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。
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