Pipes and tubular conduits – Repairing – Patches
Patent
1994-09-09
1996-03-19
Bryant, III, James E.
Pipes and tubular conduits
Repairing
Patches
138 97, 138109, 264269, 4051501, F16L 100
Patent
active
054996600
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a relining pipe for insertion into a sewer line and similar pipelines to repair them, the relining pipe being made up of a number of substantially rigid pipe elements which are interconnected by pipe couplings, such coupling comprising a female sleeve part, the outer diameter of which is greater than that of the pipe part, and a male locking part, at least one of them having a circumferential shoulder surface transverse to the pipe length and the other having a transverse circumferential stop surface pressing against the shoulder when the pipe elements are pushed against each other, wherein in the bottom of the female part and at the outer end of the male part there are counterparts which snap lock to each other in order to prevent the pipe elements from being detached from each other under tension.
BACKGROUND ART
Many, for example, buried pipelines, such as sewer lines, and among these in particular concrete sewer pipes, deteriorate gradually, and for various reasons also other damage may appear in them, such as cracks, ruptures, and the like. At some stage the pipelines in use must be repaired. This can, of course, in the case of sewer lines be done by digging them up and by replacing them with new pipes. However, the excavation and filling work is expensive and time-consuming, and additionally the excavations cause disturbance to traffic, for example in cities. For this reason, damaged pipelines are now being repaired by means of so-called relining pipes which are, for example, plastic pipes which are inserted from the end of the pipeline section to be repaired into the original pipe, whereby the original pipe is lined inside.
There are several types of such relining pipes. One possibility is to use flexible, for example corrugated, plastic piping, the parts of which are interconnected by welding above ground and the pipe is inserted in a continuous form, for example, through a manhole, into the pipeline section to be repaired. Such piping is inexpensive, but it can be used only in relatively small diameters, since a large-diameter pipe cannot flex in the small space of a manhole. In addition, in such a pipe structure it is difficult to arrange a branching system which could be implemented without opening the intersection area.
Another possibility is to use pipe elements the length of which is at maximum the diameter of a manhole, in which case the pipe elements can be inserted one at a time to extend a pipe element or a row of pipe elements already in the sewer line section, and this relining pipe made up of pipe elements is inserted always one element length at a time into the sewer line section being repaired. One possibility for forming such pipe elements is to cast or otherwise form tubular pieces having female sleeves at both ends. In addition, in this embodiment male pipe lengths are used the length of which corresponds to the length of two successively placed sleeve parts. In this case, the outermost ends of the female parts will settle against each other and the pipe length inside them will keep the ends of the elements in place. This relining pipe is thicker at the female parts than elsewhere. However, this structure has the disadvantage that counter-surfaces which bear the compression force generated between the pipe elements when they are being inserted into the sewer consist only of the said female-part ends, i.e. one point. In the contact point area of the pipe length and the base of the female part there are no surfaces resisting the push, and so the pipe length may slide through the female part to the inside of the element, thereby damaging the structure. Furthermore, this construction has no tension-resistent shaping by means of which the elements becoming detached from each other would be prevented if they for some reason have to be pulled backwards even over a small distance. The result may be a pipe lining having one or more detached joints at unknown locations, in which case the relining is to be deemed a failure.
Another relining-pipe st
REFERENCES:
patent: 3562056 (1971-09-01), Olson
patent: 3872894 (1975-03-01), Streit
patent: 4096887 (1978-06-01), Streit
patent: 4201497 (1980-05-01), Artweger
patent: 4770445 (1988-09-01), Steer et al.
patent: 4773149 (1988-09-01), Kip et al.
patent: 4796669 (1989-10-01), St. Onge
patent: 4848407 (1989-07-01), Smith et al.
patent: 5078430 (1992-01-01), St. Onge
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