| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate the inconvenience that time and considerable cost are needed for the coating repair of the whole inside of a rehabilitation pipe. SOLUTION: A pig for repairing is provided with a main body 1 formed into a short and cylindrical state from an elastic synthetic resin and a nearly conical part 2 integrally formed on the front end of the main body 1 and is constituted so that many metal made pins 3, each having a head part 4 exposed outside from the circumferential surface of the main body 1, are arranged zigzag with a certain interval in the axial direction on the circumferential surface of the main body 1, which has the width in accordance with the purpose of the grinding of a conduit.</p> |
