VERFAHREN ZUM AUSTAUSCH EINER IM ERDBODEN VERLEGTEN ROHRLEITUNG

摘要

A method of replacing an old buried pipe (1) with a new pipe (9) comprises attaching a temporary pipe (5) having an external diameter which is substantially the same as the new pipe to the rear end of a bursting mole (4) having a cylindrical body whose external diameter is larger than the old pipe, impulsively moving the mole forward so that a head of the mole intrudes into the old pipe and bursts it to provide an enlarged space for receiving the temporary pipe following the mole, applying the new pipe to one end of the temporary pipe, and withdrawing the temporary pipe such that it is progressively replace by the new pipe. <IMAGE>