| 摘要 |
PROBLEM TO BE SOLVED: To correctly arrange a manhole joint and a clamp to the boring of a manhole at a low cost. SOLUTION: A positioning jig 30 positions a manhole joint 2 inserted in a boring 1a made on the way of a manhole 1 for a manhole 1. The positioning jig 30 is provided with an axial angle correction means 31 contacted on two parts separated in the axial direction of the manhole 1 on the outer peripheral face 1b, a circumferential angel correction means contacted on two parts separated in the circumferential direction of the manhole 1 on the outer peripheral face 1b of the manhole 1, a positioning projection 33 contacted on the end face 2c of the expansion part 2a of the manhole joint 2, and an expansion jig positioning means 34 positioning a clamp expansion jig 4. The clamp expansion jig 4 is straightened to the boring 1a, and the manhole joint 2 and clamp are arranged correctly.
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