STEEL PIPE JOINT STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a steel pipe joint structure capable of effectively curbing stress concentration at a joint end section with a simple and low-cost structure without using a special joint structure.SOLUTION: A steel pipe joint section T is constructed by inserting an upper edge 1a of an inner pipe 1 into a lower edge 2a of an outer pipe 2 with an overlap having a predetermined length. A high strength edge grout material 3A which has strength barely enough to withstand intensity of stress is cast into stress concentration sections T1 and T2 at both edge sections of the steel pipe joint section T in a pipe axial direction. The edge grout material 3A has after hardening strength not less than the same of a central grout material 3B which is cast into a stress non-concentration section T3 between the stress concentration sections T1 and T2 where the edge grout material 3A is cast.