Process for relining conduits, in particular for sanitary conduits

The invention relates to a method for rehabilitation of pipelines, especially downpipes.

If pipes must be renovated, located in homes, it is necessary to replace the old pipes with new ways these houses inhabited dwellings on such a restructuring leading to significant impairments. The replacement of old pipelines with new means rule for the affected homes that they are no longer habitable for several weeks. Moreover, this restructuring is associated with considerable structural measures and costs. there is no method in the prior art known to date, such pipes, especially downpipes, could be rehabilitated in the manner with which that a replacement thereof is unnecessary.

The invention is therefore based on the object to provide such a method for rehabilitation of pipelines, especially downpipes available, through the replacement of the pipes is unnecessary.

This object is achieved by combining the features of claim 1. The fact that the low-viscosity coating composition is applied in the form of a liquid column, the application body can be moved through gravitational force without further assistance through the pipeline. With the application body to the liquid column moves down tube, thereby lining the inner wall of the treated pipe is effected with a formed from the coating composition layer. It is necessary that the application body the clear cross section of the pipeline completely fills, since otherwise the liquid column can not be formed. By exploiting the force of gravity it is also achieved that the application body, the pipeline to be rehabilitated with low speed happens, so that it can be easily removed at the space provided at the lower end of the tubing back out of the tube and not by an excessively high speed pipeline damaged.

Pipelines, which are formed as drop tubes in buildings, regularly have so-called Etagierungen. These are within the downpipes built knees, which are to prevent that the water flows freely from a height through the line and thus strikes with great force at the lower end of the line, which damage the pipeline would be unavoidable. These Etagierungen make difficulties for the rehabilitation of such pipes, as they are not easy to overcome. According to the invention, this difficulty has been overcome by the application body is compressible substantially, allowing it to adapt to the given by the Etagierung turns in the pipeline and pass this.

Preferably is used as the application body is a foam body. Such a foam body for the demands that are placed on application body in the rehabilitation of pipelines, which are drop tubes, sufficiently compressible. Since the foam body in the movement direction preferably has a larger extension than perpendicular to the direction of movement, and particularly preferably has a substantially oval cross-section, the resulting between the inner wall of the pipeline and the application body friction enables a slow sliding of the Auftragekörpers through the pipeline, while nevertheless the liquid column enough can be kept large, in order to ensure in particular in the coating of which opens into the pipeline branches that sufficient coating composition can run into the (the) confluent branch tube (s).

In a preferred embodiment of the invention is used as a coating agent, a liquid epoxy resin. This usually distinguished by the fact that they are self-curing.

In a further embodiment of the method of application body is also moved to the acting gravity at least partially by means of a drawing and / or pushing device through the pipeline. Here is the traction device that can be for example a cable or a chain, attached in a conventional manner on the application body. The force acting on the application body tension is supportive to the taking place by taking advantage of gravity movement of Auftragekörpers through the pipeline. As a pusher, a push rod is preferably used, which has the advantage that it need not be attached to the application body.

Moreover, a retaining device may be provided by which the movement of the Auftragekörpers is stopped through the conduit for a defined period of time. This may be advantageous if the pipe has severe cracks to ensure a vollständigs possible filling these cracks with the coating agent here. In addition, such a halting of the movement of the Auftragekörpers then be advantageous if branches are reached, because then the coating agent has sufficient time, running into the appropriate branch tube.

According to the invention it can be provided that the application body repeatedly, preferably, particularly preferably moved twice three or four times through the pipeline. This can be individually and depending on the coating material used in each case, the layer thickness, with the pipe inner wall is lined adjust.

Depending on the need for remediation of the pipeline, it may be necessary that the movement of Auftragekörpers is preceded by the pipe, a cleaning step and / or a treatment with deep base. Treatment with Deep Primer can then be ensured that possibly after the cleaning step may still be present, derived from the purified inner wall of the pipeline dirt, rust or soot particles bound and held, and thus adhesion of the coating composition is not prevented on the inner wall ,

In a preferred use of the inventive method can pipelines, consisting of sections of different diameters, are remediated. In this case, the application body being so dimensioned that it completely fills the clear cross section of that part of the pipe section which has the largest diameter. Due to the compressibility of the Auftragekörpers it is then ensured that compressed at the transition to the portion with a smaller diameter portion of the application body and can be carried out also by the part section having the smaller diameter. This applies if initially a section with a smaller diameter must be remedied, to which a part of larger diameter section connects. In this case, the application body can expand then where ever it should be ensured that the application body is dimensioned so that it fills the clear cross section of the section with the largest diameter throughout.

The invention is explained in the following description with reference to the attached drawings, wherein:

Show it:<dl id="dl0001"><dt>Fig. 1</dt><dd>a section schematically shown in simplified form and by a pipe with a Etagierung, wherein the coating of a pipeline section, open into the junctions, is illustrated</dd><dt>FIG. 2</dt><dd>one of Fig. 1 for conformity with picture, but the taps are already coated.</dd></dl>

