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The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...
A staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades, and additional parts. [4] In buildings, stairs is a term applied to a complete flight of steps between two floors. A stair flight is a run of stairs or steps
Experiments done by the Obayashi Corporation, with concrete blocks 0.8 metres (2 ft 7 in) square by 1.6 metres (5 ft 3 in) long and weighing 2.5 tonnes (5,500 lb), showed how 18 men could drag the block over a 1-in-4 incline ramp, at a rate of 18 metres per minute (1 ft/s).
In 2005, a prototype of the first post-tensioned spiral stone staircase was made, called "Escalier Ridolfi". It was designed by Claudio D'Amato and Giuseppe Fallacara. [41] In 2006, the full-scale Escalier Ridolfi staircase was presented at the Venice Biennale of Architecture, constructed by Ateliers Romeo stonemasons [42]
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Staircase to the second floor and to the basement. Directly across the hallway from the top of the staircase, on the northern side of the house, is the ballroom. Against the wall to the right of the door to the ballroom was an eight-legged George III mahogany sofa, circa 1770. Either side of the sofa was a pair of carved polychrome and giltwood ...
A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]
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