| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a covering method for a connection part of a buried pipe and a covering device, dispensing with an expensive heat shrinkable tubing, nor operation of a skilled workman, for constant and high anticorrosion quality.SOLUTION: In a covering method a connection part 5 is covered by exposing a steel pipe surface part of a connection part 4 of a buried pipe 2, for welding end faces of the connection part 4 together. A sealing casing 1 that seals an outer peripheral surface of the connection part 4 of the buried pipe 2 is disposed. An air gap part S formed of the outer peripheral surface of the connection part 4 of the buried pipe 2 and the sealing casing 1 is packed with granular objects P including thermoplastic resin. After that, the air gap part S is evacuated for decompression. Under the decompressed state, heating is performed until the granular objects P of thermoplastic resin in the air gap part S melt. After the granular objects P of thermoplastic resin melt, the atmosphere is led in between a molten object of the granular objects P and the sealing casing 1.</p> |
