| 摘要 |
PROBLEM TO BE SOLVED: To provide a separation preventive structure of a pipe dispensing with a concrete block, with excellent flexibility. SOLUTION: An annular body 6 of a separation preventive means 4 has an annular body part 6a fitted to the outer peripheral end part vicinity of a straight pipe 2, and having a claw member 8 locking on the outer peripheray of the straight pipe 2, and an annular projecting part 6b fitted to an outer peripheral end part of an elbow 1, and fixed to the elbow 1. The body part 6a and the projecting part 6b are arranged in a position different by 180 degrees in the circumferential direction of the body part 6a and the projecting part 6b, and are connected by two pins 11 extending in the radial direction of the body part 6a and the projecting part 6b.
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