Sluice gate

A sluice gate that is provided passing over a sluice for water flow or ships, said sluice gate comprising:

• a torsion structure that comprises a closed cross-section formed by a thin wall provided in a direction crossing over the sluice;
• a rail provided in the direction crossing over the sluice;
• and
• a plurality of axle supports provided along a bottom of the torsion structure, that work as restriction points and move along the rail;
• wherein
• a cross-sectional form of a head region of the rail is a convex circular arc of 180 degrees or greater,
• each axle support comprises a roller that moves along the rail in the direction crossing over the sluice by rotating along the head region of the rail,
• a cross-sectional form of a tread surface of each roller is a concave circular arc whose radius corresponds to the radius of the convex circular arc of the head region of the rail,
• the closed cross-section rotates about the head region of the rail relative to closed cross-sections at an adjacent respective restriction point as a result of the plurality of closed cross-sections being in a twisting deformation state, and
• a torsion moment composed of an applied load and a reaction force at the restriction point is transmitted to a terminal of the structure due to a torsion rigidity.