Patent ID: 7168744
Filing Date: 2007-01-30
Classification: F16B,Y10S,Y10T

Abstract:
1. A fastening structure for use at a low temperature comprising: a first flange; a second flange superposed on said first flange; and a bolt fastening said first flange and said second flange with a nut; wherein said fastening structure is used at a temperature lower than an atmospheric temperature at which a fastening operation is performed, a relation of  is satisfied, where L an amount of heat shrinkage of said bolt is equal to or larger than a total amount of heat shrinkage of said first flange and said second flange, and wherein said second flange is a part of a container storing a cryogenic coolant inside, and said container is sealed by fastening said first flange to said second flange with said bolt, and an outer container defining a vacuum portion is provided outside said container.