Leaf for a mitre gate and mitre gate including such a leaf

1. A leaf for a mitre gate, the leaf comprising:

a skin plate for withstanding a pressure exerted by a liquid; and

at least two uprights respectively located on either side of the skin plate, the uprights being secured to the skin plate, the skin plate having an overall shape of a cylinder portion, a longitudinal axis of the cylinder being essentially parallel to the uprights, each upright extending overall according to a generatrix of the cylinder, each upright including at least one bearing element, arranged to project relative to the skin plate, and each bearing element including a bearing surface, for supporting the bearing element against a lock wall or against another leaf of the mitre gate, wherein the bearing surface of each bearing element intersects with a plane that is tangential to an upstream surface of the skin plate, at the side of the skin plate corresponding to said bearing element.

2. The leaf according to claim 1 , wherein the bearing surface of at least one bearing element is perpendicular to a middle plane that is parallel to the plane tangential to the upstream surface of the skin plate and that extends a middle fiber of the skin plate, on the bearing element side.

3. The leaf according to claim 2 , wherein said bearing surface is centered on the middle plane.

4. The leaf according to claim 1 , wherein the bearing surface of at least one bearing element is planar.

5. The leaf according to claim 1 , wherein the bearing surface of at least one bearing element is in the shape of a cylinder portion whereof a longitudinal axis of the bearing element is parallel to the longitudinal axis of the cylinder that defines the shape of the skin plate.

6. The leaf according to claim 1 , wherein each bearing element is made up of a profile.

7. The leaf according to claim 1 , wherein the cylinder has an elliptical base.

8. The leaf according to claim 1 , wherein the cylinder has a circular base.

9. The leaf according to claim 1 , wherein the cylinder has a parabolic base.

10. The leaf according to claim 8 , wherein a first ratio that has:

as numerator, a curve radius of the cylinder, and

as denominator, a width of the skin plate, measured between the two uprights, is between 0.6 and 13.

11. The leaf according to claim 1 , comprising:

several thin, flat cores, each core having, in a plane transverse to the skin plate, a curve coinciding with the skin plate, each core widening toward the middle thereof and narrowing toward its ends, each core being secured to the skin plate.

12. The leaf according to claim 11 , wherein each core is pierced with at least one recess and wherein the leaf comprises at least one generally rectilinear stiffener extending through the recesses respectively belonging to several cores.

13. The leaf according to claim 12 , wherein at least one stiffener is tubular.

14. The leaf according to claim 12 , wherein the or each stiffener is fastened to several cores using welds made in a plane perpendicular to an axis of the cylinder.

15. The leaf according to claim 12 , wherein it also comprises a fastener for fastening a member for actuating the leaf, the fastener being connected to one end of a stiffener.

16. A mitre gate comprising two leaves, wherein each leaf is according to claim 8 and wherein a second ratio that has:

as numerator: a width of the mitre gate, measured between the two uprights that are the furthest apart, and

as denominator: a curve radius of the cylinder is between 0.6 and 1.8.