To provide a piping technique using a combination of a device and a leading vehicle which stabilizes the travelling performance and the condition of a pipeline, strong enough to endure force to be generated to the outside of the curves of the ductile cast ion pipes during curved piping, for securing a space for a joint to be mounted for connecting ductile cast iron pipes in a method of independently piping the ductile cast iron pipes into fume pipes to be used as sheaths.

Pipes are assembled in a shaft 8 to secure connection spaces. Thus, supporting materials 4, travellers 5 and casters 7 are used for reliable piping in the pipeline including curves.