| 摘要 |
PROBLEM TO BE SOLVED: To easily keep a joint in an assembled condition without soldering it at a site. SOLUTION: In such a state that the lower end of an upper pile 1 abuts on the upper end of a lower pile 2, an outer tapered face 9 having a smaller diameter as going to the lower side is formed on the outer periphery of a middle ring 10 which can be freely externally fitted between the lower end outer periphery of the upper pile 1 and the upper end outer periphery of the lower pile 2 to form a split middle ring 10A split into a plurality of parts in the peripheral direction. A groove 5 formed along the peripheral direction of a pile and an engaging protruded portion 8 for engaging with the groove 5 are separately formed in the inner periphery of the middle ring 10 corresponding to the lower end outer periphery of the upper pile 1 and on the inner periphery of the middle ring 10 corresponding to the upper end outer periphery of the lower pile 2, respectively. An outer ring 12 is provided which has an inner tapered face 11 formed on the inner periphery so as to be externally fitted to the outer tapered face 9 of the middle ring 10, and a come-off preventing means is provided for preventing the come-off of the outer ring 12 from the middle ring 10. COPYRIGHT: (C)2010,JPO&INPIT |
