| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for expanding internal diameter over the entire length of a pipe capable of performing internal diameter expansion work for a long, not-yet-cut pipe by a single run and also capable of correcting the expansion of internal diameter and the internal diameter dimensions only by moving a jig without moving the pipe.SOLUTION: The apparatus for expanding internal diameter over the entire length of a pipe comprises: a work part 100 for placing a pipe 101 for which pipe expansion is performed to correct the internal diameter dimensions through pipe expansion; an operation part 200 for performing back-and-forth reciprocating operation for the pipe on the work part to correct the internal diameter dimensions through pipe expansion; and a mounting part 300 for holding a front end portion of the pipe in the interface part between the work part and the operation part. The operation part comprises: a chain 223 being driven in a retreating direction relative to the pipe on the work part; a carrier 210 detachably linked to the chain and moving along the chain; and a supporting bar 211 of a predetermined length disposed at a front end of the carrier, passing through the inside of the pipe via the mounting part, and having a diameter expansion plug detachably coupled to the tip end thereof. |
