... ) Steel Structure Storage Bunker (Single,Double,Trio) For Accommodation(Coal,Concrete) Hangzhou Zhongxin Steel Structure Make Co., Ltd( ... professional contractor and Class A professional designer of steel structures. ZXSS has also obtained certifications of ISO9001:2000, ... Steel Building,Space Frames, Portable Cabins, Tubular Steel Structures,basic building elements(built-up welded H-section , hot ...