Successful rehabilitation using DN 1000 liners in Rheinberg
The city of Rheinberg in North Rhine-Westphalia focused on the innovative Brandenburger GFRP liner process for the rehabilitation of the sewer system. The rehabilitation project was successfully completed by our partner company KS Kanalsanierung from Freudenberg and proved the benefits of the patented UV light-curing procedure to the fullest. The sewage pipe that was damaged by cracks was completely renovated along a length of 300 metres within just seven days. Applied was the largest light-curing Brandenburger liner with a diameter of DN 1000.
Manual handling of the seamless DN 1000 GFRP inliner on the construction site in Rheinberg
The required seamless hoses, which were 296.6 meters long all together, had been ordered by the rehabilitation company ahead of time from the Brandenburger's Landau plant. The GFRP inliner's resin was impregnated at our factory and the internal foil tube was packed prewound and light-proof so that it was ready to be installed. That meant the no more chemical processes were necessary at the construction site.
View into the liner, right: The sewer pipe in the Schlossstraße following the rehabilitation - the liner form-fits perfectly in the old pipe (close fit)
Jens Riecken, the chief engineer at KS Kanalsanierung, had "serious doubts" whether the DN 1000 hose could be inserted without any problem into the narrow sewer shafts in the Schlossstraße. Doubts that could be cleared completely: "Skillful folding of the hoses on the conveyor belt made it easy to draw them in," according to Riecken. During the rehabilitation project, which was supervised on site by Peter Eschenbrenner of Brandenburger's technical service department, it wasn't necessary to remove the shaft rings, contrary to other procedures, so that time and costs could be saved. The conveyor belt could be dismantled immediately following the drawing in and employed elsewhere - this too a benefit of the Brandenburger procedure.
The light-proof packed liner is lowered into the shaft
On site the seamless DN 1000 GFRP inliner was drawn into the sewer pipe from shaft to shaft in a total of 6 reaches with 50 meters each, sealed by two special packers, expanded by compressed air, and thereby pressed seamlessly against the old pipe's walls. Then the pipe section was properly cured by the trolley-driven UV source. The curing process was monitored and documented by the technicians from KS Kanalsanierung using a TV camera and electronic control equipment. This ensures the quality and durability of the new "pipe in pipe" in Rheinberg for a long time to come.
Once the curing was completed the internal foil just had to be removed from the GFK inliner and as the final step the residential connections needed to be opened using a TV-monitored cutting robot (cutter). The sewer in the Schlossstraße could be used immediately after the rehabilitation.
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