Anchors Embedded in Concrete Base - Self-Supporting Tower

[Sparweb]

Hi,
I am looking at the installation data for a self-supporting tower (Wade DMXHD-48N).
Link
Embedded into the concrete base are 3 extensions of its own legs, which are "W" shaped formed channels.
I thought that connections to a concrete base were properly done with anchor bolts set in the concrete, and that the legs should have interface plates to fit the threaded ends.
Is embedding the channels into the concrete "just as good" as the anchor bolts, or is this a unique thing that only works under these special circumstances?


STF

 

[oldestguy]

I'm a ham radio operator and have been involved with several ham tower projects. While it may be difficult to specifically figure bond and other factors, I find that burying one section somewhat "does the job". It costs more that anchor bolts however. The usual problem is how big to make the foundation.

 

[KootK]

We usually use anchor bolts etc simply for constructability. It allows the steel to arrive on site well after the concrete is poured and facilitates plumbing of the superstructure. If an embedded solution works by the numbers, I can think of no mechanical reason to avoid it.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[JStephen]

No opinion on this particular item, but I will point out that on the big galvanized monopole transmission towers, some of those are built with a ring of anchor bolts exposed, some just have the pole going directly into the concrete. So the concept is not unknown.

 

[Sparweb]

Thanks.
It's reassuring to see that it doesn't raise red flags.
Of course, this is a very common tower, so any real problems should have surfaced by now.

STF