[TowerTalk] New Tower Old Base

[Grant Saviers]

In addition to blowing out the dust, a good steel or brass brush should 
be used to clean the compacted dust from the barrel of the hole after 
drilling.

Blow out the hole, brush vigorously, blow out, repeat.

Rotary hammer drill bits are available up to 36" long, longer than any 
likely need for an anchor.  There is a bit with a tip designed for going 
thru rebar as well as concrete.  $66 for a 1.125 x 17" depth capacity.   
http://www.coastaltool.com/bosch/hammer_bits_spline.htm

Most rental shops will rent the hammer drill but only sell the bits, for 
obvious reasons.

Grant  KZ1W

On 2/9/2011 8:57 AM, K7LXC at aol.com wrote:
>
> In a message dated 2/8/2011 5:58:35 P.M. Pacific Standard Time,
> towertalk-request at 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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