assembled metal bridge base, bolted assembly.

armor assembled assembly background base bolt bolted bridge cast chain construction covered device dilapidated electrode equipment factory fastening fire flank floor flooring frontal gloves gray grid hardware installation intermittent iron job large largescale made marking metal normal nut nuts oblique old parts place pro production protection qualification rail rebar red reinforced restriction rolled rust seam sheet site sparks stage steel structures study tools welded welder welders welding work workpieces workshops