stair construction with railing with high resistance to deformation even under high load galvanized steel floor grate and railing.

blocks building concrete construction cost covered deck deformation design detail downstairs embankment even floor footbridge front gabion galvanized garden grate gray grid high horizontal industrial load lookout mesh metal palisade parking path perforated pole railing railings ramp relief resistance river shore square stair staircase stairway steel steps sunny terrace transparent tree trunk wall welled winter zinc