當既有建筑物采用結構加固方案仍無法滿足抗爆要求時，采用在建筑物外增設獨立的鋼筋混凝土或鋼結構的外殼方法來進行抗爆保護。

When an existing building cannot meet the anti-explosion requirements by adopting structural reinforcement schemes, an independent reinforced concrete or steel structure outer shell method is adopted for anti-explosion protection.