| 摘要 |
<p>PROBLEM TO BE SOLVED: To reliably and easily block up a bored hole part by embedding a blocking-up piece having a through screw hole capable of being blocked up by a screw in the bored hole part of a pipe conduit, and fixing the blocking-up piece in a condition of blocking up a part between an outer periphery of this blocking-up piece and an inner periphery of the bored hole part. SOLUTION: A metallic blocking-up piece 21 which has a diameter slightly smaller than a bored hole diameter and has a through screw hole 22 in a central part, is embedded in a part of a pipe main body 5 in the bored hole part 7. When the bored hole part 7 is blocked up by using this blocking-up piece 21, first of all, the blockin-up piece 21 is held in a prescribed position, and a part between an outer periphery of the blocking-up piece 21 and an inner periphery of the bored hole part 7 is welded from the inside of a pipe. At this time, steam 13 generated from moisture in earth and sand by a temperature rise at welding time, is discharged in the pipe by passing through the through screw hole 22. After welding is completed, a backfilling material such as cement is filled in a space on the pipe outside more than the blocking-up piece 21 by using the through screw hole 22. Afterwards, the through screw hole 22 is blocked up by a screw such as a bolt, and is put in a completely blocked-up condition.</p> |
