We will make them for a variety of bore holes, all with a 2” annular ring
around the edge so it cannot slide once in place and plenty of overlap to
spread out the force.
The idea is that traffic can roll over them and they will stay in place. Not
everyone uses a 12” core drill like we do.
We used to just use plates but traffic would always push them off the hole.
Then we started staking them with a spike into the asphalt, but that is just
more asphalt damage.
Some folks weld a chunk of 10” pipe on the inside that is designed to fit down
the hole, thus the name tophat. But they are heavy, and we have lots of 1.25”
scrap for our three legs. It does the same thing and is much lighter.
From: Bill Prince
Sent: Tuesday, May 19, 2020 12:30 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] possible new product
Maybe my eyes are failing me, but I did not see any dimensions. Is that plate
4", 6" or 8"?
bp
<part15sbs{at}gmail{dot}com>
On 5/19/2020 9:11 AM, ch...@wbmfg.com wrote:
I am building these for myself. They cover core drilled holes in asphalt and
concrete. We call them top hats and are required by many jurisdictions. I
just added the retractable handle and hot dip galvanized this morning. Might
be something we will sell.
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