Clay: Hit return too fast. Add in the 2 legs for the same panel distance. The areas are the diameter of the item times the length (exposed area). Hank _______________________________________________
Whoa! This is getting a bit thick now. I can assure you that this is not the cause of any power under a base plate. Not to keep this thread going but it is getting into the realm of extremely bad sci
Chris and others Google "Hilti" or "Powers Fasteners" you will find all the information you need on epoxy adhesive bolts or anchors. Epoxy bolts are the worst thing you can use in a situation where t
Steve: Go to www dot us dot hilti dot com Then "products" Then "adhesive & mechanical anchoring" Go to www dot powers dot com Then "mechanical anchors" or "adhesives & foam" The info is there. Hank /
TT: Sorry for the bandwidth but a short response to a query To the gentleman who asked me about suppliers of exothermic welding supplies; I lost your e-mail but the following is a list of the supplie
Bob and TT: What you need to do is have the engineer specify and design for less than 3000 psi. The special inspection section of the CBC ( California Building Code) (essentially the 1997 UBC) doesn'
Carl and TT: The dead load of the tower section for the 40' is a minor factor in this case. The max vertical load comes from the vertical guy force vectors not the weight of the tower in this case. 4
Jim / Paul / Doug and list: I have been holding back from responding to this thread as I have responded to this idea in the past, but I just couldn't hold back any more. The exploding concrete concep
List: The "Building Code Requirements for Structural Concrete" ACI-318-05 section 7.7.1 - Cast-in-place concrete (nonprestressed) states "The following minimum concrete cover shall be provided for re
Julio: What they are suggesting is higher strength concrete 25Mpa which is about 3600 psi. The air is air entrainment. 5% is the value you should look for. This will improve the conrete's durability
Jim/Steve etal: You forget that this is just the air mass density force at a velocity. There are modifiers beyond Cd (drag/shape) that need to be taken into account which modify the force due to heig
Mike etal: All this talk got me curious about the loading capacity of the 48' HDBX. When I was engineering the tower installation for K9CT's new station, he requested using 64' BX towers for the 80m
Glen: The alloy call out is actually ASTM F1554 Gr 55. These are carbon steel anchor rods (newer terminology) with 55,000 psi yield strength. There is no need and it is not recommended by American Co
Steve: Yes you are correct wrt the double nut. I also callout for the threads to be spoiled below the bottom of the lower nut. Belt and suspender philosophy. Foundations are relatively less expensive
Rick: Not really the crushing starts to be a factor when you approach a right angle (90deg bend). Regards Lonberg Design Group, Ltd. H. S. Lonberg, P.E.,S.E. / KR7X Principal Again, remember, I had a
Jerry: Where on the current Universal Tower web site did you find the 21sf at 110mph rating for the HD-21-50 rating? All they say there is if your antenna is xx SF go down the list that has the same
Mario: That is nice but all your reference document links say 80mph, 90 mph etc. but do not say what exposure, whether the wind velocity is fastest mile or 3 sec gust or what loading specification th
Steve: That was Mark's (W7ZB) tower installation. I got the welders AWS certificates from Rohn as part of the permit application. It was the city of Beaverton and they did not back down until an ARRL
In that case you had better tell all those concrete dams that have been built that they should not be holding back those reservoirs as they do. Regards Lonberg Design Group, Ltd. H. Lonberg, P.E.,S.E
Dave: The comment was meant to make you think about what you purport to say is true when it is not, in the context you use. Concrete does indeed have pores and they are very small in relationship to