PIPING CUTTING METHOD, PIPING CUTTER AND CONTROL METHOD OF PIPING CUTTER

To provide a piping cutting method which can process piping without causing a malfunction with respect to existing piping in which a protection member is arranged so as to cover a diameter outside part of the piping, a piping cutter and a control method of the piping cutter.SOLUTION: A piping cutting method of this invention using a piping cutter having a cutting part 13 for cutting a wall thickness of piping at existing piping 8 in which a protection material 9 is arranged so as to cover a diameter outside part of the piping 10, and gas flow-in means for making a gas flow into the piping includes: a sending process for moving a cutting part to the other end side from one end side of the piping in a pipe axial direction, and removing a wall thickness of the piping between portions at which the cutting part moves to the other end side from one end side; and a return process for moving the cutting part to one end side from the other end side. A gas is made to flow into the piping by the gas flow-in means at a time except for a time at which the cutting part in at least the sending process out of the sending process and the return process cuts the piping.SELECTED DRAWING: Figure 5 【課題】配管の径外方を覆うように保護材が設けられる既設配管に対し、配管を不都合なく処理することができる配管切削方法、配管切削装置、及び、該配管切削装置の制御方法を提供する。【解決手段】本発明の配管切削方法は、配管１０の径外方を覆うように保護材９が設けられる既設配管８における配管の肉厚切削する切削部１３と、配管の内部に気体を流入させる気体流入手段と、を備えた配管切削装置を用いた配管切削方法であって、切削部を前記配管の管軸方向の一端側から他端側に移動させ、切削部が一端側から他端側に移動する一部の間に配管の肉厚を除去する送り工程と、切削部を他端側から一端側に移動させる戻し工程と、を含み、送り工程及び戻し工程のうち、少なくとも送り工程における切削部が配管を切削している間を除く間に気体流入手段で配管の内部に気体を流入させる。【選択図】図５