Pipes and tubular conduits – Repairing
Patent
1996-08-09
1998-09-01
Stryjewski, William
Pipes and tubular conduits
Repairing
138 98, 138154, 4051501, F16L 5518
Patent
active
057997012
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is generally related to a method and an apparatus to form a lining layer inside an existing pipe, such as sewerage, water and gas pipes, and more particularly, to the method of and the apparatus for lining by inserting in the existing pipeline a pipe or a so-called lining pipe formed out of a long, beltlike profile member being supplied involutely.
DISCUSSION OF THE BACKGROUND
There is a known art of lining an existing pipe as disclosed, for example, in the Tokkohei 2-12136 gazette. According to the conventional art, lining begins with a pipe making machine installed in a manhole of an existing pipeline and ends in providing by means of thrust force the existing pipe with a lining pipe formed out of an involute beltlike member being continuously supplied.
In the conventional art, however, the longer the lining pipe is, the heavier it will be, and the higher the friction resistance between the exterior of the lining pipe and the wall of the existing pipeline will be, requiring a bigger thrust force. Similarly, as the lining pipe is bigger in diameter, the weight per unit length will increase, needing a much bigger thrust force. This necessitates to provide a large-scale motive power equipment at a higher cost to get a required thrust force.
This suggests that there is something to be desired with the conventional art in coping with long and large-diameter lining pipes.
Another problem with the conventional art lies in that it is not possible to line the curved portions of a pipeline.
It is, therefore, an object of the present invention to provide a lining technique applicable to produce a longer and larger-diameter lining pipe and to a curved pipeline without modifying noticeably the composition of a beltlike member being used in the prior art, starting with a new idea to resolve the above problems with the conventional art.
The present invention was thus produced on such knowledge that a longer, larger-diameter involute lining pipe is available for the lining of a pipeline by leaving it behind.
SUMMARY OF THE INVENTION
The methods and apparatuses according to the present invention are as shown below by construction to attain the above-mentioned purposes.
The first invention is a method of lining a pipeline, and of the composition that a long, beltlike member having joints on both edges thereof is continuously supplied involutely, and the joints adjoining each other are engaged to produce a lining pipe within the pipeline. The lining pipe thus formed is left behind and another lining pipe is additionally formed, using a beltlike member supplied anew and ahead of the lining pipe already formed. There is arranged a jointing roller block consisting of 2 rollers, inner and outer, on the interior and exterior of the edge of the already formed pipe respectively, the outer roller so provided as to come into contact with the exterior of the beltlike member, and the inner roller so provided as to come into contact with the interior of the beltlike member. These two rollers engage with each other where the already formed pipe is closed with the newly supplied beltlike member, and at least the outer roller is driven by rotation.
Depending on the above composition, the joints adjoining each other are jointed together through pinching action of the rollers at the closure position of the beltlike member. The jointing roller block revolves on its axis and moves by means of its own driving force, and a lining pipe is formed while it rotates on its axis.
In addition, the jointing roller block is supported with a mounting frame being substantially rigid, but it is possible to provide an embodiment according to which the roller block is supported without such a mounting frame.
The second invention is a pipeline-lining apparatus to carry out the first invention. The invention is such that there is left behind a lining pipe formed out of a long beltlike member which is continuously supplied involutely and has joints formed on both edges thereof, the joints adjoining each
REFERENCES:
patent: 3122115 (1964-02-01), Siegwart
patent: 3606670 (1971-09-01), Wienand et al.
patent: 4687690 (1987-08-01), Menzel
patent: 4995929 (1991-02-01), Menzel
patent: 5074943 (1991-12-01), Menzel
patent: 5101863 (1992-04-01), Fujii et al.
Akimoto Eiki
Kitahashi Naoki
Kitayama Yasushi
Yamashiro Hamao
Adachi Construction Industry Co. Ltd.
Sekisui Kagaku Kogyo Kabushiki Kaisha
Stryjewski William
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