Steel structure movable doorsill double-leaf protective air-tight door

The utility model relates to a civil air defense door, in particular to a double-leaf protective airtight door with a steel structure and a movable doorsill. The device comprises an upper floor, a lower floor and a protective door, the protective door is fixedly mounted between the upper floor slab and the lower floor slab; the protective door is arranged to be a side-hung double-leaf door, a mounting cavity is formed in the lower floor slab, a lifting threshold is arranged in the mounting cavity and comprises a first threshold body and a second threshold body, the first threshold body is slidably connected with the second threshold body, and a driving device used for driving the lifting threshold is arranged between the upper floor slab and the lower floor slab. 本实用新型涉及人防门，更具体地说，它涉及一种钢结构活门槛双扇防护密闭门。包括上楼板、下楼板和防护门，防护门固定安装在上楼板和下楼板之间，防护门设置为平开式双扇门，所述下楼板开设有安装腔，安装腔内设置有升降门槛，升降门槛包括第一门槛和第二门槛，第一门槛与第二门槛滑动连接，上楼板和下楼板之间设置有用于驱动升降门槛的驱动装置。