This Case Study was originally published in the German civil engineering publication bi-UmweltBau. The following is a paraphrased version in English.
In Dortmund, Germany, the Civil Engineering Department’s Urban Drainage unit maintains an approximately 1,200 mile long sewer network. Everyday maintenance and repairs are carried out in the system routinely.
In 2007 significant damage to an existing combined sewer line in Dortmund was revealed by a CCTV inspection. The 10” clay channel laid in the access road Wilsingweg was built in 1914. A renovation was necessary because the structural material has been worn out over the years. In addition, the structure is 200 feet long with a slight slope so that sewage drains poorly. A replacement of the structure is only possible if the receiving pool was also adjusted. Unfortunately this is connected to an intersection of Federal Highway 1, which is the busiest road in Dortmund, Germany. Replacing the line was not an immediate option.
To prevent further damage to the existing canal, it was decided to make a repair with QuickLock sleeves to the 12 most severe individual damages so the channel can continue to operate until the proper repair of the line could be planned and funded. The repair was carried out in April 2007 over two days and completed to the full satisfaction of the network operator.
However, the existing counter slopes and the associated accumulation of waste water at the beginning of the pipe structure requires a weekly vacuuming of debris and a high-pressure flushing of the entire line. After more than three years and around 150 high-pressure cleanings of the line with a 1450 psi nozzle, the QuickLock sleeves have neither changed in their position nor shown wear and tear on the materials.
The network operators of the waste-water team in the city of Dortmund are satisfied with the QuickLock repair method and will continue to use this in the future where appropriate conditions apply. The special circumstances have documented the flushing strength of the QuickLock sleeves in a very unique way in this case.
Original Press in German: PDF download here