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Re: [TowerTalk] Tower Foundation Pad Removal

To: <>
Subject: Re: [TowerTalk] Tower Foundation Pad Removal
From: <>
Date: Mon, 18 Aug 2014 20:16:28 -0400
List-post: <">>
It might be difficult to just add another 3-4' to the base and still
maintain a good support for the tower legs.  I removed a 1 cubic yard base
using a large back hoe and it went very quickly.  There are also jackhammer
attachments for these machines. Lifting it out with a crane is probably no
easy task unless you dig around it first.

John KK9A

Subject:        Re: [TowerTalk] Tower Foundation Pad Removal
From:   K7LXC--- via TowerTalk <>

Date:   Mon, 18 Aug 2014 10:08:48 -0400 (EDT)
List-post:      <">>
>  As part of a tower replacement project, a possible plan is  to remove the
existing foundation in one piece using an infinitely sized  crane attached 
the tower anchor bolts.  The pad is 6.5 x 6.5 X 4 feet  (6 cu yards
estimated).  An effort to break the dirt from around the  foundation would 
attempted (water hose and some penetrating device  inserted down the side of
the foundation pad).  The remaining hole would  be used for the new
foundation installing new rebar as per Rohn SSV  foundation drawings (Rohn
SSV tower, 60 feet using 6N, 5N and 4N twenty foot  sections).  Any reason
not to consider this as a possible plan for the  new tower foundation?
    Sure - if you don't mind spending lots of  money and time only to do 
basically the same thing again. 
    It's easy enough to drill new holes in the  concrete for new anchor 
bolts. If the base isn't big enough, you can enlarge the  hole on 2 sides
add additional rebar by drilling into the existing base and  epoxying the 
rebar in place. BTW the above 6 yards of concrete will weigh  about 24,000#.

    What is your proposed base? Are you doing  this for a different rebar 
schedule or what? I don't see a good reason for doing  this in the info 
>  Secondary question: Do you tie the tower and the rebar  into a ground
connection at the bottom of the foundation?  Years ago one  isolated the
rebar but I think the thoughts today are just the  opposite.
    Putting an Ufer ground in the base is a fine idea.  Google it or dive 
into the TT archives for more info. 
Steve     K7LXC
Professional tower services for amateurs


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