Expansion plate for reserved expansion gaps

The utility model discloses an expansion plate for reserved expansion gaps. The expansion plate comprises a plate body. The cross section of the plate body is in a trapezoid shape. The length of the upper bottom of the trapezoid is 5-12 millimeters, and the length of the lower bottom of the trapezoid is 8-20 millimeters. The height of the plate body is 150-400 millimeters. Through adoption of the expansion plate for reserved the expansion gaps, in the operating process of reserving the expansion gaps in refractory material castable, the lower bottom of the expansion plate is arranged close to a refractory material working layer, and the upper bottom of the expansion plate is arranged far from the refractory material working layer. The positions of the lower bottom and the upper bottom of the expansion plate are matched with the temperature gradient of refractory materials in working. Therefore, the expansion plate for reserved the expansion gaps can effectively achieve uniformity clearances of the expansion g