Patent ID: 7540395

Claim:
A sealed wall structure, intended in particular for the internal lining of a sealed and thermally insulating tank (C) integrated into a supporting structure ( 13 ), comprising: at least one sealed plate ( 10 ) of which an internal face is intended to be in contact with a fluid, said plate ( 10 ) being corrugated with at least a first series of corrugations ( 5 ) and a second series of corrugations ( 6 ) the respective directions (L, T) of which are transverse to each other, said corrugations protruding on a side of said internal face, each corrugation ( 5 , 6 ) presents a crest ( 5 a , 6 a ), lateral faces ( 5 b , 6 b ) and troughs ( 5 c , 6 c ), and said internal face comprises at least one reinforcing ridge ( 11 , 111 , 211 ) made on at least one corrugation of one of the aforementioned series of corrugations in its portion lying between two successive intersections ( 8 ) with corrugations of the other series of corrugations, each ridge ( 11 , 111 , 211 ) being generally convex with its convexity protruding on the side of an external face that is the opposite face of the internal face, said ridge ( 211 ) being made locally on at least one lateral face ( 5 b , 6 b ) at some distance from the crest ( 5 a , 6 a ) and from the troughs of the corrugation ( 5 , 6 ) that supports it.