Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,...
Patent
1995-10-30
1998-09-15
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
138 98, 405146, F16L 100
Patent
active
058070257
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of lining a sewer, which method comprises introducing an inner pipe lining pipe, liner, or reliner, into an already existing and possibly damaged sewer, and filling the annular space between the outer surface of the inner pipe and the inner surface of the sewer with filler. The invention also relates to an introduction and removal slide usable in implementing this method.
The renovation of damaged, mostly old, sewer pipes of inaccessible cross-section has become a grave concern for operators of sewage pipe networks and increasingly requires ever rising financial and personal expenditures. The substantial lengths of old sewer and drainage ducts, respectively, which are already damaged or which are expected to become damaged shortly pose problems both in terms of drainage technology (cloggings, road cave-ins, etc.) and in terms of environmental technology, because groundwater gets contaminated by emerging waste water. Because of narrow routes and high traffic density, in most cases only underground modes of construction are feasible for the renewal of ducts already present, and the following requirements must be met: no or only little groundwork short construction times, minimal interruptions of the operation of the network, maintenance or improvement of the existing hydraulic conditions and low costs as compared to a new construction carried out in open construction manner.
Among the renovation methods, those methods become increasingly important which re-line the existing, damaged sewer by introducing a new inner pipe into the sewer and filling the annular space remaining between the outer surface of the inner pipe and the inner surface of the sewer with filler. However, particularly if paths of more than ten meters are to be filled, filling of the annular space proves to be difficult. Hitherto, filler has been pushed under pressure into the annular space from one side or flushed in without pressure. Complete filling of the annular space can hardly be guaranteed, and cannot be checked, either.
Departing from this, it is the object of the present invention to provide a method of the initially mentioned type which is distinguished by an easier handling, a complete and checkable filling of the annular space, a large choice of fillers available and shorter filling times required.
The method according to the invention of the initially mentioned type is characterized in that for introducing filler into the said annular space, at least one supply duct which is preferably provided with a delivery nozzle is introduced into this annular space until this at least one supply duct extends over the entire length of the inner pipe, and that subsequently this at least one supply duct is removed by a return movement and during removal of this at least one supply duct filler in an amount sufficient or completely filling the annular space is delivered into the annular space through this at least one supply duct or through the nozzle provided on this at least one supply duct. By this design the above-indicated object can be met well.
As regards the organization of construction sites and the procedure, a suitable embodiment of the method according to the invention is characterized in that at least one supply duct is introduced into the annular space, starting at one end of the inner pipe and extending to the other end of the inner pipe.
Another embodiment of the method according to the invention with which great lengths of the respective sewer sections to be lined can be treated is characterized in that at least one supply duct is introduced from each end of the inner pipe as far as to a site located in the middle region of the longitudinal extension of the inner pipe and from there is returned to its site of introduction.
For introducing the supply duct utilized in the method according to the invention into the sewer, an advantageous embodiment of this method provides for introducing the supply duct to be arranged in the annular space at the outer surface of the inner pipe into the sewer toge
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Klug Kanal-, Leitungs- und Umweltsanierungs-Gesellschaft M.B.H
Taylor Dennis L.
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