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Elevators are necessary for disability access to floors serviced by escalators. Escalators typically rise at an angle of 30 or 35 degrees from the ground. [ 25 ] They move at 0.3–0.9 metres per second (1–3 ft/s), like moving walkways , and may traverse vertical distances in excess of 18 metres (60 ft).
Additional elevators connect the 80th floor to the six floors above it, as the six extra floors were built after the original 80 stories were approved. [31] [102] The elevators were mechanically operated until 2011, when they were replaced with automatic elevators during the $550 million renovation of the building. [103]
Many variations of geometrical stairs may be formed of circular, elliptical and irregular constructions. [4] Ascending a set of stairs to a higher floor is often referred to as going "upstairs", [5] the opposite being "downstairs". [6] The same words can also be used to mean the upper or lower floors of a building, respectively. [5] [6]
Yamasaki and the engineers decided to use a new system that included sky lobbies, which are floors where people can switch from a large-capacity express elevator, which goes only to the sky lobbies, to a local elevator that goes to each floor in a section. Thus, the local elevators can be stacked within the same elevator shaft. [78]
When the next level is different from the others, usually with higher ceiling and better decorations, then it is called principal (main floor) [12]. This is because before elevators the apartments in the floor that required less stairs to reach was the most expensive and usually also the most luxurious one.
If conquering the stairs is becoming a Herculean task, the idea of installing a stair lift may have crossed your mind. But maybe the cost of a stair lift appears too steep a climb for your budget.
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