Rehabilitation of pipelines and passageways with a flexible line

Details Rehabilitation of pipelines and passageways with a flexible line Rehabilitation of pipelines and passageways with a flexible line

1994-10-20

1998-01-13

Brinson, Patrick

Pipes and tubular conduits

Repairing

Patches

138 97, 156287, 405154, F16L 5516

Patent

active

057068615

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to the lining of pipelines or passageways.
2. Description of the Prior Art
This invention relates to the lining of pipelines or passageways, using materials which are now referred to as "cured in place" materials. Specifically, "cured in place" materials comprise flexible lining tubes including absorbent materials such as fibrous felts, e.g. polyester felts which are impregnated with curable synthetic resin such as polyester or epoxy. Whilst the lining tube is still flexible and is so impregnated, it is held by fluid (liquid and/or gas) pressure against the surface of the pipeline or passageway to be lined, so that it conforms to the surface shape of the pipeline or passageway, and whilst so held it is caused to become hard or rigid by curing of the said synthetic resin. The method of curing may be any of a number of methods including curing by heat, curing by radiation such as ultra violet radiation, or curing by ultrasonics. When heat is used the inflating medium may be heated whilst in the case of light cure and ultrasonic cure resins, an appropriate light or ultrasonic source As pulled through the applied lining tube. Some resins such as epoxy resins cure naturally, and are referred to as ambient curing resins, and these may be used if required.
Various methods as disclosed An U.S. Pat. Nos. 4,064,211 and 4,009,063 have been proposed for curing "cured in place" systems, including that the lining tube, having been pre-impregnated, may be everted into the pipeline or passageway, or alternatively may be pulled into the pipeline or passageway and then inflated, for example by means of an everting membrane. Arrangements have been suggested for effecting the impregnation of the lining tube whilst it is in or whilst it is moving into the pipeline or passageway to be cured as disclosed in U.S. Pat. No. 4,602,974.
Generally speaking, the known methods comprise inserting the lining tube into the pipeline or passageway so as to cover the surface of the pipeline or passageway between respective access points of the pipeline or passageway, such access points comprising for example access manholes, but frequently complete lining of the pipeline or passageway between man-holes is not necessary, as for example it may be the case that only a section of a pipeline or passageway has a defect or is in a poor state of repair such as to require relining by a "cured in place" method. The present invention is devoted to the provision of a system and method for the lining of a section of a pipeline or passageway.
There have been proposals for repairing sections of underground pipelines or passageways using "cured in place" lining tubes, and one such proposal is disclosed in U.S. Pat. No. 5,044,405 wherein a length of the impregnated lining tube is carried inside a flexible carrier tube. The carrier tube is in turn located inside an outer tubular casing, and the entire assembly is located in position inside the pipeline or passageway having the section to be lined. The interior of the casing is pressurized in order to evert the carrier tube and with it the lining tube out of the end of the casing and into fluid pressure contact on the section of pipeline or passageway to be lined. The pressure is maintained whilst the resin is caused to cure by any suitable method, and then the carrier tube and and casing are detached from the lining tube leaving the cured lining tube in position lining the appropriate section of the pipeline or passageway. The use of the carrier tube and casing make the method somewhat complicated as many steps are to be carried out An order to create the assembly which is inserted in the pipeline or passageway.
The present invention provides a simpler method of installation by arranging that an inflatable bladder as the lining tube applied to the outside thereof, and in this connection is might be mentioned that the lining tube may be a continuous tube when view in cross sectional elevation, or it may be a tube formed by a flat web

REFERENCES:
patent: 1605782 (1926-11-01), Rota
patent: 2311196 (1943-02-01), Ahern
patent: 3334691 (1967-08-01), Parker
patent: 4340046 (1982-07-01), Cox
patent: 4461230 (1984-07-01), Hartley et al.
patent: 4526207 (1985-07-01), Burkley et al.
patent: 4778553 (1988-10-01), Wood
patent: 5203377 (1993-04-01), Harrington
patent: 5322653 (1994-06-01), Muller

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