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A liquefied natural gas container including a loadbearing structure and an impermeable and thermally insulated tank designed to contain liquefied natural gas. Each tank wall having in succession, in a direction of a thickness, proceeding from an inside of the tank to an outside, a primary impermeabl

A liquefied natural gas container including a loadbearing structure and an impermeable and thermally insulated tank designed to contain liquefied natural gas. Each tank wall having in succession, in a direction of a thickness, proceeding from an inside of the tank to an outside, a primary impermeable barrier, a primary thermally insulating barrier, a secondary impermeable barrier, and a secondary thermally insulating barrier. The secondary impermeable barrier of a vertical wall includes a first impermeable sheet at the top of the wall and a connecting device which impermeably connects the first impermeable sheet to the loadbearing structure. The connecting device includes a first metal plate parallel to the first impermeable sheet, and a second impermeable sheet which is on the one hand bonded to the first impermeable sheet, and on the other hand connected to the first metal plate.

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1. A liquefied natural gas container comprising; a loadbearing structure (11, 111) and an impermeable and thermally insulated tank designed to contain liquefied natural gas, said tank comprising a plurality of tank walls fixed to said loadbearing structure,each tank wall having in succession, in a d

1. A liquefied natural gas container comprising; a loadbearing structure (11, 111) and an impermeable and thermally insulated tank designed to contain liquefied natural gas, said tank comprising a plurality of tank walls fixed to said loadbearing structure,each tank wall having in succession, in a direction of thickness along the longitudinal direction of the tank wall, proceeding from an inside of said tank to an outside, a primary impermeable barrier, a primary thermally insulating barrier, a secondary impermeable barrier and a secondary thermally insulating barrier,said tank walls comprising at least one vertical wall, the secondary impermeable barrier located on said vertical wall comprising a first impermeable sheet (16, 116) at the top of said vertical wall and a connecting device which impermeably connects said first impermeable sheet (16, 116) to said loadbearing structure (11, 111),wherein said connecting device comprises a first metal plate (22, 122) parallel to said first impermeable sheet (16, 116) and a second impermeable sheet (17, 117),wherein the second impermeable sheet (17, 117) comprises a first portion which is bonded to said first impermeable sheet (16, 116) and a second portion which is connected to said first metal plate (22, 122), the first portion and the second portion of the second impermeable sheet (17, 117) being parallel. 2. The liquefied natural gas container according to claim 1, wherein said second impermeable sheet (17, 117) is flexible, and has an unbonded zone between the first impermeable sheet (16, 116) and the first metal plate (22, 122). 3. The liquefied natural gas container according to claim 1, in which a third impermeable sheet (23, 123) is bonded to said first metal plate (22, 122), and said second impermeable sheet (17, 117) is bonded to said third impermeable sheet (23, 123). 4. The liquefied natural gas container according to claim 1, wherein said first metal plate (22, 122) is welded to a metal component (21, 121) connected to the loadbearing structure (11, 111). 5. The liquefied natural gas container according to claim 4, wherein said metal component (21, 121) has a vertical part (29, 129) and a horizontal part (30, 130), the first metal plate (22, 122) is welded to the vertical part (29, 129), andthe horizontal part (30, 130) is connected to the loadbearing structure (11, 111). 6. The liquefied natural gas container according to claim 1, wherein said first impermeable sheet (16, 116) is bonded to a layer of insulating material (15) or to a plate of plywood (132) forming part of the secondary thermally insulating barrier. 7. The liquefied natural gas container according to claim 1, wherein said loadbearing structure (11, 111) comprises vertical concrete wall sections configured to be installed on land. 8. The liquefied natural gas container according to claim 1, wherein said loadbearing structure (11, 111) is a double hull of a floating vessel. 9. The liquefied natural gas container according to claim 2, wherein a third impermeable sheet (23, 123) is bonded to said first metal plate (22, 122), said second impermeable sheet (17, 117) being bonded to said third impermeable sheet (23, 123). 10. The liquefied natural gas container according to claim 4, wherein the loadbearing structure (11, 111) includes: a horizontal section (13),a vertical part (14) extending downwardly from the horizontal section (13), anda horizontal part (28) extending toward the metal component (21, 121). 