[TowerTalk] Tower Foundation Pad Removal

[Roger (K8RI) on TT]

On 8/17/2014 1:27 PM, Kenneth Goodwin wrote:

Although it was not on a chunk that big and this would not be sufficient 
for that much weight the concept works. We used two 4000# engine hoists. 
Applied lots of tension and the, used two hydraulic drills boring down 
on 4 sides of the base (in clay). Once the holes were drilled, the water 
was left on low flow. More pressure was exerted with the hoists and the 
water flow increased. After a half hour to an hour (don't remember the 
time) a loud sucking sound was heard and the base literally jumped up 
over a foot, releasing the hoist tension.  It took time and patience, 
but worked well.

73 and good luck

Roger (K8RI)


> As part of a tower replacement project, a possible plan is to remove the
> existing foundation in one piece using an infinitely sized crane attached to
> the tower anchor bolts.  The pad is 6.5 x 6.5 X 4 feet (6 cu yards
> estimated).  An effort to break the dirt from around the foundation would be
> attempted (water hose and some penetrating device inserted down the side of
> the foundation pad).  The remaining hole would be used for the new
> foundation installing new rebar as per Rohn SSV foundation drawings (Rohn
> SSV tower, 60 feet using 6N, 5N and 4N twenty foot sections).  Any reason
> not to consider this as a possible plan for the new tower foundation?
>
>   
>
> Secondary question: Do you tie the tower and the rebar into a ground
> connection at the bottom of the foundation?  Years ago one isolated the
> rebar but I think the thoughts today are just the opposite.
>
> Ken K5RG
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk


-- 

73

Roger (K8RI)


---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com