| 摘要 |
PROBLEM TO BE SOLVED: To provide a restraint joint for a propulsion pipe using a steel-concrete composite steel pipe which can be sufficiently immune to a load acting in a breakaway direction even if the load is large in a water passage or the like where impulsive inner pressure increase occurs.SOLUTION: A reduced diameter part 12 for stopper metal fitting abutment which protrudes in a ring shape is provided on an inner circumferential surface of a rear end of a collar part 11, and a cutoff packing 16 which slides in pressure-contact with the inner circumferential surface of the collar part 11 is supported not to be moved relatively in an outer circumference of an insertion part 13. In the insertion part, a plurality of through holes 20 for fitting a stopper metal fitting are provided at intervals in a circumferential direction while being turned in a radial direction, and a stopper metal fitting 25 is threaded into a screw hole on an inner circumferential surface of the through hole 20. While inserting the rear-side insertion part 13 into the collar part 11 of a front-side propulsion pipe 10a, the stopper metal fitting 25 is operated from the inside of the propulsion pipe, such that the distal end thereof is projected outside from an inner diameter of the reduced diameter part 12 in a rear end of the collar part 11. |
