[TowerTalk] Small free-standing to Bigger free-standing
Wed, 29 Mar 2000 11:54:30 EST
In a message dated 03/29/2000 8:40:35 AM Pacific Standard Time,
> Have you ever tried to break up a buried concrete base
> with an electric jack hammer? It can't be done.
> Believe me, I've tried. You won't even dent it.
> When I left my Ohio QTH, I spent big bucks renting
> a Bobcat with a nitrogen powered hammer on a
> big arm that only managed to break up the base
> down to the point where I could hide it with 0.5
> inches of top soil.
> To break up the base, you'd have to lift the thing
> out of the ground. But to do that, you'd have to
> dig around it anyway. Either way, its a lot of work,
> but I'd go for drilling the holes needed for the
> rebar to tie it to the expanded foundation.
Hi, Pat --
Thanks for your 'real life' comments. I've only been around a couple of
instances where the rented jackhammer technique was applied but it seemed to
work. Perhaps they were working with 3kpsi concrete and yours was 5kpsi or
something. I don't remember how much of the concrete they removed either.
For commercial jobs I've hired a backhoe that had a jackhammer on it. He
not only broke up the concrete but also picked it up and hauled it away.
But maybe for the effort involved, using Hank's method of rebar-coupling
is the way to go. And thanks to the great group at TowerTalk, we've got some
real comments and options that'll make it work.
Cheers, Steve K7LXC
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