当既有建筑物采用结构加固方案仍无法满足抗爆要求时，采用在建筑物外增设独立的钢筋混凝土或钢结构的外壳方法来进行抗爆保护。

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.