Skytree borrowed the pagoda's spine 心柱
The counterweight that steadies Tokyo Skytree is a stairwell. A reinforced-concrete cylinder carrying the emergency stairs runs up the core, structurally divorced from the outer steel tower; its upper length swings out of time with the tower and cancels about forty percent of response shear in a major quake. Skytree named it after the pagoda's central pillar — using a staircase as that weight was a world first.
TOKYO SKYTREE




















































































