Sealed and thermally insulating tank

A sealed and thermally-insulating fluid storage tank wherein a tank wall comprises from the exterior to the interior of the tank a secondary thermally-insulating barrier and a secondary sealed membrane, the secondary sealed membrane being anchored to the secondary thermally-insulating barrier, a primary thermally-insulating barrier resting against the secondary sealed membrane and a primary sealed membrane resting against the primary thermally-insulating barrier and being intended to be in contact with a fluid contained in the tank, wherein said secondary thermally-insulating barrier comprises a first plane portion and a second plane portion oriented at an angle to the first plane portion, a junction between the first secondary thermally-insulating barrier plane portion and the second secondary thermally-insulating barrier plane portion forming an edge, the first plane portion forming a first anchor zone for the secondary sealed membrane, the first anchor zone being at a distance from the edge, the second plane portion forming a second anchor zone for the secondary sealed membrane, the second anchor zone being at a distance from the edge, the secondary thermally-insulating barrier comprising a corner portion between the first anchor zone and the second anchor zone and comprising the edge, the secondary sealed membrane comprising a corner piece, said corner piece being sealed and comprising a first portion anchored to the first anchor zone and a second portion anchored to the second anchor zone, the corner piece further comprising a central portion between the first portion and the second portion, said central portion being free to deform relative to the secondary thermally-insulating barrier in line with the edge, the tank comprising a duct extending in a longitudinal direction parallel to the edge, said duct being delimited by the central portion of the secondary sealed membrane and the corner portion of the secondary thermally-insulating barrier, the corner portion of the secondary thermally-insulating barrier forming a bottom of the duct, the tank further comprising a pressure-drop obstacle arranged in the duct and extending between the bottom of the duct and the central portion of the secondary sealed membrane, in which said pressure-drop obstacle includes an anchor strip and a flexible portion,

• the anchor strip extending in a direction intersecting the longitudinal direction of the duct, the flexible portion including a plurality of flexible elements projecting from the anchor strip in the direction of the secondary sealed membrane, and
• a free end of the flexible elements opposite the anchor strip being in contact with the secondary sealed membrane so as to create a pressure drop for a flow circulating in the duct, said flexible elements being able to flex elastically in contact with the secondary sealed membrane.