Large-scale sewer rehabilitation

From October 2012 to May 2013, the municipal utility Hamburg Wasser (HW) [urban sewerage and sanitation] had a DN 3000 masonry interceptor in the Hamburg sewerage network repaired. Right from the tendering phase, our ombran unit was able to impress the planning engineers. Its speciality repair products were thus extensively used for the successful implementation of this, the largest single project in ombran’s history.

The origins of the public sewerage system in the Free and Hanseatic city of Hamburg extend back into the middle of the 19th century. A large portion of the sewerage structures were constructed in the form of masonry conduits, most of which have continued to perform well through to today. The only signs of significant wear and tear are in the mortar joints which are frequently found to be crumbling and prone to leakage. And it was this kind of damage that led the Hamburg sewerage and drainage utility Hamburg Wasser (HW) to initiate a full repair of a 400 metre long section of the “Kuhmühlenstammsiel” interceptor sewer in the centre of the city. The difficult conditions surrounding the project presented a number of major challenges, such as the dense transport, cabling and piping infrastructure that had to be negotiated, and also poor accessibility – the manholes were up to 100 metres apart. In two rehabilitation sections totalling 240 metres in length, the main contractor Aarsleff Rohrsanierung GmbH of Röthenbach an der Pegnitz made extensive use of the sophisticated product technologies available from ombran. The unit supported the project from start to finish, additionally providing MC’s extensive repair expertise to keep the work running smoothly.