1. A door leaf (1, 101) for a double-leaf gate (100), comprising: a sheet of metal (2) designed to withstand the pressure (P) exerted by the liquid, and at least two posts (4, 6) located, respectively, on each side (24, 26) of the metal sheathing sheet (2); moreover, the posts (4, 6) are rigidly connected to the metal sheathing sheet (2); the metal sheathing sheet (2) is in the form of a part of a cylinder (C2); moreover, the longitudinal axis (Z2) of the cylinder (C2) is parallel to the struts (4, 6); each strut (4, 6) is elongated as a whole according to the generatrix (Z24, Z26) of the cylinder (C2); each post (4, 6) contains at least one support element (40, 60), located protruding relative to the metal sheathing sheet (2); moreover, each support element (40, 60) contains a support surface (42, 62) to ensure the abutment of the support element (40, 60) against the side wall of the lock chamber (5) or another door leaf (1, 101) of the double-leaf gate (100) ; moreover, the door leaf (1, 101), characterized in that the support surface (42, 62) of each support element (40, 60) is elongated in the continuation of the plane (P4, P6), which is located tangentially to the metal sheathing sheet (2), on level of the side (24, 26) of the metal sheet (2) corresponding to this support element (40, 60). 2. Door leaf (1, 101) according to claim 1, characterized in that the supporting surface (42, 62) of at least one support element (40, 60) is perpendicular to the median plane (P40), which is parallel to the plane (P4, P6 ), which is located tangentially to the metal sheathing sheet (2) and which is a continuation of the median core (P2) of the metal sheathing sheet (2), from the side of the mentioned support element (40, 60). 3. Door�
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