[TowerTalk] elevated anchor guy points

[Tower (K8RI)]

Joe Subich, K4IK wrote:

>  
>
>>Interesting point.  The block that is underground is 
>>approximately 3 feet wide and 5 feet long (in direction 
>>of guy) if memory serves.  Anybody on this list that can 
>>figure the lateral force required to tip this block over
>>from a pipe extending five feet vertically from the center?
>>    
>>
>
>  
>
Remember too that if the soil is clay it will flow and has 
characteristics very much like a high viscosity liquid.  It might take 
years, but elevated anchors set in most clay will eventually shift.
/
/

Roger Halstead (K8RI ARRL Life Member)
Worlds Oldest Debonair (N833R S# CD-2)
www.rogerhalstead.com


>What is the soil's bearing capacity and how deep is the top 
>of the concrete block?  You have several components of force:  
>
>   1) the force required to tip over the block if it was 
>      setting on the surface of the ground 
>   2) the force required to rip the back half of the block 
>      through the cone of soil on top of it 
>   3) the force required to compress the soil below the 
>      front half for the block (to allow the back half 
>      to raise) 
>   4) the force required to drag the block forward through 
>      the soil 
>
>The last three require knowledge of the soil characteristics. 
>
>73, 
>
>   ... Joe, K4IK 
> 
>
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