Before constructing , should carry out the derusting and rust - proofing treatment on the steel construction surface , the ones that had already antirusted should remove surface dust or other incidentals 施工前須對鋼結(jié)構(gòu)表面作除銹、防銹處理,已作防銹處理的應(yīng)清除表面塵土或其它雜物。