Needed according to the degree of damage to the horseshoe part of the judgment with what kind of material to repair, damage shallow (depth less than 2cm), using epoxy resin mortar for repair, if the damage is deeper (depth of 2cm and 5cm), using polymer mortar for repair, the depth of damage is greater than 5cm or a larger area, you can use a small stone concrete for repair. When repairing, pay attention to chiseling the loose concrete on the surface, descaling the rusted reinforcement, applying the interfacial agent, and then applying the repair material. Basically, this is it.