Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1994-10-20
1998-06-09
Bagnell, David J.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
138 97, 405155, E03F 306, F16L 55165
Patent
active
057624500
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a system and a method for relining transport lines such as sewer pipelines or sections thereof, with an inspection capability.
Relining is a method of refurbishing damaged transport lines, generally laid underground, by inserting a new interior pipe train or similar construction into the damaged existing line.
BACKGROUND ART
In a known relining method, a long train of weld-connected plastic pipes such as polyethylene is pushed into the damaged sewer section. Since the pipes are generally inflexible, large excavations are required for this procedure.
In so-called short-pipe relining, short plastic pipes with a length of about 0.5 to at most 1 m are joined together in standard existing manholes and, from this existing manhole, pushed or pulled into the sewer section being refurbished (DE-A 34 13 294).
It has been proposed (DE-A 27 04 438) to refurbish sewer pipes by inserting into the interior of the drain pipe a flexible pipeline whose outside diameter is smaller than the inside diameter of the drain pipe, whereby the flexible pipeline is positioned at a distance from the drain pipe to form a annular space. In this method, this annular space is completely filled with a hardenable, low-viscosity fill mass, such as magnesium cement.
In DE-A1 39 30 984, a method is proposed in which a soft-PVC flexible lining (inliner) is employed with a strong-threaded random-structure fiber outer layer of polyamide serving as a spacer. A rapid-hardening mortar (so-called insulator) is inserted into the annular space formed via the random-structure fiber layer between the sewer pipe being refurbished and the inliner itself and allowed to harden. A similar method is proposed in DE-A1 39 34 980, whereby HDPE (high density polyethylene) is one suggested material for the inliner.
In "Sonderdruck aus bbr 5/90; U-Liners; Protokoll einer Sanierung, Imbema Rohrsanierungs GmbH," a method of relining sewage channels is described in which a continuous rigid HDPE pipe is folded at high temperature during manufacture into a U-shaped cross-section and this deformed cross-section is secured with straps. This structure, which is still quite rigid, is then pulled into the sewer and steam-heated under elevated pressure (about 1.3 bar) to the thermoplastic state, in which the HDPE pipe reverts to its original round cross-section.
Finally, in DE-U 90 12 003, WO 91/10862, and the company brochure "Steuler Umwelttechnik, Bekaplast fur Kanalrohre, 1989," a nubbed sealing sheet for relining sewage pipes is disclosed. This rigid HDPE inliner, however, can be used only for subsequent refurbishment of passable sewer pipes of large diameter.
DE-C 23 62 784 discloses a system in which a flexible fleece tube, plastic-coated on one side, is first saturated with resin and hardener such that the tube, after insertion by the inversion method into the pipeline being refurbished and after being pressed against the pipe wall by water pressure, hardens when heat is applied to the system, thus forming a new line system with a rigid pipe wall. Since the resin/hardener system in the carrier fleece has only a limited processing time (pot time), the saturation process, transportation to the site (in a refrigerated vehicle, if necessary), and insertion must occur within a relatively short time period. For refurbishing an entire pipe train, this system with resin-impregnated fleece is an adaptable solution.
This method, however, can be used satisfactorily only for refurbishing pipes without relatively large cracks or pits, since these could allow the resin to escape before hardening or since the new flow channel would otherwise exhibit unacceptably high unevenness. In a similar method (EP-A1 0 260 341), this disadvantage is avoided by first pulling an outer resin-impregnated flexible fleece tube into the pipe being refurbished, after which an inner flexible calibration tube, also resin-impregnated, is inserted by the inversion method into the outer fleece tube. Hardening of the resin results in a rigid new pipe that is no lon
REFERENCES:
patent: 5167258 (1992-12-01), Rice
patent: 5305798 (1994-04-01), Driver
patent: 5395472 (1995-03-01), Mandich
Abstract of DE 34 13 294 (undated).
Abstract of DE 27 04 438 (undated).
Abstract of DE 39 30 984 (undated).
Abstract of DE 39 34 980 (undated).
Abstract of DE 23 62 784 (undated).
Abstract of EP 260,341 (undated).
Bagnell David J.
HT Troplast AG
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