They are portable and were used for weather protection.  I'm also wondering if I can make smaller versions of them but don't know what kind of poles they are.  And the clamps I have seen before.
		
		
	
	
		
	
	
		
			
		
		
	
				
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looks like metal electrical conduit
My thoughts toolooks like metal electrical conduit
There are, what I used for my run roof rafters.So I found out there are BENDERS for electrical conduit...learned something new!
I found them on Amazon but they are a bit pricey...There are, what I used for my run roof rafters.
But....the kind of electrical work won't bend a big radius like in your pic.
Look up hoop house conduit benders.