| 摘要 |
<p>A lock gate door (1) includes a pair of door bodies (2, 3); a pair of spherical bearings (6) for a lock gate door for rotatably supporting lower corner portions (4) of the door bodies (2, 3), respectively; and a pair of supporting portions (7) for rotatably supporting upper corner portions (5) of the door bodies (2, 3), respectively. The spherical bearing (6) includes a convex curved body (22) having a spherical surface (21) and a concave curved seat (24) having a toroidal curved surface (23) which slidably contacts the convex curved body (22), and is disposed on a downstream (16) side of a waterway (9) with respect to the supporting portion (7) in such a manner as to incline a rotational axis (C).
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