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3rd floor observatory pier design

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#26 HunterofPhotons

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Posted 18 May 2021 - 10:55 AM

And in general, an observatory on top of a building or especially a house, usually isn't a good idea. Heat plumes going up from roofs and especially up staircases and access ports could be very problematic for local seeing.

 

Exactly.

Why aren't you building a detached observatory in your yard?  It's much cheaper, easier to build, won't hurt your house resale, and when all is said and done you'll have better imaging/viewing conditions.

 

dan k.



#27 555aaa

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Posted 18 May 2021 - 03:43 PM

Exactly.
Why aren't you building a detached observatory in your yard? It's much cheaper, easier to build, won't hurt your house resale, and when all is said and done you'll have better imaging/viewing conditions.

dan k.

Agree but I’d still like to have one. I’d probably also use it for solar.

#28 archer1960

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Posted 18 May 2021 - 06:47 PM

Exactly.

Why aren't you building a detached observatory in your yard?  It's much cheaper, easier to build, won't hurt your house resale, and when all is said and done you'll have better imaging/viewing conditions.

 

dan k.

That would depend on what is around the yard. Trees or tall-ish neighboring houses could make a ground-level obsy largely unusable.



#29 deonb

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Posted 18 May 2021 - 07:12 PM

Exactly.

Why aren't you building a detached observatory in your yard?  It's much cheaper, easier to build, won't hurt your house resale, and when all is said and done you'll have better imaging/viewing conditions.

 

dan k.

Already have a detached one. As it is right now, the scope has to look over the roof anyway towards the south. In terms of resale value, the design is such that it is easy to change the dome to a widow walk.


Edited by deonb, 18 May 2021 - 07:14 PM.


#30 deonb

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Posted 18 May 2021 - 07:14 PM

Finally you can also float the pier itself right off of the walls or floor of the top story, provided that it's strong enough, using cable loop isolators. It's tricky but doable. Ignore the haters.

Can you explain a floating pier? I can't find a design for it.



#31 555aaa

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Posted 19 May 2021 - 03:02 PM

Can you explain a floating pier? I can't find a design for it.

So ideally what you do is build a floor that attaches to the walls using vibration isolators (the big wire rope ones) and you put a big weight in the bottom of the floor placed so that it more or less counterbalances the weight of the telescope plus pier. The pier bolts to this floor. Then you build the walking floor over that floor, but separated. What you want to achieve in terms of engineering is lateral and vertical compliance with no tipping, hence the weight at the bottom.

 

It might turn out however that a normal concrete construction method would work fine at your location, soil condition, and wind loading.  Are you familiar with this formless construction method using foam blocks? They are called ICF Insulated Concrete Forms. Might be worth considering. Are there any problems with ground transmitted vibrations now? Is there a high wind load on the (proposed) building?




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