Yeah, expanding anchors are just as good as an anchor bolt cast into the
concrete in my experience.
From: Lewis Bergman
Sent: Thursday, August 16, 2018 3:15 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] Mounting large antenna into concrete
Through bolts and a plate is probably ideal but overkill for that antenna.
Sound like a DB224-B. Anyway, I would use concrete anchors like Bill
said.Redhead is a good brand. They also do make a concrete lag that is pretty
big that I have used before but the way those work they are one shot deals. If
you break them free you have to go back with an anchor so don't over torque
them.
On Thu, Aug 16, 2018 at 4:08 PM Bill Prince <part15...@gmail.com> wrote:
Same area; way bigger moment arm. We have put 2' and 3' antennas into
concrete. We used solid standoffs (like this), and IIRC, we used 5" long
concrete anchors.
bp
<part15sbs{at}gmail{dot}com>
On 8/16/2018 2:00 PM, Adam Moffett wrote:
A 20' long rectangle 2 inches wide has slightly less square area than a 2'
dish.
If your mount is comfortably holding a 2' dish then it ought to hold the
20' omni.
Not engineering advice, just an observation about geometry.
-Adam
On 8/16/2018 4:51 PM, Colin Stanners wrote:
So our amateur radio "Wi-Fi" (+similar protocols) group has gotten access
to the roof of a large building where we plan to install mounts outside the
walls of the concrete-walled elevator shack for our smaller antennas.
We have heavy-duty mounts -
http://www.ventevinfra.com/shop/files/products/towers--site-hardwareb/mounting-solutions/Universal%20Wall%20Mount%20Series.pdf
- and I've done this quite a bit at work for smaller antennas (1ft-2ft
dishes). But at this site we have another ham group that wishes to install a
massive antenna, a 20ft long vertical omni.
Does anyone know if having the above pair of mounts lag-bolted (2 inches
deep?) into concrete is strong enough to guarantee no issues with that huge
antenna, or would we need to drill through the concrete and put a plate on the
other side instead?
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