11. The liquefied natural gas container according to claim 10, wherein the horizontal part (30) of the metal component (21, 121) includes: an upper horizontal part (30) and a lower horizontal part (30) that extend from each end of the vertical part (29) in a direction away from the first metal plate (22), andthe loadbearing structure (11,111) is connected to a lower side of the upper horizontal part (30), andwherein the gas container further comprises:an L-shaped fixing bracket (20) arranged between a lower side of the horizontal part (28) of the loadbearing structure (11, 111) and an upper side of the lower horizontal part (30) of the metal component (21, 121). 12. The liquefied natural gas container according to claim 2, wherein said first impermeable sheet (16, 116) is bonded to a layer of insulating material (15) or to a plate of plywood (132) forming part of the secondary thermally insulating barrier. 13. The liquefied natural gas container according to claim 2, wherein the second impermeable sheet (17) is bonded to two sections of the first metal plate (22, 122) that join each other at an angle of approximately 90°, and the second impermeable sheet (17) is fixed in the angle by an angle bracket (31) bolted to the two sections of the first metal plate (22, 122). 14. A liquefied natural gas container comprising; a loadbearing structure (11, 111) and an impermeable and thermally insulated tank designed to contain liquefied natural gas, said tank comprising a plurality of tank walls fixed to said loadbearing structure (11, 111),each tank wall having in succession, in a direction of thickness along the longitudinal direction of the tank wall, proceeding from an inside of said tank to an outside, a primary impermeable barrier, a primary thermally insulating barrier, a secondary impermeable barrier and a secondary thermally insulating barrier,said tank walls comprising at least one vertical wall, the secondary impermeable barrier located on said vertical wall comprising a first impermeable sheet (16, 116) at the top of said vertical wall and a connecting device which impermeably connects said first impermeable (16, 116) sheet to said loadbearing structure (11, 111),wherein said connecting device comprises a first metal plate (22, 122) parallel to said first impermeable sheet (16, 116), and a second impermeable sheet (17, 117) which is bonded to said first impermeable sheet (16, 116) and connected to the first metal plate (22, 122),wherein the container further comprises:a metal component (21, 121) connected to the loadbearing structure (11,111), and having a vertical part (29, 129) and a horizontal part (30, 130),wherein the first metal plate (22,122) is welded to the vertical part (29,129), andthe horizontal part (30, 130) is connected to the loadbearing structure (11, 111). 15. The liquefied natural gas container according to claim 14, wherein said second impermeable sheet is flexible, and has an unbonded zone between the first impermeable sheet (16, 116) and the first metal plate (22, 122). 16. The liquefied natural gas container according to claim 14, in which a third impermeable sheet (23, 123) is bonded to said first metal plate (22, 122), and said second impermeable sheet (17, 117) is bonded to said third impermeable sheet (23, 123). 17. The liquefied natural gas container according to claim 14, wherein the horizontal part (30) includes an upper horizontal part (30) and a lower horizontal part (30, 130) that extend from each end of the vertical part (29) in a direction away from the first metal plate (22). 18. A liquefied natural gas container comprising; a loadbearing structure (11, 111) and an impermeable and thermally insulated tank designed to contain liquefied natural gas, said tank comprising a plurality of tank walls fixed to said loadbearing structure (11, 111),each tank wall having in succession, in a direction of thickness along the longitudinal direction of the tank wall, proceeding from an inside of said tank to an outside, a primary impermeable barrier, a primary thermally insulating barrier, a secondary impermeable barrier and a secondary thermally insulating barrier,said tank walls comprising at least one vertical wall, the secondary impermeable barrier located on said vertical wall comprising a first impermeable sheet (16, 116) at the top of said vertical wall and a connecting device which impermeably connects said first impermeable sheet (16, 116) to said loadbearing structure (11, 111),wherein said connecting device comprises a first metal plate (22, 122) having an upper portion extending parallel to said first impermeable sheet (16, 116), and a lower portion extending perpendicular to said first impermeable sheet (16, 116). 19. The liquefied natural gas container according to claim 18, wherein the secondary thermally insulating barrier comprises a prefabricated panel having a horizontal groove (25), and the lower portion of the first metal plate (22, 122) extends horizontally into the horizontal groove (25). 20. The liquefied natural gas container according to claim 18, wherein the container further comprises: a metal component (21, 121) connected to the loadbearing structure (11, 111), and having a vertical part (29, 129) and a horizontal part (30, 130),wherein the first metal plate (22, 122) is welded to the vertical part (29,129), andthe horizontal part (30, 130) is connected to the loadbearing structure (11, 111).