Bolts
Put the PVC hubs together by threading a 1/4" bolt through the holes, leaving long enough bolts to attach covering
Hubs
Hubs connect all of the struts together to form the structure.
Gumdrops
Connected by gumdrops for small scale experiment
Welding
Connected in the center via welding
Overlapping pipes
Connected by steel pie with bolts, this is a quite good method to be considered.
Overlapping connection with each other. This way might not work due to the scale of the structure.
PVC Hub
Connected by cutting PVC hub as a connector and fixed with cable ties
Bracket
Connected by bracket with bolts through timbers
References:
http://www.ziptiedomes.com.au/
https://makezine.com/2015/04/10/build-functional-geodesic-dome-pvc/
http://www.instructables.com/id/How-to-build-a-PVC-geodesic-dome/
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