A little confusing to me what "solid shale" means. If it really is
shale (from what I know as shale in WPA, OH) then a carbide tipped drill
will make quick work of drilling holes big enough and deep enough to
hold a grouted or epoxied pin anchor for your guys. Several pins could
be the sliding prevention anchors for the tower base. Then the
question is how strong is your "solid shale". Shale is a complicated
(anisotropic) rock and varies enormously site to site.
This to me sounds that you really need a soils engineer and PE.
Grant KZ1W
On 10/13/2017 9:42 AM, bear wrote:
From:"john@kk9a.com" <john@kk9a.com>
To:towertalk@contesting.com
Subject: Re: [TowerTalk] Tower base over ROCK (shale) experience??
Message-ID:<a7b321e60b988123119f0f2cdfaa712f.squirrel@www11.qth.com>
Content-Type: text/plain;charset=utf-8
I have all tapered bottom pier pin bases with star guys and I never
heard
any noise or saw base movement. It is important that the concrete
base can
handle the downward force and that it will not slide sideways. The tower
anchors are extremely important so you still have the challenge of
digging
those three holes though the shale, following the factory
specifications.
John KK9A
John,
This has been a big hold-up.
The guy anchors.
My thinking has been anchor reybar IN the shale, pour concrete, guy
point then being part
of the reinforcing structure. AKA, have to pull out and up the shale
for a failure. SO, how deep
or over what surface area/how deep does one have to sink holes into
the shale??
There's no "digging" through a solid shale surface that shows scrapes
from glaciation! :D
(been there a long time)
Date: Fri, 13 Oct 2017 11:37:24 -0400 (EDT)
From: "Wilson Lamb"<infomet@embarqmail.com>
To:towertalk@contesting.com
Subject: [TowerTalk] [WARNING: A/V UNSCANNABLE]Tower Base Over Rock
Message-ID:
<1143098131.95471500.1507909044009.JavaMail.root@embarqmail.com>
Content-Type: text/plain; charset=utf-8
If you actually have solid rock, why have a base for the pier pin at
all?
Seems one would drill for the pin, set it in epoxy or cement, and be
happy?
WL
No go.
The ground aka shale surface is non flat, in most places it is
sloping, but even on the flat, it is not flat...
and I still need to make the base hinge and tilt over...
(that is still possible with the pin, with some modification to the
tilt base scheme, or so it seems)
_-_-
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