How deep to dig for pier base!

[laser_jock99]

All that concrete for a wooden post? You're joking surely?

[Gina]

Overkill is one thing but that's taking things to the extreme

[Ptarmigan]

taking things to the extreme

Oh I dont know , , I mean geothermal renewables is all the rage these days , , so why not put the warm room underneath instead of alongside ?  :)

[Ptarmigan]

^{ducting that will carry the services.}

:)

"ashes to ashes" "dust to dust"

with Chopin op35 in B flat minor (funeral march)

[Freff]

He's 'aving a laff.....that's one of those 3D pavement chalk artwork things that makes you think your heads on backwards.

[nightvision]

Could it be?

[Ant F]

with all that concrete surely the earth will topple off its axis lol

[Ptarmigan]

Burial chamber for 10,000 terracotta astronomers ?

[Ant F]

maybe its a D.U.M.Bs  ( deep underground military base ) lol

[RichM63]

I've just given permission for EDF to remove a couple of concrete electricity posts from my land.

However one of them is in the perfect spot for an Obsy. 

Post set in concrete at least 15 feet underground.

All I need is for them to agree to cutting the post rather than extracting.

Failing agreement, I'll have them leave it and chop it down myself.

Could be hairy.

Rich

[Laurie61]

You will need a good scope to see the stars from down there 

[Ant F]

you will need a cherry picker to get outta there.

[Mukv]

Greetings

Just my bit of fun guys, this is just a structure for drainage for the house in the background of the earlier picture. Maybe my next obsy will be built this way....!

My mate having his turn casting out the hole!

have fun guys

Andy

[Gina]

[Astrobug]

Juft for the info, this was my hole.

1.2m deep on 1.5mx1.5m wide. 

The foundation sit on a 20cm layer of "stabilisé".

How much concrete do you plan to use? I was at 1000kg.

[Ptarmigan]

just a structure for drainage 

Nah ! You're just trying to throw us off the scent,

what it really is, is the start of a mine shaft at the bottom of which you are going to put your Neutrino Observatory :)

Or perhaps once that chamber is roofed over and sealed you are going to keep your Dark Matter in it ?!

 heheee.

[dmahon]

Juft for the info, this was my hole.

1.2m deep on 1.5mx1.5m wide. 

The foundation sit on a 20cm layer of "stabilisé".

How much concrete do you plan to use? I was at 1000kg.

1000Kg?

1m³ is approximately 2400Kg. You should have used six and a half tonnes.

[Astrobug]

The base of the concrete was 1.5x1.5 filled with 20cm of stabilisé. The concrete itself is 0.7x0.7m and 1m deep.

[kev]

Exactly what r u mounting on this? Lowell refractor? stop digging.

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[kev]

Ps wife says the hole would make a good koi pond.

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[nameunknown]

..going for southern sky too?

[A40farinagolf]

At about £80 per tonne you'd make a fortune out of landfill tax and you cold extract the methane in a few years time.

Has anyone got any drawings for me to make a pier for my CPC925?

[mattias]

Hi!

Always check the frost levels in your area, because it can differ by meters from location to location even within a country. In Sweden, we have frost level maps available, and I think you might have this for UK as well. Where I live, around 60 deg (in the middle of Sweden, with winter temperatures between -5 -15), the frost level is around 2 meters and that means that you should dig slightly deeper than this to be sure not to get any movements on your pier or whatever you build with concrete base.

Then you could, as an extra insurance, place 100mm styrofoam just under ground and at least 1-2 meters on each side to prevent frost to move downwards thde soil.

The big job is about digging, and you could always rent a mini excavator if lazy like me.

The pier could be 20-24 cm in diameter, with steel inserts and a concrete box base maybe 60x60x20 cm. don't forget to lay geotextile under it if unsure of the base.

I think that this part should be the part where you spend most money and time. Then you will have a pier that stands still forever!

Here is an example of such frost level map. The numbers indicate frost free level in meters.

Good luck

[saac]

I'm so disappointed I was looking forward to seeing the telescope that attached to the mount that sat on the pier that went into that hole.

Jim

[Tinker1947]

Frost, last winter from memory in Norfolk, UK,  we had 3 mornings with frost as for the ground freezing if it does its going to be in inches just a couple.....