On Tue, 4 Sep 2001 Jon Ogden <firstname.lastname@example.org> writes:
> > On Tue, 04 September 2001, Jon Ogden wrote:
> > Use the concrete base plate BPC25G. No hinges.
> > Designed for a single pier pin.
> OK. Now I've had two people suggest a single bolt. Why a single
> one? And should it be mounted flat against the concrete or should
> a nut be put on the bolt between the concrete and the plate?
> Jon NA9D
A single pier pin allows the tower to twist when torqued by winds
acting on off center loads. This is a concern with tall towers and
multiple (side mounted) loads. With a house bracket and small load
this is not likely to occur in your installation. You want the flat
to rest on the concrete to support the off center legs. Ideally, the
concrete pad would be sloped away from the plate to allow water
to drain off. As long as water does not stand long after it rains,
it will 'probably' not rust. I suppose you could put some pressure
treated 4X4's under the plate if you want to get it up from the slab.
BTW, W1EVT has 19 R25 140 ft towers with flat base plates sitting
on top of concrete blocks to place each tower base at the same
elevation on his hill top. There are NO bolts or anything else to
prevent lateral movement. This is not a problem since there is
very little lateral force at the base of a guyed tower.
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