| 摘要 |
<p>PURPOSE:To provide a method for lining the inner face of a pipe capable of avoiding the defects such as the gas accumulation likely to generate at the set part of the joint or the pinhole resulting from the accumulation at the time of lining the inner face of a pipeline formed by communicatively connecting plural ducts with a coupling provided with an external juncture on both ends with a pig. CONSTITUTION:A second pig 4 having a diameter smaller than that of a first pig 3 is used to send a lining agent 2 under pressure to preliminarily extend the agent, and the preliminarily extended agent 2 is further extended by the first pig 4 in a specified manner.</p> |
