Pipes and tubular conduits – Repairing – Patches
Patent
1996-03-25
1999-07-27
Brinson, Patrick
Pipes and tubular conduits
Repairing
Patches
138 97, 264269, 264516, 156287, F16L 5516, B29C 6336
Patent
active
059273410
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the lining of pipelines and passageways, using linings which have now become known as "cured in place" linings, which comprise tubular structures comprising or including at least one layer of resin absorbent material which is impregnated with a curable synthetic resin. The tubular structure while impregnated with resin and whilst the resin is uncured, is shaped to the surface which it is to line and held in that position by fluid pressure. Curing of the resin then takes place, or is caused to take place, so that the tubular structure will form a rigid layer which remains in place on the surface by virtue of its own rigidity and/or by virtue of bonding to the surface, but in any event an effective lining is provided.
Cured in place systems have been used very successfully for many years for the lining of underground pipelines and passageways, in particular sewer pipes, and examples of cured in place lining systems are disclosed in U.S. Pat. Nos. 4,009,063 and 4,064,211.
In these prior patents, it is envisaged that long lengths of main sewer lines will be lined, but in any main sewer line there are what are known as lateral connections which are the side or branch pipes which lead from the sewer to for example domestic consumption points. When a lining is applied along a main sewer as described in said US patents, the tubular structure will cover the lateral connections and these subsequently have to be reopened by the cutting away of coupons of the rigid lining in register with the lateral connections.
It is also been proposed to apply lining tubes in the said lateral passageways, but for a long time there has been a problem in providing an effective coupling arrangement in the region where the lateral passageway meets the main pipe. Indeed, in many cases it is the lateral/main pipe connection which causes the greatest problem in practice and often in a defective sewer pipe, it is only the lateral/main pipe connections which require to have a cured in place lining structure applied thereto.
When main line linings have been applied, and coupons are cut therefrom, difficulties often remain at the lateral/main pipe connections, and attempts have been made to cure these defects, but generally speaking the procedure is difficult and unsatisfactory.
The present invention seeks to provide a cured in place assembly for a lateral/main pipe connection whereby many of the difficulties at present existing will be overcome.
More particularly, the invention seeks to provide an assembly which can be positioned in the region of a lateral/main pipe connection and by a single operation results in the creation of a cured in place structure forming an effective lateral main pipe seal.
In accordance with the invention in a broadest aspect thereof an assembly for effecting a cured in place lining in the region of a lateral/main pipe connection, comprises a length of tubular structure for application to the main pipe surface to each side of a lateral connection, said length of main pipe tubular structure having a wall aperture for register with the lateral pipe, and a lateral extension tubular structure for extending into the lateral, said lateral tubular structure and main pipe tubular structure being of cured in place type in that each comprises at least one layer of a resin absorbent material which in use is impregnated with curable synthetic resin.
By providing this assembly, which is in effect a "tailored" unit to be urged into close contact in the region of the lateral/main pipe connection, a simple and effective means is provided for addressing the difficulty of forming a seal in the region of a lateral/main pipe connection.
To interconnect the extension tubular structure and a main pipe tubular structure, the main pipe tubular structure may be initially fabricated and provided with an aperture therein. The extension tubular structure may be provided at one end with a collar and the extension tubular structure is fed through the said aperture in the main pipe tubular structure so that the collar l
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PCT WO 91/07619 Meijers et al., Nov. 1990.
Brinson Patrick
Buchanan Lloyd G.
Insituform (Netherlands) B.V.
Wolfson Michael I.
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