To set the piping automatically and surely hold and center the piping, by comprising a pipe inserting device into which a clamped new piping can be inserted and positioned, between a pair of existing pipings.

A piping inserting device 40 is moved in the axial direction of the existing pipings 3, 4, by turning a remote bolt 32, for performing the adjustment of position in the axial direction, of the new piping 39 clamped by the piping insertion device 40. A point of a torque tube of an external electric impact wrench, is fitted to a remote bolt 56 of a lateral direction positioning mechanism 43, and the positioning of the new piping 39 in the rotating direction is performed by turning the remote bolt 56. Further the point of the torque tube of the external electric impact wrench is fitted to a remote bolt 55 of a vertical direction positioning mechanism 42, and the positioning in the vertical direction, of the new piping 39, is performed by turning the remote bolt 55. Thereby the centering of the new piping 39 can be simultaneously performed to the both existing pipings 3, 4.