PURPOSE: To facilitate work by fusing a metallic door stop to a specified dimension, to peel it off a concrete gate column in order, and by grinding the peeled- off surface of the gate column, to fill up a gap between a renewed fitted door stop the column gate, with liquid-like adhesives.

CONSTITUTION: A ready-set metallic door stop is fused to a specified dimension, and is peeled off a concrete gate column 20. After that, the peeled-off surface of the gate column 20 is ground, and a renewed metallic door stop 10n is fitted on the gate column 20, and except the upper partial section of the door stop 10n, the side surface and bottom surface are sealed with joint sealing agent 50. After that, a gap 40 between the renewed metallic door stop 10n and the gate column 20 is filled up with liquid-like adhesives for injection through the upper partial section, and is sealed. As a result, the safety of work can be improved.