Pipes and tubular conduits – Repairing
Patent
1982-06-17
1984-05-08
Shepperd, John W.
Pipes and tubular conduits
Repairing
138 98, 29421E, F16L 5516
Patent
active
044468911
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
The invention of this application is disclosed in corresponding International Application No. PCT/SE81/00325 filed Nov. 4, 1981, the benefit of which is being claimed.
The present invention relates to a method for repairing and/or reinforcing a pipe system, and a device for utilization of the method.
BACKGROUND OF THE INVENTION
1. Field of The Invention
In pipe systems, e.g. located below the ground plane, formation of cracks or fractures can occur, caused by variations in temperature, movement in surrounding material, pressure changes and similar causes. When such pipe systems are located in a position difficult to access, repairs cause obvious problems, e.g. due to the fact that the pipe system must be freed from surrounding material in order to facilitate repair or exchange of a damaged part.
2. Description Of The Prior Art
In U.S. Pat. No. 2,977,994, a method is disclosed for repair of a pipe system, in which a flexible tubular hose is inserted into a pipe system in a deformed or compressed cross-sectional condition, retained in said deformed condition by means of releasable members, whereby the hose after insertion into the pipe system can be expanded to take up a mainly circular cross-sectional position, extending in contact with the internal wall surface of the pipe system.
The above discussed method of repairs makes it thus possible to arrange a flexible hose as an internal restricting surface in an existing pipe system, but for many applications it is desirable to provide an internal metallic surface, in order to obtain resistance against existing variations in temperature and pressure, as well as certain types of liquid and gaseous mediums, which are transported in the pipe system. For certain applications, repair can be performed with a pipe having a smaller diameter than the pipe to be repaired, and by insertion of same into an embraced relationship to the damaged pipe, but to facilitate this operation, the inserted pipe must have a considerably smaller cross-sectional area than the outer pipe, in order to facilitate insertion, and seals must be arranged at the outer end portions of the inserted pipe in contact with the surrounding outer pipe. Said reduction in area is an obvious disadvantage, and it is also extremely difficult to provide seals between the end portions of the inserted pipe and the surrounding pipe, whereby the method only occasionally can be used.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a method for repairing and/or reinforcing a pipe system, and a device for utilization of the method, which facilitates a sealing/reinforcing operation in an existing pipe system, and which produces a metallic internal wall surface in the pipe system in an extremely fast and simple fashion, completely without the sealing problems of the repair method discussed above on the basis of a pipe insertable into an existing pipe system.
DESCRIPTION OF THE DRAWINGS
An embodiment of a device for utilization of the method according to the present invention is more fully described below with reference to the accompanying drawing, intended to simplify the understanding of the method, but the embodiment shown should only be regarded as an example of an embodiment within the scope of the invention. In the drawing:
FIG. 1 is a longitudinal cross-sectional view of a pipe to be repaired, having a device according to the present invention inserted therein;
FIG. 2 is a cross-sectional view of the pipe shown in FIG. 1 with the inserted device, before repair and/or reinforcement has been performed to the surrounding pipe; and
FIG. 3 is a view corresponding to FIG. 2, showing the pipe after repair and/or reinforcement has been accomplished.
FIG. 4 is a cross-sectional view similar to FIG. 1, but showing an embodiment utilizing a different seal.
DETAILED DESCRIPTION
When a pipe breakage has occurred below a road surface, the damaged pipe can often not be reached without causing great difficulties for passing vehicles, and the wo
REFERENCES:
patent: 2977994 (1961-04-01), Xenis
patent: 3175618 (1965-03-01), Lang et al.
patent: 3562887 (1971-02-01), Schroeder et al.
patent: 3590877 (1971-07-01), Leopold
patent: 3781966 (1974-01-01), Lieberman
patent: 4028789 (1977-06-01), Loch
patent: 4140126 (1979-02-01), Choudhury
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