stair construction for car parks with high resistance to deformation even under heavy loads welded floor grate made of galvanized

blocks building car concrete construction cost covered deck deformation design detail even fence floor footbridge front gabion galvanized garden grate gray grid heavy high horizontal industrial infrastructure interlocked loads low made mesh metal mountain palisade parking parks paving perforated pole railing ramp relief resistance retaining snow square stair staircase stairway steel steps sunny tower transparent view wall welded welled winter zinc