| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide both earthquake resistance and integral reinforcement in a joint part of a pipeline having many bending parts laid in the underground. SOLUTION: In this separation preventing pipe joint, a step difference 11 continued to the deepest part inside a joint from a fitting position of a lock ring 4 in an internal peripheral surface of a socket 1 is hollowly provided, a flexible positioning spacer 5 is internally fitted, in an inner circumferential surface side of this positioning spacer 5, a fitting groove 51 internally fitting a spigot protrusion 21 peripherally provided in the vicinity of an end part 22 of a spigot 2 is engraved. The positioning spacer 5, utilizing flexibility, is fitted to the fitting groove 51, and even by applying a pressure of water in a pipe at ordinary time, mutually connecting relation is maintained sufficiently opposite to the water pressure. Even against non-averaged force acting in a pipe of different shape, flexibility of the positioning spacer acts to be adjusted by performing suitable deformation so as to obtain uniform external force. When large-scaled movement of the ground is generated, fitting is unlocked, the lock ring 4 and the spigot protrusion 21 butt on each other, any more separation is completely impeded.</p> |
