[TowerTalk] Digging a 5'x5'x7' hole in sandy soil

[David Gilbert]

Exactly this.  If the soil is so loose that it can't hold it's own shape 
it most likely isn't going to be able to withstand the compressive 
forces that a normal tower foundation needs to be able to apply without 
letting the tower sink or fall over.

Dave   AB7E



On 8/13/2013 5:25 PM, Steve Jones wrote:
> If your soil is so sandy that your excavation will cave in, you may not be able to use the US Tower foundation design.  Sandy soil might need a mat foundation or an upside-down "T" design.
>
> The US Tower foundation design is for "normal soils" which is defined in the EIA/TIA-222F or G design standard they used.  Normal soil has a minimum compressive strength in psi which sand doesn't meet.  You probably should talk to a local structural or civil engineer about how you may need to modify the foundation design.
>
> 73,
>
> Steve
> N6SJ
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of jeffhook at comcast.net
> Sent: Tuesday, August 13, 2013 3:58 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Digging a 5'x5'x7' hole in sandy soil
>
>
>
>
> To all:
>
>
>
> I have a used US towers HDX 555 I'm installing .
>
> US tower sent me new anchor bolts and a print of foundation and it says undisturbed soil and forms can't be left in hole.
>
> I live in a sandy area and wonder how others have dug a 5x5x7 hole, installed reb ar cage, and filled with concrete, without it caving in?
>
>    
>
> Thanks - Jeff
>
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