Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Cast in situ
Patent
1990-06-25
1991-08-20
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Cast in situ
138 97, 405154, F16L 100, E02D 2910
Patent
active
050409220
DESCRIPTION:
BRIEF SUMMARY
The invention refers to a method for repairing an inaccessible sewer pipe leading away from a house within that section with which it joins an equally inaccessible main pipe, the repair being carried out using a remote-controlled apparatus operating in that main pipe.
Pipes which must conduct sewage away from buildings and which here will be designated as house sewers, join, as a rule, a main sewage pipe running under a street or road passing by the building. These pipes as well as the main pipe are mostly of a diameter that prevents their passage by persons. Repairs can be effected by means of remote-controlled apparatus only which are known from numerous publications and avoid the necessity of excavating the entire pipe network and narrowing or even closing the street or road for traffic for a certain length of time. These apparatus, however, can only be used for repairing the main pipe.
The damages that occur on house sewers consist of leaks, real holes and even of a complete disappearance of the pipe in that particular section so that only the soil remains into which the house sewer originally was laid. Mostly that section can be found there where the respective house sewer joins the main pipe whereas further upstreams there is hardly any defect. By means of a television camera sent through the main pipe the damage can be localized, and its extent can be ascertained, particularly if the camera is equipped with a wide angle lens and/or is pivotally mounted so that even the house sewers are scanned by it. The repair of these damages is imperative because otherwise the sewage may reach the ground water.
A sealing becomes necessary, too, when the house sewer is no longer used. This is mostly the case when the original building is torn down and replaced by a new one. Rarely are house sewers of a new edifice positioned exactly on the same location as the previous pipes. But even if this happens, the old pipes cannot be used anymore, either because their diameter is too small or because they have numerous sharp bends in their course, and in particular if substantially corroded this adds to that decision. Therefore they not only must be closed but also sealed at their junction with the main pipe. If a house sewer is closed further upstream, sewage may penetrate from the main pipe into the soil if it cannot flow off in the main pipe. Because the main pipe is not necessarily excavated over the entire section for connecting the new house sewers to it but only at these junctions, it would be of advantage if the house sewers that are shut down could be sealed and closed by operating from the main pipe.
As already mentioned, it is known to repair the main pipe by means of a remote-controlled apparatus; one example out of many others are the method and the apparatus according to Swiss Pat. No. 640 623 and European Pat. No. 0 025 204. However, it is not known to use such main line repairing apparatus also for remote-controlled repair of the house sewage pipes and effecting this from the main pipe, i.e. with the apparatus remaining in the main pipe.
Thus a method is proposed which, according to the invention, is characterized by what is claimed in claim 1.
This method is so simple that, for carrying it out, the existing apparatus requires only minor modifications; it therefore can be used for the new application with only a few additional devices.
The method according to the invention shall now be explained, by way of example only, with reference to the accompanying drawings in which
FIG. 1 illustrates a plan view of the apparatus used for carrying out the method,
FIG. 2 shows the beginning of the method,
FIG. 3 shows a first subsequent step,
FIG. 4 illustrates the filling of the cavity at the site of the damage,
FIG. 5 discloses a further facultative step, i.e. the boring of the material hardened in the cavity,
FIG. 6 represents another embodiment of the air bag used in the method, and
FIG. 7 still shows a further embodiment of said bag.
FIG. 1 represents a schematic plan view of the apparatus which in this embodiment
REFERENCES:
patent: 3710812 (1923-01-01), Wise
patent: 3950461 (1976-04-01), Levens
patent: 4245970 (1981-01-01), St. Onge
patent: 4428204 (1984-01-01), Brister
Kunststoff-Technik Aktiengesellschaft Himmler
Taylor Dennis L.
LandOfFree
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