To provide a pipe connecting structure capable of preventing reduction in airtightness in a pipe connecting part.
The connecting part 1 is formed as a structure for connecting first and second pipes 2 and 4, by connecting a first flange 8 formed in a tip part 2b of the first pipe 2 and a second flange 9 formed in a tip part 4b of the second pipe 4 by bolts 12 and 14 and nuts 16 and 18. Intermediate members 20 and 22 are filled between head parts 12b and 14b of the bolts 12 and 14 and the first flange 8 and between the nuts 16 and 18 and the second flange 9. A thermal expansion coefficient of the intermediate members 20 and 22 is set larger than a thermal expansion coefficient of the bolts 12 and 14 and the nuts 16 and 18. Thus, even when high temperature gas G1 flows in the first and second pipes 2 and 4, a clearance can be prevented from being generated between the bolts 12 and 14, the nuts 16 and 18 and the first and second flanges 8 and 9.
YAMASHITA TAIICHIRO
Shiro Terasaki
Masatoshi Shibata