Efficient Relining with HOBAS NC Line

The gravity and scope of damage had to be evaluated in order to determine which measures were to be taken and what should be prioritized. Sewer renovations ask for tailor-made solutions where local circumstances play an important role. Since repairs did not solve the problem, relining or the replacement of the sewer had to be taken into consideration. The latter option would have called for the destruction of the complete existing line in open trench whereas with relining the old structure would remain. The idea of replacing the sewer was soon set aside for it posed technical as well as implementation problems. Moreover it would have been the most costly method. Basing the decision on the analysis, Tilburg chose prefabricated reinforced plastic (GRP) pipe elements to reline the whole affected section. An important precondition concerning pipe capacity was the maximal acceptable diameter reduction of 10 cm. This limited the number of sliplining methods (“lining with continuous” or “discrete pipes”). Another criterion was the length of the damaged section which does not except horizontal deviations (angle distortion) in the line.