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Replies: 23
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CU Medallion [64837]
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Advice needed: Heavy Equipment Anchoring and Core Drilling..
Oct 1, 2020, 9:54 AM
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Okay ladies, Here's the situation:
We have a large piece of equipment that is anchored into a 48" thick concrete mezzanine. There are 10 M48 anchors, three on one side keep breaking (1 is a j bolt and the other two are thru-bolted). At various times over the past few years, the anchors have broken. The thru-bolts had epoxy poured in the hole, which has them FIRMLY in place. Weld repairs were made as quick field-repair. Yes I know that this weakens the anchor, but it was our only option. Every 6 months or so, a stud will break in the heat affected zone of the weld. We just grind and re-weld and get back on down the road.... it's not really a huge issue IMHO. Management wants it fixed...
I want to remove the two thru-bolts and replace them with new, larger anchors. Whatever we bring in to drill these out need to be able to drill the steel anchor as well as the concrete/epoxy. I don't think you could lance out the steel anchor, because the heat would destroy the concrete. Maybe we could increase the size enough so that we could core around the anchor? The alternative would be to drill new holes adjacent to the existing studs and add additional ones... but I just don't want to do that (because I'm stubborn).
Lifting the equipment, redoing grout and anchors has been quoted between $250K and 500K... boss mayne ain't going for it (and I don't blame him).
Advice? Experience? Dumbazzjokes?
FYT:
Message was edited by: ryanadidas®
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CU Medallion [53532]
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Re: Advice needed: Heavy Equipment Anchoring and Core Drilling..
Oct 1, 2020, 9:58 AM
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when you say they break on one side, I picture a cantilevered load.
If so, any potential to counterweight? Still need to replace anchors as you say, but future stress/wear could be limited.
+1 for jiggles
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CU Medallion [64837]
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No cantilevered load. It's a 900T reciprocating shear.
Oct 1, 2020, 10:07 AM
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Here's my theory on the 1 side having issues:
#1 stud broke for whatever reason... insane impact and vibration from the process, constant overloading the equipment, the fact that it's on a mezzanine floor... God only knows.
Adjacent stud broke because nobody reported the first stud being broken for a while.
Same with 3rd stud.
Once weld repairs were made, they're just weaker.... how much weaker? Who knows, but it's significant. So from that point on, those three just keep breaking every 6 months or so.
We can prep, preheat, weld, and post heat a broken anchor in about 6 hours, so it's not a HUGE issue, but I'd like to make it go away.
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CU Medallion [53532]
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Re: No cantilevered load. It's a 900T reciprocating shear.
Oct 1, 2020, 10:24 AM
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In that case:
- bigger hammer
- sky hook
- window stretcher
- milk in freezer
- large anchors, use inconnel or waspaloy stud material next time
good luck though
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All-In [40970]
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You need to hire a structural engineer to look at it
Oct 1, 2020, 10:04 AM
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something else is going on. Typically in similar situations, I would add new anchors close to the old anchors with epoxy and threaded rod.
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CU Medallion [64837]
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Why hire a structural engineer when I can ask you yahoos
Oct 1, 2020, 10:08 AM
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on here for free?
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Oculus Spirit [86119]
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CU Medallion [64837]
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All I can afford is LineX In your expert opinion will that
Oct 1, 2020, 10:26 AM
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work?
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Oculus Spirit [86119]
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I would have a painter apply one coat per day
Oct 1, 2020, 4:19 PM
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for 60 days.
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Oculus Spirit [79508]
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Heisman Winner [138439]
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Ever seen a truck fully Rhino Liner'd?
Oct 1, 2020, 10:39 AM
[ in reply to After you repair the welds, try applying a heavy coat of ] |
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Friend of a friend did this to his truck (don't even remember what brand the truck was). Actually looked pretty slick, and apparently, it added almost 200 lbs. to the truck. Wish I had taken a pic now.
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Heisman Winner [138439]
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Looked close to this.
Oct 1, 2020, 10:40 AM
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CU Medallion [53532]
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Re: had a friend that did that to his old Jeep "crawler"
Oct 1, 2020, 10:43 AM
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Street legal, and rarely offroad "crawler."
Nice to just hose it down inside and out when it does see mud though
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Orange Blooded [2894]
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I'm a structural engineer. Tmail me some photos of the issu
Oct 1, 2020, 10:32 AM
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e and maybe I can help you out.
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All-In [44107]
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Simple and easy solution:
Oct 1, 2020, 11:10 AM
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By 40 gallons of JB weld and go to town. That structure will survive anything.
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CU Medallion [66416]
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Why are they breaking ? Is it from the machine
Oct 1, 2020, 11:15 AM
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motion or floor expansion/contraction ?
I assume this thing is heavy af and weighs north of 5000kg. If not, then M48s are more than enough and there's a major issue. Stop welding on the anchors and fix the problem.
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CU Medallion [64837]
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Re: Why are they breaking ? Is it from the machine
Oct 1, 2020, 11:35 AM
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Machine motion is the issue.
Weight is north of 50T.
That's the idea: to replace the welded anchors. The question is "how".
I'm wondering if we couldn't core/bust down about a foot, clean up the "good" non heat-affected area of the stud, thread on a nut sleeve and add a new piece of threaded rod. Fill with epoxy and head on down the road. like this: https://www.portlandbolt.com/products/nuts/hex-coupling/
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Heisman Winner [105998]
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Have you tried Gorilla Glue
Oct 1, 2020, 11:28 AM
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to make your balls stick to your thigh?
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CU Medallion [64837]
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I prefer to use Seamen.***
Oct 1, 2020, 11:38 AM
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All-In [46930]
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I know this isn't my department, but hear me out...
Oct 1, 2020, 11:38 AM
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duct tape.
YWIA
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CU Medallion [64837]
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Posts: 22718
Joined: 9/27/04
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All-In [46930]
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I mean if you need some I got some extra
Oct 1, 2020, 11:47 AM
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under the old Delta 88 out back I put down when there's a hurricane coming
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CU Medallion [64837]
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Delta 88???
Oct 1, 2020, 11:49 AM
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All-In [46930]
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First class white trash***
Oct 1, 2020, 12:18 PM
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Replies: 23
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