CONNECTION STRUCTURE OF PIPING

摘要

PROBLEM TO BE SOLVED: To provide the connection structure of a piping to easily and accurately connect a flare bolt and a flare machined part. SOLUTION: A connection structure of a piping comprises a flare bolt 2 connected to the tip part of one piping and provided at a tip outer peripheral part with a tapering-off slope 2a; a flare nut 4 inserted in the tip part of the other piping 3 and having a slope part 4a parallel in the slope 2a of the flare bolt 2; and a flare machined part 3a corresponding to the slope 2a of the flare bolt 2 and expanding the tip part of the other piping 3. An externally protruding protrusion part 2b is formed on the tip outer peripheral part of the slope 2a of the flare bolt 2 and fitted in the piping inner peripheral surface 3b of the flare machined part 3a of the other piping 3.