Jack methods for DN 200 pipes
Microtunnelling of DN 200 main sewers
The steered method of producing house connections from main sewers by the pilot jacking pipe technique is also used for constructing small DN 200 main sewers underground with manhole to manhole lengths up to 60 m. An overall more robust version of the equipment makes this work possible. The use of this simple technique enables microtunnelling to be offered very competitively so that it gives cost advantages over the open trench method even at shallow depths of laying.
By expanding in stages with the aid of an enlarging cutting head for DN 250, DN 300 and DN 400, microtunnelling of short manhole to manhole lengths can also be carried out in these nominal sizes by this pilot jacking pipe method.
Crossing under lines of German Railways
KERAMO-STEINZEUG's vitrified clay jacking pipes in nominal diameters of DN 250, DN 300, DN 400, DN 500, DN 600, DN 700 and DN 800 have general approval for crossing under lines of the German Railways. For nominal diameters DN 150, DN 200 and DN 1000 approval has to be obtained for each individual case of application. The foundation for the granting of approval are the test regulations for vitrified clay jacking pipes laid down in DIN EN 295 and RAL RG 534 VT (i.e. fatigue strength under pulsating load).