Renovation of the water supply
Mainz-Kostheim and Ginsheim-Gustavsburg
Municipal utility company Mainzer Netze GmbH

The Hessian town of Ginsheim-Gustavsburg is located to the south of where the Main flows into the Rhine - the so-called "Mainspitze". From here, a new main drinking water pipeline is to be laid to Mainz-Kostheim, the southernmost district of the Hessian state capital Wiesbaden. The existing supply line runs under the Main bridge between the two towns and has reached its age-related wear limit. To avoid lengthy and costly installation work with unavoidable restrictions on urban traffic, it was decided not to replace the pipeline in the area of the bridge. Instead, the decision was made in favour of a cost- and time-saving new installation under the river with the horizontal directional drilling method. The bore channel required for this will be drilled using the HDD method to 26 metres below the Main river, into which a pipe made of stress crack-resistant PE100-RC will then be pulled. To ensure comprehensive and permanent protection of the drinking water against possible future contamination, the responsible network operators decided in favour of using the GEROfit^® REX permeation-tight pipe system. Once the new main line has been commissioned, including the connection of all outgoing secondary lines, the old supply line will be dismantled and the Main bridge will be renovated.