| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide both flexibility and gas-blast circuit breaking performance at a low temperature by inserting/executing a low temperature heat insulating convection preventive material in the joint part and the filling part by compressively deforming the low temperature heat insulating convection preventive material. SOLUTION: A low temperature heat insulating convection preventive material 4 composed of a lightweight organic foaming body is inserted/executed in the joint part and the filling part. Since the lightweight organic foaming body has both flexibility and convection preventive performance, the low temperature heat insulating convection preventive material 4 is compressively deformed to be inserted/executed in the joint part and the filling part. In that case, to cope with the expansion of a joint width by a temperature change in a heat insulating structure, the low temperature heat insulating convection preventive material 4 is executed by compressive deformation by anticipating an expansive displacement quantity of the joint width. Thus, the lightweight organic foaming body absorbing the expansive displacement quantity of the joint width and having gas-blast circuit breaking performance is used as the low temperature heat insulating convection preventive material 4 to release strain stress by a temperature change in the heat insulating structure as well as to simultaneously provide excellent heat insulating performance.</p> |
