FREMGANGSMAADE TIL RETABLERING AF UNDERJORDISKE ROERLEDNINGER

摘要

In the method, pipe pieces 17 are pressed one after the other and end to end intermittently into a pipeline 11b. An expansion spike 18 or similar broaching tool is pushed through the pipeline at the leading end of the pipe string formed by the pipe pieces and is made to expand so as to split open or, if splitting open is not necessary, to widen the pipeline so that it has an on the whole circular cross section. <IMAGE>