| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To shorten working time for cleaning the inner face of a pipeline even with a large bore, and to facilitate recovering work of a device to the outside of the pipeline. <P>SOLUTION: First and second openings allowing the inside to communicate with the outside of a pipe are provided at positions with a given distance along the pipeline 1 to be washed inside, respectively. A hose 5 with a jetting head is inserted into the pipeline from the first opening 2 and the fluid in the hose 5 is jetted backward from the jetting head to run the head toward the second opening in the pipeline 1. The jetting head is removed from the hose 5 at the second opening, and a rotary washing head 20 is attached for rotating a washing instrument 14 by jetting the fluid 16 from the hose 5. While rotating the washing instrument 14, the hose 5 is drawn back to take out it from the first opening 2, to wash the inner face of the pipeline from the second opening toward the first opening 2. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
