To provide a method of cleaning a tube inner surface capable of reliably recovering a cleaning member from a reaching-side branch tube.
The method of cleaning a tube inner surface includes: inserting a cleaning ball 22 into a water pipe 1 from a departure-side branch tube 1, causing water W to flow in the water pipe 1 to transfer the cleaning ball 22, thereby cleaning the inner surface of the water pipe 1 with the cleaning ball 22, and recovering the cleaning ball 22 from a reaching-side branch tube 8. A capture jig 27 is inserted into the reaching-side branch tube 8. The cleaning ball 22 reaching the reaching-side branch tube 8 from the departure-side branch tube is captured by the capture jig 27. The flow in the water pipe 1 is blocked to remove and draw the capture jig 27 from the reaching-side branch tube 8, and the captured cleaning ball 22 is recovered from the reaching-side branch tube 8.
ISHIHARA TAKAHIRO
TAKAHASHI SHINPEI
Yoshihiro Morimoto