The present invention is a reinforcing method for improving the seismic performance of a reinforced concrete school building, comprising: (a) performing a structural evaluation of the waist wall 10, which is a masonry wall; And (b) in the case of evaluating any one of the reinforcement targets according to the evaluation result of (a) above, each tube 23 with respect to the column 20 adjacent to the evaluated waist wall 10 corresponding to the evaluated grade. ) And a step of performing reinforcement using a non-constricted mortar, and the evaluation results of step (a) are classified into reinforcement targets and non-reinforcement targets, and the reinforcement targets are first, second, and third grades. If the reinforcement target is the 1st class, anchor each leg 23 on the 3 sides of the pillar 20 of the school building, and put a non-shrinking mortar into each tube, and if the reinforcement target is the 2nd class, the pillar of the school building ( Anchor tube 23 is anchored on the 2nd side of 20), and a non-shrinking mortar is put into each tube, and if the reinforcement target is class 3, anchor each tube 23 on one side of the pillar 20 of the school building and unshrinkage mortar It provides a method of reinforcing, which is injected into each tube.
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