Downpipe rehabilitation whilst
business continue at a holiday complex

Bad Harzburg

The hose lining method for wastewater pipes is not (yet) widespread in Germany. One company that already has many years of experience with it is CANN’A’QUA Kanalsanierung from Bad Harzburg. The rehabilitation service provider faces challenges such as small nominal diameters from DN 50, dimensional changes and bends of up to 90 ° inside buildings without chiselling and de­molition work., with the appropriate technology and expertise. For this, they rely on the BRAWOLINER® from BRAWO® SYSTEMS.

In Bad Harzburg, the team of Managing Director Michael Filek was able to prove itself during the downpipe rehabilitation in the ongoing business of a holiday complex.

Construction site report

Since the rehabilitation of the apartment blocks took place during the ongoing holiday business, restrictions and disruptions for the residents thus had to kept as brief as possible. Thus, each day had to run exactly according to plan, so that residents had to do without the drainage system between 8 am and 4 pm at the most.

Beforehand, new inspection openings were fitted in some intermediate floor levels in accessible areas; this served the experts to check during the inversion process and to position and introduce the cutting robot to open the inlets. For further preparation, the residents were informed about the period of the work and the wearing of body cams by the rehabilitation service providers. In addition, the construction site was set up in advance with the hoses and equipment for the liner installation, the steam unit, the compressor, the inversion unit and the emergency compressed air unit. A cleaning and final inspection of the pipelines was carried out the day before.

After the BRAWOLINER® HT had been soaked and rolled to the required wall thickness on the day of rehabilitation, the inversion was carried out from the roof from top to bottom. The process was completed as soon as the liner arrived at the endpoint on the bottom floor. The curing of the liner was done by steam. During the cooling phase, the hose liner was cut off flush at the starting point and at the inversion end and the pipes could be reconnected to the drainage system.

In the intermediate floors, the inspection openings were opened with an angle grinder, and the hose liner was sealed at these points with a special silicone. With the help of the cutting robot, the connections in the downpipes were opened. As soon as an inlet was opened, the residents could put the drainage system back into operation.

Key data of the project

  • Project period: 2016 to 2018.
  • Complex built in the 1970s with three apartment blocks and about 400 freehold apartments. The apartment blocks have 16 storeys with a total height of up to 55 metres.
  • Rehabilitation of 9 downpipes of up to 50 metres and 26 inlets per downpipe.
  • Pipes in diameters DN 100 and DN 125.
  • Damage: Steel pipes with cracks and severe corrosion in the area of the pipe connections.
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