Toyota Stadium was developed by Kisho Kurokawa Architect & Associates and represents a compact space created using a set of slightly inclined, reinforced concrete septa which are heightened from the flat ground. The outside is characterized by four large steel and pointed pennons that offer an endearing feeling to the complex which also compliment the continuous waved profile of the upper tiers that rise towards the main tribunes.
The shape of the metallic roof is accentuated by the subtle waves above the tiers which resemble the traditional shape of Japanese roofs. The roof contains an accordion-like moving element that is operated by a system of air-pillows that enables the stadium to completely close itself.
The inside of the stadium is defined by the elegant fixed roof made of numerous metallic elements which are supported by tie-beams on the four large pennons. The pennons emerge through holes in the roof and gradually thin until reaching a height of 93 meters.
The mobile roof glides on rails put on the supporting beams on the fixed roof - it opens and closes like an accordion and functions on a system of air-pillows that lightens the weight.
The unique mobile roof functions on technology chosen by Ove Arup & Partners and allows the roof to completely close in less than one hour. However, the construction phase required detailed attention and precision because strong gusts of wind could have blown away the entire structure. Time management was of crucial importance and therefore the mobile roof was constructed in less than six days.
Source : www.worldstadiums.com
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