Heat insulation structure for corner parts of liquefied natural gas storage tank

A heat insulation structure for corner parts of an LNG storage tank, the LNG storage tank including a secondary insulation wall comprising multiple secondary insulation panels arranged on an inner wall of a hull, a secondary sealing wall disposed on the secondary insulation wall, a primary insulation wall comprising multiple primary insulation panels arranged on the secondary sealing wall, and a primary sealing wall disposed on the primary insulation wall, the heat insulation structure comprising:

• a corner assembly finishing an edge of the primary sealing wall at a corner part of the storage tank to complete sealing of the storage tank,
• wherein the corner assembly comprises an endcap sheet finishing each of four corners of the primary sealing wall provided to each surface of the storage tank to seal the four corners,
• wherein the endcap sheet comprises an endcap corrugation having an endcap shape and finishing a corrugation formed on the primary sealing wall;
• and an elongated corrugation extending in a direction perpendicular to a direction in which the endcap corrugation extends,
• wherein the elongated corrugation extends while maintaining a constant height on the endcap sheet so as to have an open structure at opposite ends of the endcap sheet in a width direction thereof, and
• wherein the endcap sheet is provided in plural to be continuously arranged in longitudinal and transverse directions of the storage tank such that the elongated corrugations formed on the endcap sheets are continuously connected to each other and extend in the longitudinal and transverse directions of the storage tank.