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Re: [TowerTalk] Digging a 5'x5'x8' tower footing

To: Jim Lux <>
Subject: Re: [TowerTalk] Digging a 5'x5'x8' tower footing
Date: Mon, 12 May 2008 23:04:09 +0000
List-post: <">>
If my math is correct (only took off the left shoe), the LM-470 requires a base
3.5' X 3.5' X 7.5'. that equals a 4' diameter by 7.5' deep hole.
Now I need to talk to the Tower folks and see if they would sign off on that.
There is a local Tree company that I also need to chat with.
73, Dick, W1KSZ

> Date: Mon, 12 May 2008 13:53:37 -0700> From:> To: 
>> CC:> Subject: Re: [TowerTalk] Digging a 
> 5'x5'x8' tower footing> > RICHARD SOLOMON wrote:> > Let me toss this out for 
> consideration. I too have the situation where I need> > a large hole for an 
> LM-470 base.> > > > I thought about contacting a "Tree Planter" and getting 
> him to use his big> > Auger to bore the hole for the base. I don't think it 
> makes much difference> > if the hole is round or square as long as the same 
> amount of concrete is> > used.> > > > Or am I totally off base here ??> > 
> Nope.. you're right on base. here in Southern California, a lot of > 
> structures (light posts, freeway signs, roller coasters, etc.) get > 
> installed on what are essentially vertical reinforced concrete columns. > 
> Drilled out with a BIG auger, rebar cage dropped in, concrete poured, etc.> > 
> Your engineer can tell you what diameter and depth works for your loads > and 
> soil conditions.
  A lot of times, deeper and smaller in diameter > works better than big and 
flat (it doesn't cost much more to drill a few > feet deeper, once you've got 
the machine there and set up).> > A fairly common scenario here is upgrading 
traffic signals. They'll > jackhammer out the sidewalk on the corner, leaving a 
hole inside the > existing curb about 4x4 feet. Drill a 3 foot diameter hole 20 
or so > feet deep, then set rebar and fill with concrete. Then, the lamp > 
standard gets bolted on top. These have huge canteliever loads (imagine > the 
horizontal crossbar spanning 3 or 4 traffic lanes holding up the > signals)> > 
> They can do all 4 corners in a morning.> > For smaller jobs, they've got 
machines that can do 2 foot piers on a > small skid-steer type carrier (think 
crawler drill for blasting) that > you can get through a 5 foot wide gap 
between house and fence. I don't > know how deep the little machines can go, 
but 10-15 feet is plausible, > but you might have to put an ext
 ension on the shaft.> > > > Jim, W6RMK

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