Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1994-10-17
1997-08-12
Maki, Steven D.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
138 97, 156294, 264269, 264573, 427236, 427238, B29C 6336, B29C 6348
Patent
active
056561172
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the lining of pipelines and passageways, especially the lining of underground pipelines and passageways for the rehabilitation, improvement, repair or change of use or coating of such pipelines or passageways.
DESCRIPTION OF THE PRIOR ART
There are now established a number of techniques for the lining of pipelines and passageways, and these techniques are to a greater or lesser extent successful, and the techniques tend to lend themselves to particular application. That is to say, some techniques are better for some circumstances, whilst other techniques are better for other circumstances.
For example, there are known cement mortar lining techniques wherein cement mortar is applied directly to the passageway or pipeline surface by spraying, trowelling or by other methods, and such cement mortar lining may be provided with a reinforcement means such as metallic rods, bars or the like. Cement mortar lining techniques are particularly suitable for large pipelines and passageways where man entry is easy, but as the pipeline or passageway reduces in size until man entry is not possible, cement mortar lining is not as appropriate as other techniques, although it is still possible to effect such a lining method by pulling a spraying device through the pipeline or passageway and by spraying the cement mortar material onto the pipeline or passageway surface. Adopting similar methods, it is possible to apply other lining materials to passageway surfaces, such as curable synthetic resinous materials which like cement mortar harden to provide a rigid lining on the pipeline or passageway surface. Such synthetic resinous materials, which are of course curable, may or may not be provided with reinforcement as required. Such reinforcement may comprise fibrous materials such as glass fibre or scrim or felt materials.
Other techniques which are used for pipeline or passageway lining comprise the fabrication of a flexible lining tube which embodies an absorbent layer or layers, and such layer or layers is or are impregnated thoroughly with a curable synthetic resin at ground level, and then the impregnated bag is fed into the pipeline or passageway before the resin cures, and is held to the surface thereof by fluid pressure until the resin cures forming a rigid lining pipe inside the existing pipeline or passgeway. These techniques are particularly suitable for the lining of pipelines or passageways which are of the smaller non man entry size, although they can be used for man entry pipelines and passageways if required.
U.S. Pat. No. 4,077,610 for example describes a method and apparatus for everting a tube through the interior of a pipe with a view to providing a means for passing an article such as a wire or fibroscope through the interior of the pipe. In one embodiment of U.S. Pat. No. 4,077,610 the tubing is folded in a way similar to a paper lantern and the folded section advances and progressively everts along the passageway behind a fibroscope due to pressure from an external source.
Other techniques involve the feeding directly into the pipeline or passageway of semi-rigid plastic pipes of smaller size than the pipeline or passageway, followed by the filling of the space between the pipeline or passageway and the rigid pipe with a grouting material.
The present invention is concerned with a pipeline or passageway lining method wherein a fluent composition such as cement mortar or a curable resin or the like is sprayed or in suitable circumstances otherwise applied to the pipeline or passageways surface so as to form in effect a pipe of such material (when it has cured or hardened) lying inside the existing pipeline or passageway to form a lining for same.
One of the difficulties which arises in connection with the techniques referred to above wherein a fluent composition is applied to the pipeline or passageway surface is that the composition will tend to anchor to the pipeline or passageway surface on the one hand, and on the other hand, where the pipeline or pas
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Bull, administratrix Miranda J.
Wood, deceased Eric
Insituform (Netherlands) B.V.
Maki Steven D.
Wolfson Michael I.
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