Renovation of Sewerage System Interceptors and Connection to Treatment Plant in Torun

The project involved renewing the sewerage system interceptors and connecting them to the treatment plant by a route which however crossed the botanical gardens, one of the most environmentally sensitive areas in the city. To avoid damage to the park, the municipality decided to use the microtunneling installation method with HOBAS® centrifugally cast jacking pipes for that section. This technology had never been used in Poland before. Apart from the benefits of minimizing disturbance along the route of the pipeline, under the tram lines and through the sensitive park areas, the trenchless method also met the other project target of reducing traffic disruption. During installation of the HOBAS® CC-GRP Pipe System, the average jacking force was about 300 tonnes with the maximum remaining under 500 tonnes. Remarkable precision was achieved during the microtunneling operation where deviations of less than 25 mm in both the horizontal and vertical axes were achieved.