Heavy-duty anchors do not work

Hello. I want to hang a mirror from the ceiling with chains. The mirror weighs about 20-30 kg. I bought 2 heavy-duty anchors for this.

So I drilled an 8mm hole overhead into the ceiling. The concrete is quite porous, so I could drill through it practically like butter. I then bought a composite material to inject, which I injected into the hole. After that, I put in the anchor and then hammered it in properly. Here comes the first problem. Due to the pressure, the nut almost completely disappeared into the plaster layer. I don’t know if the anchor expanded; in any case, it is freely rotatable but holds the mirror on its own.

I didn’t want to leave it like that because I am afraid that the whole thing might eventually fall from the ceiling, so I repeated the procedure with a second anchor. Again, the problem with the plaster occurred... I put a second nut between the wall and the nut so that the anchor has a contact surface and I can still maintain the depth of > 45mm. The nut disappeared completely into the plaster and hammering only caused more plaster to crumble off, but it didn’t help and I could easily pull the anchor out of the wall with some force. It simply did not expand.

I definitely want to have a second hook in the ceiling so that the mirror is not held by just one screw. Why didn’t it work? And what can I do now?

Thanks and best regards

Hello,

please make sure to get help from a professional. If a 30 kg heavy mirror falls from the ceiling onto your head, you probably will not survive it!!!!

With heavy-duty anchors, it must also be noted that they must be approved for the concrete tension zone. However, if you describe that the concrete drilled like "butter," then that was not concrete (maybe plaster) or at least not proper.

Best regards