PURPOSE:To improve safety of a work, by a method wherein an annular groove is formed in the peripheral surface of a male joint, a rotating pin, engaged with the male joint and preventing slip of the male joint, is located to a female joint. CONSTITUTION:A male joint 1 is removably mounted to a square columnar joint mounting part 2a at the upper end of a screw 2. A female joint 4 is located on the auger machine 5 side, and an annular groove 3 is provided in the peripheral part of the male joint 1. A pair of rotating pins 6 and 6' on both sides respectively have a clew piece 6a at the forward end of the pin which enters the annular groove 3 when the female joint 4 is engaged with the male joint 1, and this prevents slipping-out of the male joint 1. this eliminates a work to drive a straight pin at an elevated place, resulting in improvement of working efficiency and ensurance of safety of a worker.
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