[R-390] Grounding and CAD Welding

[rbethman]

Don,

We DID use a concentric hammer!  Compacted crushed coral is something 
short of solid rock!

We drove in about two feet at a time, and watched the solid NON-HARDENED 
brass rods start making turns IMMEDIATELY after entering the ground.

I done enough power plants to know HOW to do this.

I've also had arguments with the civil engineers regarding how soon to 
place a boxcar sized, 54 ton generating unit on the concrete pad.  The 
same island, second plant, they placed them within 10 days after pour.  
Sure enough, the pads started to shatter within 45 days.

Bob - N0DGN

2002tii wrote:
> Bob wrote:
>
>   
>> On one particular trip, the "Engineers" deemed that solid brass rods, 12
>> feet long would be used.  Oh GREAT!  Ever see a 3/4" dia. by 12 ft long
>> pretzel?  We raised all sorts of heck - UNTIL they finally sent us the
>> Copperweld rods.
>>     
>
> Well, yeah, if you have dense or rocky soil and try to pound on the 
> end that's 12' in the air.  But that's not how you're supposed to do 
> it.  Put a hammer clamp on the rod a couple of feet from the end, 
> then pound in the first two feet, then move the clamp up a couple of 
> feet and keep repeating.  If the soil is really resistant, you may 
> also need a concentric hammer.  This will get a copper, brass, or 
> bronze rod into any soil I've seen south of Loudon, New Hampshire 
> (where I couldn't get hardened steel tent pegs to go more than an 
> inch into the ground).
>
> I've got clay soil here, and getting 12 feet of 1" copper pipe driven 
> in is not all that much work.
>
> Best regards,
>
> Don
>
>
>
>
>
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