scaffolding on a construction site, detail of the scaffolding structures made of galvanized steel joints and structures

construction site scaffold accident prevention scaffolding tubular steel trade pipeline architecture beams bonus build coat concrete sites design eco energy classes engineering facades factory galvanized geometric home house housing industry innocenti iron labyrinth plot metal nuts occupational safety pipe pipes protections recovery redevelop renovate symbol work progress parapet building facade frame job restoration stone guards structure detail structures made joints mounted workmanlike manner where dictated law