Great challenges

In 2008, Aarsleff Pipe Technologies carried out a project in Odense which involved a number of special challenges. 

It started with a standard inspection of a sewer section of a DN1,000 mm collector situated in the Odense river, under a railway bridge. The pipe had several leaks. And so did the neighbouring stretch. At the same time, the access conditions to the nearest manholes were very poor. The solution was a 311-metre-long Aarsleff CIPP Lining weighing approx. 40 tons and causing great challenges during transport. Also, we had to transport 30 tons of ice for cooling of the liner to avoid premature curing.

In order to install the Aarsleff CIPP Lining, we established by-pass pumping. We moved 350 l/s approx. 850 m by means of two ø400 mm PE pipes along the river, under the railway bridge and over the river via a temporary bridge scaffold that allowed canoeists to pass while the renewal work was carried out. Finally, the PE pipes also ran across a lake. 

When the large Aarsleff CIPP Lining was ready to leave our factory, new challenges arose. It turned out that the heavy infiltrations took in so much sand that the final cleaning of the pipe was extremely complicated. It caused a minor delay and great efforts to ensure that the liner was constantly cooled down correctly. After a weekend of hard work, we were able to install the huge liner from a scaffold near the watercourse. The installation lasted 12 hours. We had to make a 7-metre-tall water column to handle the installation and create sufficient counter-pressure.
After 48 hours, the installed liner was cured and cooled down, and we were able to complete the job with a CCTV inspection and connection of the pipe to the remaining part of the system.