METHOD AND APPARATUS FOR CONDUCTING OPERATION IN PIPE

摘要

A method and an apparatus for conducting predetermined operations in the interior of a pipe (12) with working means (20,20a,108) are disclosed, in which the working means is shifted so that a rotary axis (19) of the working means is angularly displaced about an axis extending along the pipe and is displaced in the axial direction of the pipe while the working means is rotated about an axis extending in the axial direction of the pipe or about an axis extending in the radial direction of the pipe.