How to remove concrete anchors
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- čas přidán 24. 06. 2023
- In this video I remove some concrete anchors, sometimes called thru-bolts. It’s important to remove these when they become redundant, as they pose a serious tripping hazard.
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![How to remove sleeve anchors (expansion bolts/dynabolts) [bolting for climbing]](/img/n.gif)
With the smaller dynabolts I have found if you can push the bolt in a few mm then you may be able to get a pair of needle-nose pliers onto the _split expansion sleeve_ then you have a chance of being able to pull the outer sheath up into the hole. This then allows the flair / flare on the _split expansion sleeve_ end to fit back through the hole and be extracted. The advantage if you can use this method is the dynabolt can be reused since you will have all parts of the fastener removed from the hole. I have been successful doing this about 75% of the time using up to M8 sizes. I haven't needed to use larger sizes so don't know of this will work on M10 and up because they have a thicker metal on the split expansion sleeve so it may not "unflair" itself enough to pull bac through the hole.
*Thank You* for the video. It is always good to have another method to use if your goto one doesn't. Much appreciated. 👍👍
Excellent. Exactly the information I needed.
Dumb question….however, I have a 1/2” anchor that I am assuming is 3-4 inches in the concrete….what size core bit do I need?
Hahaha. I've lost count of the number of times that I've tripped over redundant anchor bolts. I usually just cut the buggers flush immediately the piece of kit is removed. There must be some scientific law that states that when being lowered down ,say, a drainage shaft, you will bounce off of every anchor stub that some lazy arse has left in place when removin an old access ladder or whatever. If there is one anchor stud in a room 30 metres by 30 metres, you will kick it the first time you enter that room!
I’ve noticed quite a lot of these on site myself, it amazes me! I knew a guy that tripped over one, and was injured and put a compensation claim in ( To be honest I think he saw it and deliberately fell over it )
Thanks for the comment 👍
I’ve broken the studs flush with the floor by striking them laterally from two opposite directions with a hammer until the snap off.
Done that aswell
@@ryanh3285 Now that I own an angle grinder I think these methods would be easier.
Thanks, I am going to have to get one of those diamond bits. I have several anchors in the wall in the laundry from an old tumble dryer!
They are really useful for jobs like this 👍
Thanks for the video. I removed an old railing to have it powder coated, and plan to place it back in the same spot. Unfortunately all of the concrete anchors snapped off when loosening due to rust. Can I remove them with a core bit and replace with new anchors in the same spot? Do I need to fill the holes with anything before replacing the anchor in the same spot? Thanks in advance for your advice. I don’t really have room on the stair to move the anchor spots.
I would remove the old fixings using the core drill bit, as per the video, then I’d clean out the holes using a vacuum cleaner/brush etc.
You could refill the holes using concrete, then redrill the holes, or perhaps a better option would be to use resin fixings and studs, example of resin fixings here- czcams.com/video/oUJPjJsdl0c/video.html&t
Good tips. THANKS
I’m glad you found the video useful
Thanks for the comment 👍
Lost count of the amount of times I've kicked one of these rusty old anchors. Angle grinder problem solved.👍👍
👍
Random Question. Did you appear in the Robot Wars episode of Phoenix Nights?
Not to my knowledge. Perhaps they found a geeky looking dork that looked like me 😂
I see you have that Wera ratchet/hammer thing. How do you rate it?
It’s ok for some jobs, but as a maintenance engineer it’s use is very limited due to the size of the ratchet head 👍
@@ultimatehandyman Aye, it looks a bit clumsy. Thanks for the reply👍🏼
Good vid , I think I'd choose the cut and punch method .
Yeah, it depends where you are. I sometimes subcontract in chemical plants, you would need a hot work permit to use a grinder in all areas (not just explosive atmospheres), but the drill can be used in non-explosive areas without a hot work permit 👍
Thanks for the comment 👍
You have those T shirts available as merch?
No, sorry. I have tried a few online retailers that do merch (where you can have a CZcams store etc.), but I have always done a trial purchase first, and the quality has not been good. I don’t want my subscribers buying inferior goods, so I have never bothered opening up a merch shop 👍
What would you fill the hole with after removing the anchor?
I’d fill the hole with either mortar, or granolithic mortar, I often inject it in using this method- czcams.com/video/OjVBBOIEMH0/video.html&pp
How I mix larger batches of concrete is here- czcams.com/video/xLaP0N8BcTQ/video.html
I have used an oscillating hand tool to cut off the exposed anchor with good success.
👍
What's wrong with countering the nut with another nut and then using it to turn the bolt out?
They expand when you pull them up 👍
@@ultimatehandyman yess but the screw screws Out. How i remember ist the Expander Plug and the Holding sleeve are seperate parts
I think you are talking about expansion bolts, not concrete anchors-
czcams.com/video/hJg0xVb3eAg/video.html&t
I had never seen core drill method great if you need removal for any reason 👍🏻
Thanks for the comment 👍
Good Morning Ultimate Handyman
Enjoy your Sunday
👍
CANNY Ultimate Handyman
From Nick Ayivor from London England UK 🇬🇧 ⏰️ 08:29am
Thanks Nick, best wishes from sunny Darwen 👍
👍👍👍Thank you
You are welcome
Thanks for the comment 👍
🤘😎🤘
Nooice!
Cut off with cutting disc ,???????
Have you ever used trip advisor?
I have. See... my big toe? Ouch!
Just being daft....as per.......
😂😂😂
Why don't you just cut it flush to the concrete with a grinder?
You can, but if you need to reposition a concrete anchor slightly, you need to remove the old one 👍
Okay that makes sense! Thank you sir
I just cut those dynabolts
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Footprints 👣👣 WD40 and brute strength 💪💪💪💪🍺🍺🍺
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buddy... when you're cutting metal, never NEVER EVER use a wafer blade on you angle grinder. This is how 99% of awful accidents happen with these things. You MUST use a diamond coated CARBON STEEL blade. It IS more expensive, but significantly less likely to shatter.
Thanks for the concern. In my 30 years of work, I have never had a disc shatter 😉
For several years, I used an angle grinder every day with 1mm thick cutting discs and never had any problems!
Thanks for the comment 👍
@@ultimatehandyman I've never had one shatter either in 30 yrs, altho I did have one separate from the center piece.
You may have a feeling for it by now, but please NEVER suggest trainees or DIYers to use this. Reddit is iterally filled with thousand of images of mangled faces, hands, and arms as a direct result of these wafer blades
That is not a direct result of people using “wafer” blades, it’s because people don’t know how to use a grinder correctly. I covered much of this years ago, in this video- czcams.com/video/1TFisMcDrH4/video.html 👍
@ultimatehandyman Don't you know that 97% of all angle grinder accidents occur while operating an angle grinder! How can you show angle grinder usage like this!? I criticize people to feel better about myself! Rar!