Pipe relining, pipe pulling

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Pipe relining, pipe pulling

Pipe relining methods used by SYCONS Ltd. are useful for waterproofing rainwater lines and gravity-sewers and - in some cases - to increase their load-bearing capacity without altering their path, at the cost of decreasing their inner diameter.

Relining with spirally wound PVC inliner pipes (insitu inliner pipe production)

This type of pipe relining technology sidnificantly improves the hydraulic characteristics, with only a minimal decrease in inner diameter of the existing sewers or rainwater lines. It is possible to reline a pipeline using the existing sewer manholes with a diameter of at least 100 cm as starting shaft.

The PVC inliner pipe is wound in the field using a special ribbed-profile plastic tape, by a winding machine lowered to the sewer manhole. The profiles are interconnected by glued joints.

With this process we are able to construct a long, waterproof and chemical-resistant inliner pipe in an extremely short time. The small annulus that is present between the walls of the inliner and the outer pipe is grouted with cement-foam, this way fixing the pipe in its place and ensuring radially symmetrical support. Grouting also fills incidental soil cavities near the damaged sewer pipe, this way preventing future cave-ins. It is also possible to set the position of the inliner pipe to touch either the bottom or the top of the old sewer pipe, This way we can reduce the observed inequalities present in the alignment of the pipeline.

With this method so far we have managed to restore over 17.000 m etersof sewer lines, with diameters ranging from Ø200 to Ø800 mm.                                                                                                                                 

With the use of spirally wound PVC inliner and grouting it is possible to achieve a small improvement in the decreased load bearing capacity of a damaged sewer as well.

Pipe pulling

Whenever our first priority is increasing a pipeline’s load-bearing capacity, rather than keeping its diameter – that might not be necessary due to hydrologic circumstances - the application of the pipe-pulling method is advisable – laying a new pipe with high load-bearing capacity inside the old one.

This technology can be applied for the reconstruction of high-pressure water conduits as well.

The pipe-pulling procedure provides a trenchless method for the restoration of fractured or slightly cracked, circular pipelines with inadequate transporting- or load-bearing capacity.

We need two small pits at each end of the pipeline section that needs to be reconstructed, which – in case of short-section lining by pulling – can be the existing sewer shafts, if they have an inner diameter of at least 100 cm. Reconstruction can be started from these shafts, by the flushing of the old pipes.

For relining with pipe-pulling we use either short pipe sections or long, flexible pipes available in reels, depending on the diameter, the conditions on site and the material of the new pipe. The short pipe sections are interconnected with hidden muff couplings and a pair of rubber O-rings. This alternative is applicable only for reconstructing gravity pipelines. The material in this case is either hard PE or PVC.

In case of high-pressure pipelines we apply hard PE sections that are interconnected with butt welded joints.

The annulus remained between the two pipes should be grouted.

The application of this technology is independent of weather; pipe pulling can be conducted during wintertime as well. Pipe pulling is a trenchless technology, it doesn’t disrupt the surroundings. Slightly faster and more economical than the open cut reconstruction methods.