| 摘要 |
PROBLEM TO BE SOLVED: To provide the protection method and the protection construction of a joint part of a resin coating steel pipe which do not peel off the coating resin when a pipe drives in an underground as well as the spheroidal tool used for the same. SOLUTION: In the joint part protection method of the resin coating steel pipe which an anticorrosive layer and a protection layer are formed to the outer circumference of an original pipe (steel pipe) in two layers, the joint part protection structure of the resin coating steel pipe removes the protection layer 23a, 23b and the anticorrosive layer 22a, 22b of a prescribed length from the resin coating steel pipe 2a, 2b. About the joint part which is jointed by confronting the edge part of the resin coating steel pipe 2a, 2b each other, the protection layer 23a of the resin coating steel pipe 2a on the drive direction side is peeled off from end of the anticorrosive layer 22a with the prescribed length and an annular clearance 26 is formed between the protection layer 23a and the anticorrosive layer 22b by using the spheroidal tool 3. The anticorrosive layer 22a, the anticorrosive member 4, the protection member 5 to protect the outer circumference part of the protection layer 23b and the anticorrosive layer 22b constitutes this unit, while inserting one end in this clearance 26. COPYRIGHT: (C)2007,JPO&INPIT
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