... design. ISO9001&ASTM Prefab steel structure workshop/Industrial building /warehouse construction Qingdao Baoduo Steel Structure CO.,LTD.Main Grade: ... Garage,Hanger,Agricultral storage,Logistic centers,and all kinds of steel materials.,etc.Specifications:Main Steel: Q345B,Q235BColumn&Beam: ... -span ,Multi-span,single floor,two story or muti-storey3.basecement and steel foundation anchor bolts4.column ...