Dynamic Drive
Dynamic pneumatic rams can drive steel pipes with a diameter of up to 4,000 millimetres over a length of up to 80 metres through ground classes 1 to 5. Pipe driving in ground class 6 may also be possible. In spite of the high impact energy of up to 40,000 kN, no extensive and space taking abutments are necessary.
Up to 10 Metres per Hour
The quick driving of up to 10 metres per hour with simultaneous intactness of the surface as with damns, rail units or streets guarantees a much shorter and mostly much more economical execution of the construction in comparison to an open method of construction. Since the in-situ ground core is not displaced, but rather remains in the driving pipe during the ramming, a collapse of the heading face is not possible. An additional great advantage is that the overlapping of the pipe cannot amount to more than the outer diameter of the pipe. This is, of course, strongly dependent upon the in-situ ground as well as upon the utilisation of the surface.
Up to 80 Metres into the Ground
After the ramming has ended, the earth core found in the pipe is removed from the pipe by means of pneumatic, hydraulic or mechanical procedures. Installing the necessary pipe into the steel pipe occurs dependent upon the pipes diameter either by drawing it in or pushing through hydraulically. The annular gap, which arises between the used pipe and the driving pipe, is plugged and thus held in its horizontal position.
The UHRIG System
Since the horizontal precision for conventional pipe driving is mostly not producible, the steel pipe in the starting shaft is laid in a half-circle, moulded pipe bedding. This is produced by means of laser technology in exactly the planned grade and thus guarantees a much higher probability for success than conventional driving systems.
