Tiefbau einschließlich Leerrohrverlegung

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Lot 1: civil engineering and duct installation The routes to be installed consist, as a rule, of 2 systems of 110 kV lines with one duct of 250 mm outer diameter per phase. The ducts are installed in a triangular configuration. Furthermore, 2 ducts DN 110 are installed in the trench, into which, at a later point in time, earthing conductors and fibre-optic cables will be pulled in. The standard trench is typically 2.0 m wide, plus trench supports and 1.6 m depth. The 110 kV ducts are each installed from the center of the trench at a distance of 25 cm, outer edge of the duct assembly. Due to special local conditions, the dimensions may deviate, particularly with regard to the installation depth. Lot 2: HDD wash drilling procedures As an additional installation technique, the HDD wash drilling procedure may be used. The reaming dimensions for HDD wash drilling range from 650 mm to 800 mm. These depend on the drilling lengths. Lot 3: pipe jacking Pipe jacking is predominant for crossings with the railway tracks of Deutsche Bahn AG. The jacking length is from approx. 30 m. The outer pipe diameter is from approx. 800 mm. In pipe jacking, obstacles (road, waters, cable route, railway…

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