I sure hope so Bob K3DJC
On Tue, 18 Apr 2017 18:10:48 -0400 "Terry Posey" <[email protected]> writes: > I expect that the Moderator will be ending this Off Topic soon. > > However: > > One of my clients operates a large 90 tower (all self-supported) > microwave > system here in Florida. Florida is often regarded as the lightning > capital > of the world. I have helped my client with repairing damaged > (cracked) > tower foundations. Approximately $1 Million have been spent over > the last > five years repairing concrete foundations that have embedded Ufer > rods in > addition to an extensive external grounding system comprised of > radials and > soil driven rods. No repairs have been needed to any of the tower > foundations that do not have Ufer embedded rods. > > I have noticed that the damaged foundations cracks seem to appear > after 15 > years of service. This could be evidence of long term repetitive > internal > stresses - perhaps stresses resulting from steam expansion of the > concrete's > internal moisture due to repetitive high energy lightning pulses to > the Ufer > rod. Of course, none of that thought is easily provable. > > In the meantime, I do not include Ufer ground rods in any tower > foundation > designs that I have professional responsibility. > > Terry K4RX > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
