Patent ID: 8444187

Claim:
A separation prevention method for a pipe joint, that connects a first pipe having a receiving opening and a second pipe having an inserting opening, comprising: fitting an engaging tool over the second pipe, said engaging tool comprising a plurality of disengagement prevention members disposed at a plurality of locations in a circumferential direction, such that claws formed on the disengagement prevention member face an outer peripheral surface of the inserting opening, and a claw of at least one of the disengagement prevention members and a claw of an adjacent disengagement prevention member, which is adjacent in the circumferential direction of the pipe, are arranged so as to overlap each other when viewed in an axial direction of the pipe in a state where the claws are engaged with the outer peripheral surface of the inserting opening; inserting the inserting opening of the second pipe into the receiving opening of the first pipe; engaging the engaging tool with the first pipe; and pressing the disengagement prevention members radially inward of the pipe joint, wherein the disengagement prevention members disposed at the plurality of locations in the circumferential direction of the pipe are accommodated in an annular groove which opens toward the inserting opening in the inner peripheral surface of the engaging tool or the receiving opening itself.