Construction site preparation

Bottom Stiffener on concrete
Installation of the first ring
Finish of foundation slab
Installation with jacks

Concrete base 

This drawing shows the situation as an example of a standard solution for the connection between tank and concrete base. Further technical possibilities are a separate part for your needs.

With smaller sheets (starter) this system is able to react on changes in the height of the tank in a most efficient way.

The specific details of the concrete base are depending on measurements and size of the tank and the local conditions of the construction site.