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The Eden project entrance portals

The Eden project Cornwall needed three entrance portals into and out of their stage area, and we were asked to design and produce for them.
We rolled the box section into eliptical profiles which could be easily bolted together in 1 meter sections, meaning any portal could be enlarged in 1 meter at a time to the desired length. 
There are five cross braces between each elipse making them very stable structures. 
After assembly the three portals were timber clad by the Eden team and now thousands of people pass under them each year.