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  #101  
Old 27-07-2020, 01:51 PM
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Sunfish (Ray)
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Nice looking legs Joshua. The project is like a rocket launch or a major building. Everything covered in every detail. The environment 9 m up will be cooler for sure and probably more balanced in the day as well as the night. The uplift will be severe in a big wind so I imagine you have some deep concrete under there.
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  #102  
Old 29-07-2020, 11:44 PM
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Thanks Lads,


Mike, cumon... isn't that a tad over the top lol!


Thanks Ray, to hold down the structure, there is about 11.5 tonne of concrete... 8 legs with each having a concrete pile poured underneath it, 600mm diameter and 2000mm deep at least, should give me just over 4m3 in total for the outer frame.
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  #103  
Old 30-07-2020, 09:12 AM
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multiweb (Marc)
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Amazing planning. What kind of crane are you going to be using to erect everything?
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  #104  
Old 30-07-2020, 09:13 AM
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I suppose the structure itself must weigh a few tons also.

Good deep piers below the weather sound good. I suppose it would be a little over the top drilling for rock in that flat stable location but a nuisance if you hit it.

I see each meerkat SKA dish has 8 concrete piles 5-10m deep and that is to stay perfectly located . So you are getting up there.


Quote:
Originally Posted by Joshua Bunn View Post
Thanks Lads,


Thanks Ray, to hold down the structure, there is about 11.5 tonne of concrete... 8 legs with each having a concrete pile poured underneath it, 600mm diameter and 2000mm deep at least, should give me just over 4m3 in total for the outer frame.
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  #105  
Old 30-07-2020, 10:58 AM
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Hi Marc, I will use a bobcat telehandler, it has a 10.5m lift.



Hi Ray, I will hit iron stone quite early where I will be drilling, it might last for about 1m.
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  #106  
Old 30-07-2020, 01:24 PM
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Quote:
Originally Posted by Joshua Bunn View Post
Thanks Lads,


Mike, cumon... isn't that a tad over the top lol!

Not really, I'm a little dubious that your current built in crane might bend under my 140kg frame , so l recon you may well need your Manitou

Mike
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  #107  
Old 04-08-2020, 03:25 PM
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How bout you go up the ladder and I attach the crane to you aswell as a safety in case you go bottoms up
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  #108  
Old 04-08-2020, 03:59 PM
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Quote:
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How bout you go up the ladder and I attach the crane to you aswell as a safety in case you go bottoms up
Deal
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  #109  
Old 10-08-2020, 06:49 PM
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Been a full on 2 weekends.
I got the 8 holes drilled for the outer frame, 4 holes drilled for the inner frame and 8 holes drilled for the solar panel frames. They were all concreted aswell. Good to have that done.
Used a long rope from the telehandler to find north


Josh
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  #110  
Old 10-08-2020, 07:02 PM
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Some more
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  #111  
Old 10-08-2020, 07:32 PM
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Anth10 (Anthony M)
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Quite a project Josh/ an engineers delight- this is going to be some observatory!

Power to you.
Anth
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  #112  
Old 10-08-2020, 07:56 PM
croweater (Richard)
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Pretty sure those solar panels won't blow away Joshua. Every now and then an epic project comes up on this forum. The last one for me was Stefan Buda's telescope. Now this beauty! Love it and looking forward to seeing the end result.
Cheers, Richard
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  #113  
Old 10-08-2020, 08:06 PM
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Thanks Anth and Rick.
Stefans' project was an interesting one for sure.

Funny you say that about the panels Richard, as the solar panel frames got blown off their chocks before concreting yesterday, the wind was that bad.
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  #114  
Old 10-08-2020, 08:48 PM
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Nothing quite like finishing a set of drilled and filled pier footings. Must be very satisfying. I like your set out technique with the welded bar. Did you batch the concrete on site ?
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  #115  
Old 11-08-2020, 12:44 AM
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Absolutely Ray, very satisfying indeed, especially when you only end up with 40 or so liters of left over concrete. Yes this is batched on site.
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  #116  
Old 11-08-2020, 10:18 AM
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You've got some serious gear, hydraulic auger attachment and all.
Your site looks very exposed with the wind. You've mentioned the solar panels catching up. How bad does it get there? Are the footings going to be enough or are you going to hand some kind of weight under the tower to minimise sway and vibrations?
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  #117  
Old 11-08-2020, 12:24 PM
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Excellent
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  #118  
Old 11-08-2020, 02:38 PM
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Thanks Trevor and Marc.


Marc, yes it's quite a windy site, but placing it up high on a mound I'm hoping it will help with seeing conditions. The outer frame can sway a bit that's not a problem, the inner frame which is the Square pyramid (my "pier") does not touch the outer frame at all and there is not much of a sail area for that to catch the wind.it is held down well and extremely rigid. As for vibrations on it, we will see. I can always clad the outer frame to deflect wind away from the ones frame.
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  #119  
Old 11-08-2020, 04:13 PM
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Quote:
Originally Posted by Joshua Bunn View Post

Marc, yes it's quite a windy site, but placing it up high on a mound I'm hoping it will help with seeing conditions. The outer frame can sway a bit that's not a problem, the inner frame which is the Square pyramid (my "pier") does not touch the outer frame at all and there is not much of a sail area for that to catch the wind.it is held down well and extremely rigid. As for vibrations on it, we will see. I can always clad the outer frame to deflect wind away from the ones frame.
Not really worried about the tower itself as it doesn't present a big surface area to the wind but your box at the top will. Just thinking of keeping the center of gravity of the whole build as low as possible. If your solar panel frame was enough to move with no panels on it must be blowing a gale out there. Imagine with panels.
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  #120  
Old 11-08-2020, 07:00 PM
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Yes, the box at the top does, but I have used the correct amount of anchoring (concrete mass to depth) so it will stay put, and the frame, well that's strong enough. The solar panel frames moved because they were not concreted in yet 🙂
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