I posted this earlier but it didn't make it through, here goes again.
If it is guyed tower then epoxying in anchor bolts should be a good solution
provided they are sized properly.
If it is a self supporting tower it is a different ball game and it would be
wise to have the tower connection
to the concrete footing reviewed by a structural engineer. There is tremendous
stress exerted on the anchor bolts
of a self supporting tower. If the tower is 70 feet high, visualize a 70 foot
pry bar pulling on the anchor bolts. The anchor
bolts are a critical part of the footing design. The anchor bolts for my self
supporting tower are 1 1/4" dia by 3 1/2 foot long J bolts with a 6" hook on
the end end cast in the concrete.
73,
Bob
K6UJ
On Feb 9, 2011, at 9:12 AM, Michael Goins wrote:
> Even if unguyed, Steve? Surely not.
>
> Mike, k5wmg
> Pipe Creek, Texas
> A thousand words a day. Five days a week. For life.
>
> *
> *
> *
> *
>
>
>
> On Wed, Feb 9, 2011 at 10:57 AM, <K7LXC@aol.com> wrote:
>
>>
>> In a message dated 2/8/2011 5:58:35 P.M. Pacific Standard Time,
>> towertalk-request@contesting.com writes:
>>
>>> I will be upgrading my tower and will be using my existing base. This
>> will
>> require drilling the existing concrete base and epoxing in some new bolts.
>> I would be interested in exchanging some emails with someone who has done
>> this.
>>
>>
>> This is covered in my UP THE TOWER book (available from
>> _www.championradio.com_ (http://www.championradio.com) ). As is a
>> picture of the XE2DV
>> super station on the Sea Of Cortez.
>>
>> In short (assuming the existing base is big enough for the new tower),
>> rent an impact hammer and an appropriate sized diamond drill bit (for
>> cutting any possible rebar) and drill where the new holes go.
>>
>> Blow the dust out of the holes (a big straw or can of compressed air
>> work FB), use contractor's epoxy in the hole, wait for it to cure and
>> you'll
>> be good to go. You'll need a special 2-barreled gun for the 2-barreled
>> epoxy cartridges. You can probably rent all of these at your local rental
>> store.
>>
>> Contractors do this every day and the epoxy is stronger than the
>> concrete so no worries about strength.
>>
>> Cheers & GL,
>> Steve K7LXC
>> TOWER TECH
>> and
>> Champion Radio Products
>>
>>
>>
>>
>> _______________________________________________
>>
>>
>>
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>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
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