CARGO TANK USING STRAIGHT CORRUGATION MEMBRANE CONNECTION MEMBER FOR EXTREMELY LOW TEMPERATURE SUBSTANCE CARRIER

摘要

The present invention relates to a cargo tank for an extremely low temperature material carrier, which comprises: a hull shell which forms the exterior of a cargo tank; a membrane first protective wall which is in contact with an extremely low temperature material inside the cargo tank; a first insulating wall which is installed in the external side of the first protective wall; a membrane second protective wall which is installed in the external side of the first insulating wall; and a second insulating wall which is placed in the external side of the second protective wall in order to be fixated to the hull shell. At least part of the second protective wall is formed of a metal material. The first insulating wall, the second protective wall, and the second insulating wall are combined by a combining unit which penetrates at least part of the first protective wall, the second protective wall, and at least part of the second insulating wall in order. According to the present invention, a cargo hold structure is further combined by a spring and a bolt fastening device in order to improve the coherence of the cargo hold structure to the hull shell and to effectively absorb the loads which asymmetrically applies to a horizontal wall corner unit and an edge, thereby realizing a cargo hold with a stable structure.