Method for reducing the friction between the outer surface of a pipe wall and the surrounding ground involves separation of the pipe wall in axial direction, and rotation of the separation tool

摘要

The method for reducing the friction between the outer surface of the wall (5) of a pipe (2) and the surrounding ground (1) involves division of the pipe wall in axial direction, and rotation of the separation tool (10) to produce a separation gap which runs along a helical line in the pipe wall. Also claimed is an apparatus for implementation of the method.