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NEWSDESK


In order to place theGRUNDOBURST800G


into position inside the starting pit, a segment of the asbestos-cement pipe, situated at a depth of 1,50mwas sawn out and disposed of


Old path, new pipe and even more capacity


Renewal of an asbestos cement sewage pressure line with GRUNDOBURST 800G


The Lower Rhine town of Korschenbroich lies between the metropolitan areas of Mönchengladbach, Krefeld, Neuss and Düsseldorf in the west of Germany.Despite the growing population, Korschenbroich with approximately 5.500 ha has never lost its countryside character in all of its districts. After all, approx.68% of the total area are used for agriculture, just under 22% are residential, commercial and transport areas, the rest divided into recreational, forest and water areas.


For the many bodies of water in ditches, hollows and streambeds, with or without pipes, as well as for a large part of the sewers, the municipal wastewater company (SAB) bears the maintenance obligation. The waters in the urbans North Canal and Glehn, various sewage canals and sewage pumping stations, as well as two sewage treatment plants, are the exceptions. They are operated, maintained and serviced by the water management association ‘Erftverband’. As a public corporation, they are a non-profit organisation, with a focus on an environmental and public welfare, supported by about 250 members.


Old pipehas massivele aks


The Erftverband association operates a sewage pumping station (pump house and rainwater overflow basin) in the Korschenbroich region of Liedberg. From this pumping station the resulting dirt and rainwater is transported via an approximately 840mlength pressure pipe along the main road “L382” up to the crossing B230/L382 and from there guided via the canal to the wastewater treatment plant in Glehn.


After being in operation for about 40 years this pressure pipe urgently needed renewing.


20


Strong roots ingrowing and last not least, the ravages of time had clearly left their marks. Rough cracks, connection and socket damages, as well as damages caused by corrosion, had increasingly lead to leakages and therefore regularly causing flooding on the adjacent properties of the local residents. The Erftverband acted quickly and contacted the Engineering company Dr. Ing. Naken GmbH in Aachen, to carry out the necessary planning tasks and made the guidelines clear: renewal of the pipe with the closed, trenchless construction method by applying the pipe bursting method and upsizing the diameter of the pipe by two nominal widths; the contract for the execution was awarded to Alfes + Sons GmbH from Wenden in the Sauerland region.


Safety preparations


At the beginning of May 2020, the preparations for the application of the pipe bursting method on the 840mlength pressure pipe on the second section have been carried out. The pressure pipe was temporarily shut down, the starting and target pits set up and the new PE pipe length for the current section over 150mis lying ready to be installed. A day earlier the Alfes team had already sawn off and disposed of a segment of the asbestos-cement pipe at a depth of 1,50 m, so that the GRUNDOBURST 800G could be set-up inside the starting pit. Very professional of course, taking all applicable safety guidelines and precautions into account.


Trenchless pipe renewal professionals


Managing Director Gerhold Alfes has come to the site himself and would even love to lend a hand. His company with 30 employees have been specialising in pipe renewal using the TIP method, pipe relining and pipe bursting for many years and are now among the


| March 2021 | www.draintraderltd.com Inserting the bursting rods is quick and easy


Pushing the QuickLock rods through the old pipe


leading German companies in the trenchless pipe renewal and pipe rehabilitation field. “The Erftverband”, according to Gerhold Alfes, “had very clear ideas regarding this construction task. In order to protect the trees along this road, the directly adjacent cultivated fields, the meadows and of course,


After 150mthe rod string arrives in the pipe installation pit


the local residents, anything other than the underground construction method was out of the question. Also, with a total distance of 840 mthe time factor, the protection of the surface, as well as the road surface and the unrestricted access to the L382 road, played a substantial role.”


The Erftverband made the decision to apply the pipe bursting method, where the old pipe is broken apart with a burst head and radially


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