Before installing the steel beams, workers assembled the shear tubes at the building's core, along with the 50-ton granite columns that supported the base. Since the steelwork began above the sky lobby on top of the base, workers climbed through the shear tubes to complete the sky lobby before installed the steel crane.
Before installing the steel beams, workers assembled the shear tubes at the building's core and the 50-ton granite columns that supported the base. Since the steelwork began above the sky lobby on top of the base, workers climbed through the shear tubes to complete the sky lobby before placing the steel crane.