FASTENING STRUCTURE AND FASTENING METHOD OF PIPE AND FLANGE MEMBER

PROBLEM TO BE SOLVED: To provide a fastening structure and a fastening method of a pipe and a flange member which secures sealing performance, moreover, does not cause distortion or the like, can minimize a space necessary when performing an operation and also can reduce a cost.SOLUTION: A fastening structure of a pipe 10 and a flange member 20 is a structure for fastening the flange member 20 on a top end part 12 of the pipe 10. The flange member 20 has an opening part 22 communicated with a passage 11 of the pipe 10, and an annular first holding part 24 and an annular second holding part 25 protrusively formed toward the inner side from a peripheral part 23 of the opening part 22. The top end part 12 of the pipe 10 is formed between the first holding part 24 and the second holding part 25 while the diameter is enlarged to the outer side, and by being held between the first holding part 24 and the second holding part 25, the top end part 12 of the pipe 10 is fastened to the peripheral part 23 of the opening part 22 of the flange member 20.SELECTED DRAWING: Figure 1 【課題】シール性を確保した上で、歪み等が生じず、作業を行う際に必要なスペースを小さくでき、コストも削減できるパイプとフランジ部材の締結構造及び締結方法を提供する。【解決手段】パイプ１０の先端部１２にフランジ部材２０を締結する構造であって、フランジ部材２０には、パイプ１０の通路１１と連通する開口部２２と、開口部２２の周縁部２３から内側に向けて突出形成された環状の第１挟持部２４及び第２挟持部２５と、を有しており、パイプ１０の先端部１２が、外側に拡径された状態で第１挟持部２４と第２挟持部２５の間に形成されると共に、第１挟持部２４と第２挟持部２５で挟持されることで、パイプ１０の先端部１２が、フランジ部材２０の開口部２２の周縁部２３に固定されているパイプ１０とフランジ部材２０の締結構造とした。【選択図】図１