Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1983-09-07
1986-04-08
Dawson, Robert A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
138 97, 156287, 156294, 156295, B32B 3112
Patent
active
045810850
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the lining of pipelines or passageways, including underground sewers and pipes, all collectively referred to herein as passageways.
There is already known and now widely practised a method of lining passageways, especially underground passageways, which extend substantially horizontally, wherein a lining tube of a flexible nature is everted into and along the passageway by means of a fluid, specifically a liquid of a specific gravity which is matched to that of the inwardly travelling lining tube, so that the lining tube is buoyantly supported by the everting liquid. This is of importance because the lining tube comprises or includes a resin absorbent layer which is impregnated with a curable synthetic resin. It is therefore of substantial weight and its support as it travels inwardly along the passageway is necessary, according to the known method.
When the lining is in position, when in the passageway, the resin is cured or caused to cure so that the lining becomes in fact a rigid resin pipe which is free standing.
It is usual to use water as the everting liquid, but in many circumstances a ready supply of water is not always available, and as the process may involve lining considerable lengths of passageway, in some cases large quantities of water may be required.
The present invention contemplates an alternative method for the placement of a liner, such as that described above, wherein the use of large amounts of water is not necessary, and in accordance with the present invention the passageway is lined by everting a flexible lining tube into the passageway, wherein a pressure medium keeping the everted lining on the passageway surface is gaseous in nature, and in addition, along the inside of the everting lining tube is a pull cord, wire, tape or the like, on which a tension force can be applied to assist the eversion process.
In order to assist the sliding of the lining along the inside of the passageway, there may be used a lubricating medium such as a lubricating soap or oil, this aspect of the invention being useful for applications wherein the lining tube is of or includes a resin absorbent layer which is impregnated with a curable synthetic resin.
In the preferred method of operation, air is used to keep the lining tube on the passageway surface and to assist in everting the lining tube along the passageway, and the pull cord or tape has a tension applied thereto to assist in the eversion.
In the passageway, downstream of the everting face, a vacuum may be applied in order further to assist the eversion.
When the lining includes a curable resin as abovementioned, upon completion of the eversion, the everted lining may be filled with hot air in order to initiate or effect the curing of the resin.
The cord or tape may be applied to the lining tube interior in any suitable manner, so that it will emerge from the everting face, and detatch from the tube at the everting face so that tension can be applied thereto in order to assist the eversion.
It may well be that the pull cord or tape in fact performs the eversion, the gaseous medium serving simply to keep the everted portion of the tube inflated.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings, wherein:
FIG. 1 is a diagrammatic sectional elevation showing how the lining process according to the known method is performed;
FIG. 2 shows how the process according to the present invention is performed.
Referring to the drawings, in FIG. 1 there is shown an underground passageway 10 which is in the process of being lined according to the known method by means of lining tube 12. The lining tube 12 is flexible in nature and comprises, before eversion, an inner tube 14 of a synthetic felt which is thoroughly impregnated with a curable resin (for example epoxy or polyester resin), and the outer surface of the felt is covered by a fluid impermeable membrane. One end 18 of the flexible lining tube 12 is turned back upon itself and anchored at one end o
REFERENCES:
patent: 2794758 (1957-06-01), Harper et al.
patent: 3132062 (1964-05-01), Lang et al.
patent: 4064211 (1977-12-01), Wood
patent: 4135958 (1979-01-01), Wood
patent: 4350548 (1982-09-01), Zenbayashi et al.
Two 1977 articles from M. Chimia, pp. 99 & 101.
Dawson Robert A.
Insituform International N.V.
Philpitt Fred
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