Pipes and tubular conduits – Repairing
Patent
1995-01-20
1997-09-30
Vargot, Mathieu D.
Pipes and tubular conduits
Repairing
138125, 138137, 156287, 264 36, 264269, 264516, B29C 6334
Patent
active
056717784
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention provides a tubular material for repairing pipe lines (hereinafter referred to as repairing tube) which is to be used in pipe lines such as gas conduits, water supply lines and sewer lines, chiefly those buried in the ground, for the purpose of repairing the pipe lines. More particularly, the present invention relates to a repairing tube comprising a rigid pipe formed of thermoplastic resin and a tubular woven fabric and a method for repairing or reinforcing a pipe line with the repairing tube. Furthermore, the present invention relates to a method for removing the repairing tube in its collapsed form out of the pipe line, for example when the repairing tube installed in the pipe line has become superannuated or it has been collapsed for some reason or other to impair the function of the pipe line and hence it is desired to reline the pipe line.
BACKGROUND ART
A lining-based method for repairing a pipe line has already been known, wherein a rigid thermoplastic resin pipe formed of rigid polyethylene, rigid polyvinyl chloride or the like is inserted into the pipe line, and the resin pipe is softened by heating and then inflated under pressure to form a rigid tube in the pipe line.
Insertion, however, of rigid resin pipes in their cylindrical shape into pipe lines is only possible with great difficulty, and handling of lengthy resin pipes in their cylindrical shape is also not easy because, for example, of taking up substantial space.
In this conventional method, a rigid resin pipe is brought, before being inserted into a pipe line, into a state which will not give rise to any significant resistance in the pipe line, for example, by using as the resin pipe a pipe with a smaller diameter than the inner diameter of the pipe line or by flattening and deforming into a U-shaped cross-section the resin pipe. After the resin pipe has been inserted into the pipe line, a heated and pressurized fluid is fed into the resin pipe thereby to soften and simultaneously expand the resin pipe so that it conforms to the interior surface of the pipe line (see, for example, U.S. Pat. Nos. 4,867,921 and 4,985,196; Japanese published unexamined patent application Nos. 58-88281 (JP, A, 58-88281), 64-64827 (JP, A, 64-64827) and 2-202431 (JP, A, 2-202431).
As a representative method for deforming such resin pipes for reduction in dimension there may be mentioned a method described in U.S. Pat. No. 4,867,921. This method involves producing a resin pipe 100 by extrusion molding, flattening the resin type immediately thereafter, folding double the resin pipe 100 kept in its flattened configuration as shown in FIG. 20, winding the so configured resin pipe 100 onto rolls for storage, pulling the resin pipe as such into a pipe line at the site of execution and then feeding steam into the resin pipe 100 to conform it against the interior wall surface contours of the pipe line.
Another method described in Japanese published unexamined patent application No. 58-88281 (JP, A, 58-88281) involves flattening a synthetic resin pipe, further folding double the synthetic resin pipe kept in its flattened configuration, inserting the resulting synthetic resin pipe into a pipe line and then feeding steam into the synthetic resin pipe to heat and pressurize the same so that the pipe conforms to the interior surface wall contours of the pipe line.
Japanese published unexamined patent application No. 64-64827 (JP, A, 64-64827) discloses another method wherein a synthetic resin pipe in a heated and thereby softened state is supported on a long supporting member and the supporting member is pulled into a pipe line thereby to concomitantly insert the synthetic resin pipe carried thereon into the pipe line. As the supporting member there is used a fiber-reinforced plastic sheet, both side edges of the sheet constituting a fastener which when closed brings the sheet into a tubular configuration. The synthetic resin pipe mentioned above is wrapped in this fiber-reinforced plastic sheet provided with the fastener and the
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Makimoto Futoshi
Saito Hitoshi
Sakuragi Hiroyuki
Seshimo Masahiro
Sokawa Takuji
Ashimori Kogyo Kabushiki Kaisha
Vargot Mathieu D.
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