I agree that it is the mass of the concrete that holds many structures.
Look at the large width of Rohn SSV bases. In this case I would not be at
all concerned about disturbed soil along the sides of K9LTN's tower base
installation because it is a pier pin base!
John KK9A
Jim Lux wrote:
There are plenty of examples of concrete bases that are formed and
backfilled. Think of it this way - if you built a huge concrete base that
was sitting on the surface, that was sufficiently large to handle the
overturning moment of the tower, then you're not depending on the
surrounding soil to hold it in place. There's some pictures out there of
wind turbine mast bases that are enormous, and they're sure not depending on
the surrounding soil. They *do* depend on the soil underneath the base not
collapsing under the load.
Some years back on TT, there was a discussion about unusual tower bases that
looked like an X - with longish beams extending out from a central base.
With enough reinforcing to take the bending moment, you can do this and have
a fairly shallow base. If you had a cheap source of big steel I-beams you
could use *those* as the arms, and just cover the beam with enough concrete
to protect it.
On Sat, 5 Apr 2025 21:26:46 -0700, "Steve Jones" <n6sj at earthlink.net>
wrote:
I wonder how it made it through the recent tornadoes...
Can't imagine excavating a big hole, forming up the concrete, and
back-filling it! My foundation was poured into undisturbed soil.
Like the wood-burning stove in the shop!
73,
Steve
N6SJ
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