabric in the form of a tube provided on the exterior surface with an air-or water-impervious coating, etc.
In Japanese Patent Publn. No. Sho. 55-43890 (British Patent No. 1,449,455), for example, there is disclosed a lining material which is composed of a flexible resin-absorbing material comprising felt and/or fabric and a flexible foamed agent and having an impervious film coated thereon. Japanese Patent Publn. No. Sho. 58-33098 discloses a lining material manufactured from a flat web laminate comprised of resin-absorbing layers with an impervious layer on one side thereof, the both ends of which have been sewn with a thread to form a tubular shape having the impervious layer on the external surface, the sewn area being fully covered with a sealing ribbon or a coating as well as a method for manufacturing the lining material. U.S. Pat. Nos. 4,334,943 and 4,368,091 disclose a lining material comprising a textile jacket made of warps and a weft woven in a tubular form and overlaid with a resin. Further, Japanese Laid-open Utility Model Appln. No. Sho. 56-3619 discloses a lining material comprised of a similar tubular textile jacket having a flexible rubbery or plastic coat on the exterior surface thereof. In Japanese Laid-open Patent Appln. No. Sho. 56-8229 aiming at an improvement of the above lining material for pipe lines, there is disclosed a lining material comprised of a tubular textile jacket made of fibers woven into a tubular form having a coat of a flexible rubbery or plastic material on the external surface thereof and capable of expanding by 7-15% in outer diameter when a pressure equal to the minimum fluid pressure is applied. In Japanese Patent Appln. No. Sho. 58-102361, there is disclosed a lining material for pipe lines which is compri
REFERENCES:
patent: 4334943 (1982-06-01), Zenbayashi et al.
patent: 4368091 (1983-01-01), Ontsaga et al.
patent: 4600615 (1986-07-01), Hyodo et al.
Hyodo Masakatsu
Yagi Isaburo
Ashimori Kogyo Kabushiki Kaisha
Bell James J.
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