[TowerTalk] Tower base over ROCK (shale) experience??

[Grant Saviers]

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 at kk9a.com" <john at kk9a.com>
>> To:towertalk at contesting.com
>> Subject: Re: [TowerTalk] Tower base over ROCK (shale) experience??
>> Message-ID:<a7b321e60b988123119f0f2cdfaa712f.squirrel at 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 at embarqmail.com>
>> To:towertalk at contesting.com
>> Subject: [TowerTalk] [WARNING: A/V UNSCANNABLE]Tower Base Over Rock
>> Message-ID:
>>     <1143098131.95471500.1507909044009.JavaMail.root at 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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