Another consideration is to leave the existing base in place and
excavate a new hole next to it. Then drill and dowel into the old with
rebar to add/bond the old to the new. If you don't fully trust this
approach then make the new part full sized and not dependent on help
from the old even though it will help quite a bit.
Patrick NJ5G
On 8/17/2014 12:27 PM, Kenneth Goodwin wrote:
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 to
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 be
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?
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.
Ken K5RG
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