Lining of pipelines or passageways using a push rod adhered to r

Details Lining of pipelines or passageways using a push rod adhered to r Lining of pipelines or passageways using a push rod adhered to r

1998-07-27

2000-11-14

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

156294, 156423, 264269, 264516, 138 97, F16L 5518, B29C 6334

Patent

active

061464910

DESCRIPTION:

BRIEF SUMMARY
This invention relates to the lining of pipelines and passageways wherein a liner tube is fed into the pipeline or passageway, and then is inflated onto the pipeline or passageway surface. The liner, which is a flexible tubular structure, includes a layer of resin absorbent material such as a fibrous felt which is impregnated with a curable synthetic resin, and the basis of the lining operation is that when the lining tube is inserted and inflated up to the size of the inner diameter of the pipeline or passageway, the resin is cured so that the flexible liner turns into a rigid lining lying on the pipeline or passageway surface.
This basic technology is now extremely well known, and is practiced throughout the world. The basic idea related to this lining operation is disclosed in U.S. Pat. No. 4,009,063, which discloses that the liner is pulled into the pipeline or passageway and then is inflated using a fluid medium such as air or gas or even a liquid such as water.
U.S. Pat. No. 4,064,211 discloses a modification of the basic idea and in this U.S. patent it is suggested that the liner after impregnation should be everted into and along the passageway using a liquid to perform the eversion and to provide a means whereby the inwardly travelling portion of the liner is buoyantly supported before reaching the everting face.
Modified methods for the insertion and inflation of the liner have also been proposed in the past, and for example in the paper entitled "Inflatable Terylene Reinforced Resin Pipe Linings" by D Rhys-Jones presented at the First International Conference on the internal and external positions of pipes on Sep. 9-11th, 1975 at the University of Durham, England, it is disclosed that the liner may be pulled into the pipeline or passageway, and then an expansion tube or hose is everted into the liner when it has been pulled into the pipeline or passageway and when it is still flexible and flat, in order to inflate the liner up to the pipeline or passageway surface. An advantage of this method which is identified by the description pull-in and inflate is that the expansion tube which is used can be of relatively light weight so that air can be used as the medium for expanding the liner. Additionally, the expansion tube or hose can be withdrawn from the pipeline or passageway after the resin of the liner has cured and the liner has turned into a rigid lining, so that the expansion tube or hose can be reused.
In U.S. Pat. No. 4,786,345, it is explained how this pull-in and inflate system can be used in connection with the lining of what are called lateral pipelines or passageways, being the service pipes which lead from for example domestic dwellings or office buildings to a main line underground sewer.
In the lining of these lateral pipes, difficulties arise because it is not easy to position the liner inside the lateral pipe from inside the main sewer, although a number of attempts have been made to do this as indicated for example in the following patent specifications:
The present invention is concerned with a method of inserting resin impregnated flexible tubular liners into pipelines and passageways, and in particular those pipelines and passageways such as lateral pipes where access to one end of the pipeline or passageway is difficult.
In accordance with the present invention there is provided a method of lining a pipeline or passageway by means of a length of flexible tubular liner which comprises or includes resin absorbent material which is impregnated with a curable synthetic resin comprises attaching one end, (the leading end). of the liner to one end, the (leading end) of an insertion rod means so that by pushing the rod, leading end first, from one end of the pipeline or passageway to be lined, to the other end of the pipeline or passageway, causes the liner to be pulled into the pipeline or passageway, and wherein the said leading end of the rod is connected to the leading end of the liner by a means enabling the rod to pull the liner into the pipeline or passageway, but when the ro

REFERENCES:
patent: 3294121 (1966-12-01), Powell et al.
patent: 4786345 (1988-11-01), Wood
patent: 5108533 (1992-04-01), Long, Jr. et al.
patent: 5395472 (1995-03-01), Mandich

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