The tunnel Hirschhagen is a tunnel on the German freeway 44 in Northern Hesse. The tunnel’s name origins from the nearby village Hirschhagen. After its completion tunnel Hirschhagen will be the second largest tunnel on a German freeway.
The complete tunnel has been equipped with a sealing system according to ZTV-ING, using an unplasticised VLDPE geomembrane, in 3mm thickness with long-term durability. Due to the extremely high hydrostatic strain (high water pressure), an additional inspection and injection system has been installed. This system allows for retroactive leak testing as well as easy repair and maintenance. Further components of the sealing system are the protection geotextile with a minimum grammage of 900g/m², the fixing rondelles with approvedpre-determined breaking point and six barwaterstops.
All sealing work has been carried out by NAUE Sealing GmbH & Co. KG. A quality controlled, certified specialist for tunnelling sealing systems according to the requirements of DVS 2225-5.