In Fig. 1, a pipe 1 is shown in the form of a dipleg, as they are particularly to be found in buildings. In this pipeline 1 two branches open 2. To rehabilitate the pipeline 1, it can be first cleaned and then fitted with a low base. Treatment with Tiefgrund possibly existing, loose dirt, rust or soot particles are bound and held that could prevent adhesion of the coating material on the inner wall of the pipeline 1 otherwise. The subsequent coating is not adversely affected by the treatment with deep reason because this draws completely into the ground. Then, an application body 3 is preferably introduced via the usual with drop tubes, not shown in the drawing in the vent pipe. 1 As application body 3, a foam body is used preferably, which, having a greater extent in the direction of movement, which is characterized in the figures with an arrow, as perpendicular to the moving direction and preferably has a substantially oval cross section. The material for forming the Auftragekörpers 3 is not limited to foam. For the application of the method of any training Auftragekörpers is concerned, which guarantees its compressibility. The application body 3 fills the clear cross section of the pipe 1 from the whole. At which the direction of movement opposite boundary 5 of the Auftragekörpers 3 is now a low viscosity coating composition, preferably a liquid, selbstaushärtendes epoxy resin applied in the form of a liquid column. 7 The height of the liquid column 7 is doing just chosen so that taking advantage of the gravity of the friction Auftragekörpers 3 just so far overcome at the Rohrleitungsinnenwandung that the application body 3 is moved in the desired speed through the pipeline. 1

In the rehabilitation of pipelines 1 are basically the opening into these junctions 2 particularly problematic because these branches 2 should likewise be rehabilitated in a finite Part above the confluence with the pipeline 1 by applying a coating at least. The inventive method this partial restoration of the branches 2 in a strategic, easily is possible in that the liquid column 7 forming coating agent if the application body has 3 passes the mouth of the branch 2 in the pipeline, steps into this branch 2, upon subsequent downward movement of Auftragekörpers 3 together with the liquid column, which is still in the pipeline 1, sink and so flow out of the junction. 2 What remains both a coating 9 of the inner wall of the pipe 1 and in each case a coating 9 'of the inner wall of each of the branches 2. The size of the coated in each branch 2 subsection may vary depending upon the pitch of the liquid column 7 in the fork. 2

Pipes 1, which are designed as downpipes, as a rule on so-called Etagierungen eleventh These are within the pipe 1 provided knees that prevent the free fall of the current flowing through the pipe 1 water so that no damage occurs by the force of the other incident at the end of the pipeline 1 water. This Etagierungen complicate the restoration of attached buildings in pipelines 1 significantly. However, the application body 3 according to the invention can be easily performed by those trained as knee Etagierungen 11 because he is the one taking advantage of gravity moves through the fluid column 7 down and secondly because of its compressibility can adapt to each bent portion of the Etagierung 11 ,

In one development of the inventive method is not shown in the drawing of the application body 3 is either at its in motion direction limit in a conventional manner with a pulling device, such as a cable or a chain, connected, or on the direction of movement opposite boundary 5 of Auftragekörpers 3 engages a pusher in the form of a push rod, whereby the application body 3 is moved in addition to the acting force of gravity through the pipe first This additionally acting pulling or pushing forces may be used within the entire to be rehabilitated pipeline 1 or only on one portion of this pipeline. 1 The latter is for example advantageous when a particularly difficult area of ​​passing pipe is achieved.

Furthermore, the movement of the Auftragekörpers 3 can be stopped by the pipeline 1 by means of a not shown in the drawing holding device for a defined period of time. The holding device used in this case can be just formed as the pulling device described above, but with the difference that it is then attached to the moving direction of the opposite limit of 5 Auftragekörpers third Then, the same device can be used as holding and another time as a traction device once. but it is also possible to use as a retaining device a rod is inserted from below, for example the a cleaning opening into the pipe. By means of this holding device the application body 3 is stopped in its movement through the pipeline 1 in such areas for a defined period of time, where pronounced cracks and / or branches 2 are present. Then, the coating agent has time to fully penetrate the cracks or branches in the 2 or.

When liquid epoxy resin, which is used as a coating agent in the rehabilitation of the present invention, commercially available liquid epoxy resins can be used. In order to ensure thereby a sufficient coating of the inner wall of the pipeline to be rehabilitated 1, it is preferable to repeatedly apply the inventive method. It has proved to be particularly favorable, the method applied three or four times, caused by the fact that a low-viscosity, liquid coating composition is applied. The rehabilitation of the respective pipeline 1 by leading skilled has the option to vary in the repeated coating operations between coating operations alone taking advantage of gravity and those in which simultaneously a tensile, shear and / or holding device is used, depending on as it requires the pipeline to be rehabilitated. 1 It has proved advantageous that the last coating pass without tensile, shear and / or holding device is performed.

A particular application of the restructuring process of the invention lies in the rehabilitation of pipelines 1, consisting of sections of different diameters. The procedure is to be in the manner described above, whereby it must be ensured that the application body is just 3 dimensioned such that it completely fills the clear cross section of the sub- section of pipeline 1, which has the largest diameter. Due to the compressibility of the Auftragekörpers 1, it is then ensured that compressed at the transition to the part with the smaller diameter portion of the application body 1 and can be carried out also by the part section having the smaller diameter. This applies if initially a section with a smaller diameter must be remedied, to which a part of larger diameter section connects. In this case, the application body 3 can expand then where it must again be dimensioned such that it still completely fills the clear cross section of the partial section with the largest diameter.

Another application of the method is in the range of food-producing companies or catering establishments. In these areas, guaranteeing the freedom of vermin is a seites forcing other hand problematic. It is possible that especially older pipelines although per se are not in need of renovation, but have a rough inner wall. Pests, especially cockroaches frequently occurring in the food industry, are able to pass these rough inner walls of pipelines 1 and are therefore difficult to control. After applying the restoration process of the invention, however, an essentially smooth inner wall is ensured at which said pests can no longer move.

The restoration process of the invention is not limited to use with drop tubes, but can for example also be used in inclined base lines. It should only such a gradient of the respective pipeline 1 to be present, that allows the use of gravity, without requiring an excessively large height of the liquid column, which then, due to the necessary amount of coating agent is no longer economical.

The inventive method is not limited to substantially circular pipes, but can also in other lines with non-circular cross-section, such as chimneys, are used.