... , 3) gurantee quality 4) ISO9001-2000 and CE Steel Workshop with CE1) the main steel frame ---- welding H steel . 2) ... -----time saving , lalor saving ,easyly installatioin. 3) insulation panel ----EPS, XPS,Rock wool , PU sandwich 4) surface treatment ------anti-rust paint with ... ). The beams and columns, beams and beams are connected with high intensity bolts.21). The envelop construction net is made ...