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Old 07-02-2016, 08:56 PM   #1
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Removing hammer set concrete anchors


I need to remove a sprinkler timer mounted on an exterior concrete wall.

For some reason, the last owner mounted the plastic timer box onto the concrete wall with four hammer set concrete anchors.





How would you remove these? I can't think of a way to do it without using a pry bar and that would end up tearing up the plastic box as well.

Unless I can somehow fit sawzall with a flat metal blade behind the box and cut the anchor off flushed. Which is possible.

Is there another way to remove the box without damaging it and not leaving any part of the metal anchors inside the wall?

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Old 07-02-2016, 09:29 PM   #2
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Re: Removing hammer set concrete anchors


Grind the head off. A small die grinder or dremel tool should fit in without damage to the box.

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Old 07-02-2016, 10:40 PM   #3
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Re: Removing hammer set concrete anchors


Agreed with the grinder/dremel but I might try to drill the centre part out to minimize the amount of dremel work.
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Old 07-02-2016, 11:34 PM   #4
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Re: Removing hammer set concrete anchors


Unless you are saving that sprinkler box to send to the museum, I'd me using some brute force to remove it and then just cut off what is left...then use a punch to push the remaining stud into the wall...then patch
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Old 07-03-2016, 07:33 AM   #5
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Re: Removing hammer set concrete anchors


I would agree with the drill option. I didn't think of it at the time. A center punch to set it in the pin and then drill away.
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Old 07-03-2016, 09:46 AM   #6
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Re: Removing hammer set concrete anchors


Drill it was my first idea.

These are just a different kind of rivet. And rivets are best drilled out.

Center punch first to give yourself a stable starting point.


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