JOINT STRUCTURE OF COPPER PIPE FOR WATER/HOT-WATER SUPPLY PIPING

PROBLEM TO BE SOLVED: To provide a joint structure of a copper pipe for water/hot-water supply piping which joint structure effectively suppresses occurrence of erosion and corrosion at a joint of the copper pipe for water/hot-water supply piping.SOLUTION: In the joint structure of the copper pipe for water/hot-water supply piping, an end of a joint 3 is widened in pipe diameter, and a copper pipe 1 is attached to the end of the joint 3 widened in pipe diameter such that the outer wall surface of the copper pipe 1 overlaps the inner wall surface of the joint 3. Water or hot water is supplied to flow toward a pipe end 4 of the attached copper pipe 1. The copper pipe 1 attached to the end of the joint 3 is cut out slantly from an inner spot L (mm) from the pipe end 4 to the pipe end 4 in a direction from the inner wall surface toward the outer wall surface of the copper pipe 1. When a distance from the inner wall surface of the joint 3 to the inner wall surface of the slantly cut pipe end 4 of the copper pipe 1 is Δd' (mm) and a distance from the inner wall surface of the joint 3 to the inner wall surface of the copper pipe 1 is Δd (mm), inequalities L≥Δd and Δd'/Δd≤0.5 are satisfied.