Dome building methods - Tube and hub

The tube and hub is another simple construction technique, slightly more work than the flattened conduit method but is a more professional and flexible system. Instead of joining the struts directly together a larger diameter pipe is used as a hub holes are drilled through the hub and the struts are bolted to it. It comes in a huge range of different designs. No matter what system, they all share same advantage and disadvantage.

Advantage:

• It can be disassembled easily because it is usually bolted.

Disadvantages:

• A lot of hubs needed for the construction and several different types are needed. The cost of adding hub is high, so it is a fairly expensive way to build.
• If the cover is a hard material, there will be a void above the strut and above the hub, which is not desirable

 http://geo-dome.co.uk/article.asp?uname=tubehub

https://www.ziptiedomes.com/2vmanual.htm