- Home
- Companies
- Ludwig Pfeiffer Hoch- und Tiefbau GmbH ...
- Services
- Trenchless Pipe Replacement
Trenchless Pipe Replacement
Pressing/drawing method in accordance with GW 322-1 The Pilot Pipe method is a procedure developed and patented by the Pfeiffer Group, designed for trenchless pipe replacement within the drinking water and gas pipe sector. As part of this method, old pipe is completely removed from the ground and the new pipe is drawn into the same line. The Pilot Pipe method can be used for old pipes consisting of cast-iron, steel, fibre cement, prestressed and reinforced concrete pipes, in nominal widths ranging from DN 80 to DN 1600. Pipes made of steel, ductile cast iron, PE and materials guaranteeing similar tensile strength can be used for the new line. In contrast to other methods available on the market, this method enables substantial nominal width increases (as well as reductions); it is suitable for installation lengths of 60 - 80 m without intermediate trenches.
The advantages
Pipes can be easily replaced without destroying valuable surfaces – also in the immediate vicinity of trees. The reduction in earthwork and the small space requirement mean that disruption for residents and traffic is considerably reduced, in comparison with an open construction method. Thanks to the special features of this method, complete salvage of the old pipe is possible, i.e. no environmentally harmful materials are left in the earth. In contrast to other methods, the new pipe is supported in a bed of earth, without any broken fragments from the old pipe. With possible replacement lengths of 60 - 80 m (without intermediate trench), the necessary excavation is limited to launch and exit trenches. There is no risk of damage to crossing pipes, as the old line is used for the new pipe. Nominal width increases or reductions are possible without restriction.