In a message dated 98-06-30 22:31:54 EDT, designserv@ipass.net writes:
> > If you're talking about using 2 screw-
> > ins per anchor, that should give you enough capacity.
>
> OH? Under what conditions? The load on a screw anchor is
> distributed through a volume of soil. Just how far apart in which
> direction were you going to spread these so the affected volumes
> do not overlap? How were you going to share the load and what
> does that do to the axes of the screw anchors?
>
> I think screw anchors are alright if they are properly imbedded in
> enough concrete. Have seen too many fail when soil got wet and they
> were not in concrete. Don't like them. Don't trust them. Period.
>
I'm not a fan either. My statement was based on the fact that if one is
rated at 2500 lbs., then two must be rated somewhere around 5000 lbs. Since
3'16" EHS has a breaking strength of 4000 lbs., that might be in the range of
the capability of two properly installed screw-in anchors.
Or not.
Cheers, Steve K7LXC
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