If a section of the main reinforcement has been separated from the column concrete, the concrete is damaged and the cross-sectional area is greatly reduced, the bearing capacity of this column will be greatly reduced, which is very dangerous. At this time, the column concrete and undamaged steel bars should be reset and repaired immediately with high-strength materials with early strength and rapid setting (such as epoxy concrete). If only the concrete skin falls off, the steel bar is still wrapped in the concrete, only one side is exposed, and it is well bonded with the concrete, which belongs to the concrete protective layer falling off. Repairing the falling place with fine stone concrete in time will not affect the stress and service life of the column.

As for the impact of steel bar damage on buildings, it depends on the form and severity of the damage. For example, the main reinforcement is bent at a small angle and can be carefully straightened; When the stirrup is deformed or displaced, it can be reshaped and bound again; Groove marks on the main reinforcement due to carving can be filled by electric welding (until the surface of the reinforcement protrudes). Be careful not to weld continuously when repairing, so as to avoid annealing of steel bars and reduce strength). If the steel bar is smashed, repeatedly bent or disconnected, it can be welded according to the specification requirements. Although the welding position and the number of joints are not necessarily so ideal, the impact on the building has been greatly reduced or extremely slight.

In either case, after the reinforcement processing is completed, the column should be repaired with fine stone concrete in time, which can not be ignored.