| Earthquake proofing bearing supports of a bridge constructed in a cold region at should be those which are not affected by temperature change and able to work stably any temperature throughout the year．To meet this conditon a bearing support with the following structure is developed：a top concave shoe is placed in the upper part as usual and between the top concave shoe and a convex rotator which is attached to the bottom concave，a lens shaped turning board is installed，The turnig board whose surface has only controlled microscopic frictional resistance can move freely against horizontal forcesand touches the top and bottom concave shoes within the range of the curvature radius R of the convexrotator． |
