iron railing on the river

arrester balcony beam bolts bonus calculation connection construction corrosion design detail dowel elements engineering fall fireproof flange floors footbridge galvanization gangway grate grating gray grey handle handrail inox ipe iron jumped line material meccanica metal oxidation paint painting park passage planning pontoon post profile project railing road rust safety seismic spots steel stitches structural structure super surface tubular urban walkway welded wire