Pipes and tubular conduits – Repairing – Patches
Patent
1995-08-07
1997-12-02
Brinson, Patrick
Pipes and tubular conduits
Repairing
Patches
138 97, 264269, 156 94, F16L 5516
Patent
active
056925433
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the lining of pipelines and passageways, and in particular has reference to the lining of underground pipelines and passageways which are known as "laterals, which are pipelines and passageways which connect for example a main sewer pipe to a consumer point such as a domestic dwelling or other building.
The invention relates to a lining for laterals, a method of lining laterals and a launcher apparatus for applying the lining to the lateral.
Basically, in a sewerage system, a main sewer pipe will run underground directly along the line of a main street or thoroughfare, and the users of the system will be connected to the main sewer pipe by means of lateral pipes which extend transversely off the main sewer pipe to user points on opposite sides of the road, street or thoroughfare.
The laterals tend to meet the sewer pipe at either of 2 angles namely 45 degrees or 90 degrees, although because of the antiquity of some of the sewer systems at least in countries like the United Kingdom, the lateral may meet the main sewer pipe at any angle, provided of course that the lateral can perform its function of discharging sewage and other effluent into the main sewer.
There has been known now for a number of years a lining process for the lining of main sewer pipes wherein a flexible lining tube includes a resin absorbent layer which is impregnated with curable synthetic resin. The lining tube is urged by a fluid pressure onto the surface of the sewer and is held in position until the resin cures, whereby a hard rehabilitating lining forms on the sewer surface. The lining in effect is a pipe within a pipe and becomes freestanding when curing has been completed, which provides an extremely effective improvement of the sewer surface.
More recently, there has been a demand for and a need to reline the lateral pipes using mainly a lining tube of the same basic construction as the lining tube which is used for the main sewer pipe, and a number of proposals for methods and apparatus have already been made in order to meet this requirement.
We for example have effected a number of developments in this area, and details of these developments are disclosed in the following patent specifications British Patent Numbers: 2,091,611; 2,092,493, 2,096,265; British Parent Application Numbers: 8527700; 9127315.1; European Patent Number 0241719; U.S. Pat. Nos.: 4,786,345; 4,677,472; 5,044,824; U.S. patent application Nos. 532,866; 07/419,068; International Patent Application Numbers: PCT/GB91/00364; PCT/GB91/00628.
Because of the nature of the layout of main sewer pipe and laterals it is generally recognised that to insert a lining into a lateral, the best method is to evert the lining tube into the lateral by a "launcher" type apparatus which is positioned inside the main sewer. A main reason for proceeding in this way is that access to the lateral from the consumer point is inconvenient to the user, and frequently users will object strongly to working for effecting lateral lining, from a position inside the dwelling or building. It is obviously much better if the contractor can perform the lining operation from inside the main sewer as the consumer is therefore in no way disturbed other than to have the service cut off for a short period whilst the lateral lining takes place.
In "launcher" apparatus, the apparatus is designed so as to have a pressure enclosure so that fluent medium under pressure can be applied to that enclosure, the enclosure has an outlet and is adapted so that the tube to be everted into the lateral extends from the outlet, and then a collar or flange thereof can be held in relation to the outlet so that by pressurising the enclosure the tube is everted into the lateral. The tube may be and preferably is enclosed in a carrier tube which simply forms a carrier for the lining tube and everts with the lining tube into the lateral. When the lining tube is in position, the carrier tube is removed so that it can be reused. A carrier tube is particularly important when the lining tube is one whi
REFERENCES:
patent: 5340160 (1994-08-01), Meijers et al.
Brinson Patrick
Insituform (Netherlands) B.V.
Wolfson Michael I.
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