Slabs are concreted complete with ducts and openings framed with metal aprons welded to slab reinforcement and intended to accommodate columns.

• 楼板用混凝土浇注成整体，其上留有用金属挡板围成的孔道和提升环，它们和楼板配筋焊接在一起，以备将柱子套入其中。