SELF-SUPPORTING BOX FOR THERMALLY INSULATING A FLUID STORAGE TANK AND METHOD FOR PRODUCING SUCH A BOX

摘要

The invention concerns self-supporting insulating box intended for thermally insulating a fluid storage tank comprising: - a bottom panel and a cover panel; - a plurality of supporting webs (14), interposed between the bottom panel and the cover panel; said supporting webs (14) having a composite structure comprising a central core (17) extending in the direction of thickness and two outer skins (18) sandwiching said central core (17), said central core (17) having lower thermal conductivity than that of the outer skins (18). The outer skins (18) comprise a fibre-reinforced thermoplastic polymer matrix, the central core (17) comprises a thermoplastic polymer matrix; and the outer skins (18) and the central core (17) are linked by melting the thermoplastic matrices of the outer skins (18) and of the central core (17).