[TowerTalk] Sand Stone

[Patrick Greenlee]

I rented a skid steer Bobcat with a 500 lb hydraulic hammer chisel on 
front as an implement to square off excavations in sandstone that broke 
the 4 ft bucket off the track hoe.  Fun and i interesting toy to 
operate.  Highly recommend it if you have to dig a hole and find too 
much rock.

Patrick   NJ5G

On 4/15/2015 1:45 PM, Steve Jones wrote:
> Kent-
>
> Sounds like you're on our Butano Sandstone Formation here in the Santa Cruz
> Mountains.
>
> When I put up my UST HDX-589 I had the same soil conditions.  I hired an
> outfit with a small excavator to dig the hole square with vertical walls.
> All the backhoe operators said they couldn't dig vertical walls and would
> need to dig a big pit and form up the concrete foundation within the pit.
> That's not how the structural engineer designs these foundations, which
> depend on the friction of the concrete with the "undisturbed soil" on the
> vertical walls to provide part of the resistance to overturning moments.
>
> The excavator operator had a jackhammer attachment for his machine that
> broke up the really hard sandstone.
>
> If you're in the Bay Area, call Andreini & Sons in Half Moon Bay.  They did
> a great job for me.
>
> GL es 73!
>
> Steve
> N6SJ
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Kent
> Olsen
> Sent: Wednesday, April 15, 2015 8:43 AM
> To: TowerTalk at contesting.com
> Subject: [TowerTalk] Sand Stone
>
> Hi all
>
> I am putting up a used US Tower HDX-572MDPL. I started digging the hole (yes
> by hand) and got about 2 1/2 feet down and I hit sand stone. My neighbor who
> has a back hoe and has done a lot of digging in my area says he can dig the
> hole. My question is will the sand stone be much more stable than just the
> soil? Is there any thing I need to do because of the sand stone as far as
> the foundation?
>
> Thanks
> 73
> Kent
> K6DKO
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