[bojan]

Guys..
What will be the load on that pier?
100kg max (mount + scope).
No variable side forces, no vibrations.. Floor is isolated so no transmission of vibration to Pier. No freezing of the ground during winter...

As I understand, there will be some sort of housing above (shed)? To prevent wind from affecting the structure during imaging (bars would not help against this anyway)
The only concern may be moving of the whole structure before is settles (after year or two).

Do not over-engineer things...

I have similar structure in the back of my garage in Mt Pleasant.. the hole is 75cm below the top concrete surface, pier is 2.2 m high protruding into the study above the garage. Visibly it didn't move more than 0.5 mm for the year. True, we put 4 steel bars just in case, but I always thought it was overkill.
Yes, when I bump the pier it vibrates for some time.. I don't think I will be doing this while imaging or observing.

Anyway.. see how it goes as is. You can always do something if problem develops.


EDIT: No variable side forces.