Pipes and tubular conduits – Repairing – Patches
Patent
1998-08-31
2000-07-18
Brinson, Patrick
Pipes and tubular conduits
Repairing
Patches
138 97, 264269, F16L 5516
Patent
active
060892765
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of repairing existing underground pipes with a metal tubular material, and a process for producing the metal tubular material for use in the repairing method, more particularly to a repairing method of renovating existing underground pipes, such as sewage pipes, town gas pipes and water supply pipes, by installing a new metal pipe inside the underground pipe with use of a metal tubular material in a flattend and folded shape by plastic deformation, and to a process for producing the metal tubular material in a flattend and folded shape for use in the repairing method.
BACKGROUND ART
The methods of repairing existing underground pipes heretofore proposed are divided generally into those wherein a metal tubular material is used, and those using a plastic tubular material. From the viewpoint of the reliability of repairs, the methods of the former type are more excellent wherein the metal tubular material is used.
The methods of repairing existing underground pipes with the metal tubular material already proposed include the so-called pipe-in-pipe method wherein metal tubular members having a specified length and a circular cross section are inserted into the existing underground pipe while joining the tubular members to one another by welding within a work pit formed by excavation at an intermediate portion of the underground pipe to install a new metal pipe inside the underground pipe.
However, the pipe-in-pipe method is not desirable because this method requires much labor and time for welding the metal tubular members to one another, is low in work efficiency and necessitates a wide work space, i.e., a work pit of increased size, for successively joining the tubular members by welding. Further if it is attempted to use this method for repairing sewage pipes, manholes are too small and unsuitable for use as work pits.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a repairing method adapted to install a new pipe inside an existing underground pipe with a high efficiency with use of a metal tubular material, more particularly a metal tubular material in a flattend and folded shape so as to be wound up into a roll.
Another object of the invention is to provide a repairing method which can be satisfactorily practiced in a work pit comparable to the manhole of the sewage pipe in the size of work space available and which is useful especially for repairing sewage pipes.
Still another object of the invention is to provide a process suitable for producing small quantities of a wide variety of metal tubular materials in a flattend and folded shape.
Other features of the invention will become apparent from the following description.
In renovating an existing underground pipe with a new metal pipe installed inside the underground pipe, the present invention provides a method of repairing the existing underground pipe characterized by transporting a metal tubular material as wound up in the form of a roll to a repair site, the tubular material being folded flat by plastic deformation so as to be diminished in effective outside diameter and to be restorable to a metal pipe of an outside diameter corresponding to the inside diameter of the underground pipe when inflated by application of pressure from inside, installing the roll of tubular material on the ground, subsequently inserting the tubular material into the underground pipe through an underground work pit while unwinding the tubular material from the roll, closing opposite ends of the inserted portion of the tubular material, and thereafter restoring the closed portion of the tubular material to a metal pipe of circular cross section by applying pressure thereto from inside with a pressure fluids
The present invention further provides a process for continuously producing a metal tubular material in a flattend and folded shape for use in a repairing method according to claim 1, the process being characterized by continuously subjecting a metal strip to a first step to
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patent: 4385885 (1983-05-01), Wood
patent: 4867921 (1989-09-01), Steketee, Jr.
patent: 5101863 (1992-04-01), Fujii et al.
patent: 5265648 (1993-11-01), Lyon
patent: 5487411 (1996-01-01), Goncalves
patent: 5810053 (1998-09-01), Mandich
patent: 5816293 (1998-10-01), Kiest, Jr.
Kamide Akira
Miyazaki Yasuo
Brinson Patrick
Osaka Bosui Construction Co., Ltd.
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