Liquefied gas storage facility comprising a polygonal load-bearing structure

A liquefied gas storage facility (1) comprising:

• a load-bearing structure (10) having an internal space delimited by a bottom load-bearing wall (11) and a vertical load-bearing wall (12), a contour of said bottom load-bearing wall (11) having the shape of an N-sided regular polygon, N being an integer greater than or equal to 4,
• said vertical load-bearing wall (12) being made up of N vertical load-bearing panels (14) and forming a polygonal cylindrical surface having said regular polygon as its directrix, where each of the N sides of the polygon corresponds to an intersection between the bottom load-bearing wall (11) and one of said vertical load-bearing panels (14);
• and
• a sealed tank (20) installed in the internal space of the load-bearing structure (10), the sealed tank (20) comprising a bottom wall (21) placed on the bottom load-bearing wall (11) and a vertical wall (22) placed on the vertical load-bearing wall (12),
• said vertical wall (22) being made up of N vertical panels (24), each vertical panel of the vertical wall (22) being fixed to one of the N vertical load-bearing panels (14),
• said bottom wall (21) comprising a plurality of angular sectors that are the image of one another through rotation by a predetermined angle about a vertical axis (Z), the predetermined angle being equal to k.360°/N, where k is a positive integer less than or equal to half of N, each angular sector (25) of the bottom wall (21) being connected to at least k of the N vertical panels (24) of the vertical wall (22),
• the sealed tank (20) comprising a corrugated sealing membrane (70, 170) intended to be in contact with a liquefied gas,
• wherein the corrugated sealing membrane (70, 170) of each angular sector (25) of the bottom wall (21) has first corrugations (72) oriented along a sector axis (X), the sector axis (X) being perpendicular to a first vertical panel connected to said angular sector (25), the first corrugations (72) being spaced one from the next by a regular corrugation pitch,
• wherein the corrugated sealing membrane (70, 170) of each angular sector (25) of the bottom wall (21) comprises a plurality of metal plates (71) welded together in a fluid-tight manner, the metal plates (71) being arranged to form ring portions (75) juxtaposed successively along the sector axis (X), each ring portion (75) consisting of a set of complete metal plates, and wherein the total number of first corrugations (72) per ring portion (75) that are present on the ring portions (75) increases in the direction of the first vertical panel, said total number per ring portion (75) being increased only every M successive ring portion (75) where M is a natural integer greater than or equal to 2.