Tiefbau einschließlich Leerrohrverlegung

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Lot 1: Civil engineering and duct pipe installation The routes to be installed typically consist of 2 systems of 110 kV lines with a duct pipe of 250 mm outer diameter per phase. The duct pipes are laid in a trefoil arrangement. In addition, in the trench 2 duct pipes DN 110 are laid, into which earthing cables and fibre-optic cables will be pulled in at a later time. The standard trench is typically 2.0 m wide, plus shoring and 1.6 m deep. The 110 kV duct pipes are each laid from the center of the trench at a distance of 25 cm, outer edge of the pipe assembly. Due to special local conditions, the dimensions may differ, particularly with regard to the installation depth. Lot 2: HDD pilot-hole reaming procedures As an additional installation technique, the HDD pilot-hole reaming procedure may be used. The reaming expansion sizes for the HDD pilot-hole reaming lie between 650 mm and 800 mm. These depend on the drilling lengths. Lot 3: Pipe jacking The pipe jacking method predominates for crossings with the railway tracks of Deutsche Bahn AG. The jacking length is from approx. 30 m. The outside pipe diameter is from approx. 800 mm. In pipe jacking, obstacles (roads, bodies of water,…

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