Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1987-11-12
1991-02-26
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
138129, 138154, 156195, 156294, 156391, 156392, B29C 5378, B29C 6332
Patent
active
049959298
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an improved method of and means for lining or over-wrapping of conduits and the lining of tunnels.
In the past when a conduit such as a sewer pipe made of clay or concrete or cast-iron has become in need of repair, a tube of plastics of a diameter smaller than, or greater than, the corroded or damaged part was placed into position to cover at least the damages areas.
In the case where the conduit required to be lined the annular space between the new tube and the old clay or concrete or cast-iron pipe was filled with grout, usually a cementitious nature, but one of the problems of such a practise was that, in the case of the finished relined conduit, the conduit so formed is of smaller diameter than the original conduit, particularly when allowance for grouting is required.
More importantly a conduit to be relined is usually out of alignment and has undulations and curves, which means that the relining tube which is formed of a plastics material must be even smaller in diameter to negotiate such undulations and misalignment.
Also when a hole is formed directly into the soil for the purpose of carrying water or cables, or vertically for the purpose of creating a well or bore hole, the lining of such holes requires a lining pipe of a diameter considerably smaller than the bore of the hole because of the friction which is generated between the earth and the liner pipe being inserted.
One of the objects of the present invention is to provide an improved method of and means for lining conduits either where an existing conduit is to be replaced or where a new conduit is to be provided.
A further object is to provide an effective method and means for applying an encasing tube to an existing pipe.
A still further object is to provide a machine of relatively simple construction and to provide a method of insertion and a form of tube which forms the lining whereby the lining can readily be positioned with a minimum loss of cross sectional area of the conduit.
The objects of the invention are achieved by utilising a tube formed by winding a strip helically and interconnecting the edges of the convolutions of the strip with a controllable slidable fit to produce a tubular article, with or without longitudinally running or otherwise positioned ribs, characterised by the steps of holding the tube at a selected diameter while positioning it in or on a conduit, then changing the diameter of the tube by causing the interconnected edges of the strip forming the tube to slide one relative to the other, and maintaining the tube at the changed diameter.
The invention can be brought into effect by producing a tube by helically winding on a machine of a type forming the subject of earlier patents by the same Inventor, using either an annulus of rollers or using differential driven rollers which curve the strip to the required form and overlap the edges, which strip is formed from a thermoplastic material which may have a smooth surface on one side and a ribbed surface on the other side but can be a plain strip with edged interengaging formation, and may have a surface adapted to lock to grouting.
Under some conditions the surface can be smooth on both sides and the strip can be formed to have longitudinal closed cavities formed between the ribs but the strip is such that the machine can curve the strip in an annulus or by rollers to form a tube by helically winding the strip and interengaging the overlapping edges of the strip.
Thus according to this known art a strip of a required profile is formed of plastics which may be made by the extrusion process to have the interlocking members at two edges of the strip so that when such a strip is wound in the helical winding machine to interlock the edges of the strip, it is formed into a tube of relatively great strength and durability.
Normally these tubes are formed in a way such as to retain the diameter after winding, the interconnecting means at the edges of the strip being arranged to so tightly interfit and lock together, particularly when adhesive is
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Ball Michael W.
Maki Steven D.
Peterson Gordon L.
Rib Loc Australia Pty. Ltd.
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