To close a powder resin called a bead or fused resin into a space enclosed by a recessed part so as to prevent generation of the bead by arranging the recessed part along a circumferential direction in an inner surface in the vicinity of a butt joint part of tip end parts of synthetic resin tubular members when the synthetic resin tubular members are inserted from two receiving ports.
Two receiving parts 11 formed with their back surfaces facing each other are disposed on a synthetic resin joint 1, and a recessed part 12 is arranged on a center of an inner surface along a circumferential direction. After tubular members 2 are inserted into the receiving members 11 of the joint 1, the joint 1 is rotated. While the joint 1 is rotated, pressure is applied on the tubular members 2 for preventing the tubular members 2 from slipping off from the joint 1. After rotation of the joint 1 is stopped, pressure is set to zero, this state is held, and the tubular members 2 are joined through the joint 1. In the inner circumferential surface of a joining part of the tubular members 2, a bead is not generated, and thereby, a pipe passage having a smooth inner surface is formed.
OGUCHI TAKASHI
HARADA KOJI
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