[TowerTalk] Crank-up base

[Mike Reublin NF4L]

Grant -

He said depth was more important than width, citing "pier effect and overturning moment of a lever". Who knew?

Mike

On May 1, 2014, at 12:32 AM, Grant Saviers <grants2 at pacbell.net> wrote:

> Your engineer can design a spread base that handles the load.  More concrete, wider, but about 3' deep as a guess.  It is an alternative I considered for elevated guy anchors.
> 
> Grant KZ1W
> 
> On 4/30/2014 5:20 PM, Mike Reublin NF4L wrote:
>> I'm negotiating to get the base for my HG70-HD dug and poured. I have a high water table, soil tends toward sandy, and an engineer said he would be happier if the hole were 10' deep rather than the 7.5' called for in the manual.
>> 
>> The concrete guys I'm talking to want to line the hole with plywood to prevent collapse. One guy who does a lot of big sign installations says he does it regularly, and there would be no stability issues.
>> 
>> I've read several times the pour needs to be into undisturbed soil, no backfill, altho that's not in the manual.
>> 
>> What are the facts?
>> 
>> 73, Mike NF4L
>> 
>> 
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>