An innovative rehabilitation method

The pipe-in-pipe system

Fig. 1 Epoxy-resin pipes being resistant to bending at the
insertion shaft for the installation at a test track in Düsseldorf.

Fig. 2 Factory-provided control of permeability.

Fig. 3 Simulation of the installation in the factory of DW Betonrohre GmbH.

Fig. 4 Factory-provided installation test with representatives of the municipal drainage company and the construction company.

Fig. 5 Preparatory work for the house connections with the aid of state-of-the-art robotics.

Fig. 6 a and b Measurement and documentation of the house connections by the building owner.

Fig. 6 a and b Measurement and documentation of the house connections by the building owner

Fig. 7 The pipe severely damaged by corrosion before rehabilitation.

Fig. 8 a and b The bending resistant pipes are easy to install despite the confined space

Fig. 8a and b The bending resistant pipes are easy to install despite the confined space.

Fig. 9 Compressor with hydraulic rope winch at the receiving shaft. The narrow road could be passed at any time.

There is an urgent need for rehabilitation or complete renewal of an increasing number of water and sewage pipes due to old age and/or owing to aggressive attacks. Apart from using collection drains and sewers, rehabilitation methods are required that are not just a kind of bricolage but may provide an efficient and permanently tight solution even in case of highest demands.

Epoxy concrete with positive material properties

In search of different rehabilitation methods using mineral building materials as an alternative to the renewal of sewers and to conventional liners, the engineers of the municipal drainage company of the city of Düsseldorf discovered a solution at DW Betonrohre GmbH, Dormagen (Germany). As a result of extensive development work this company was able to design a bending resistant pipe-in-pipe system made of epoxy resin concrete (DW-EP-PIPE) being assessed very positively by official testing centers as well as, amongst others, MFPA Leipzig and TH...