[TowerTalk] Size of TX-455 hole

[David Greer]

Thanks to all who responded to my question about the proper size of the hole for a U.S. Tower TX-455 55-foot free-standing tower. I spoke on Saturday morning (Yes, they work Saturdays on contact jobs.) with Dave Chance, an engineer at U.S Tower. He answered all my questions. First, I should dig a 5x5x6 foot hole for the TX-455. They send out different engineering specs for different parts of the country depending on soil types, he told me. In other words, ignore the chart on page 4 of their catalog listing hole sizes for various tower models. He told me not to connect the anchor bolts to the rebar cage. They want the tower's stresses transmitted to the concrete and not the rebar. And he told me that if I use the leveling nuts under the T-base, grout is not needed under the base. The engineer specs state that but I thought the language used was still a bit unclear but he cleared it up for me. I mention these last couple items because they go opposite from what I was told by a few fellows on the reflector. But Dave also said that each P.E. has his own ideas about what works best on nearly all these points.  73, Dave, N4KZ

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