Anchor mass - too big hole

[RobbanLT]

Hi! I've been searching like crazy but really haven't found an answer. So I'm hoping for knowledgeable people here.

I have a drill hole in a really large rock, the hole is about 40mm and 30 cm deep. I want to attach an eyelet in this to secure a trailer with a chain. I’m aware of how easy it is to cut/saw/clip the parts, but right now I’m just interested in preventing the "opportunistic thief."

Anyway, I have a tube with about 300ml of anchor compound. It won’t be enough for the hole, can I fill the hole with e.g. insulation/styrofoam/small stones to save some of the compound so it's not as deep?

The eyelet to be secured has a leg that's about 10 cm long and M12 dimension.

Disregarding usage, is it possible to secure it anyway? Or does it become weakened when there's so much space?

Thanks in advance!

 

[Höghus]

No idea if it works to fill underneath but to reduce the gap you can fill the threaded part with nuts. It's probably 19mm key on M12 so then you're halfway there at least.

/Höghus

 

[Dilato]

No idea if it's possible to fill underneath, but to reduce the gap, you can fill the threaded part with nuts. It's probably a 19mm key on M12, so you're halfway there anyway.

/Höghus

If you just want to make the hole less deep so you don't have to fill the unused part with anchor mass, you can stick a suitably long and thick "something" in the bottom of the hole.

Some crumpled newspaper pressed down into the hole with the bolt makes it land at the right depth and it's tight enough so the mass doesn't flow down further.

 

[BSOD]

15cm of fine concrete at the bottom and the problem is solved, right?

 

[Jochi]

Hi! I've been searching like crazy but haven't found an answer. So I'm hoping for knowledgeable people here.

I have a drilled hole in a really large rock, the hole is about 40mm and 30cm deep. In this, I want to attach a loop to be able to lock a trailer with a chain. I'm aware of how easy it is to cut/saw/clip the parts, but right now I'm just interested in deterring "the spontaneous thief."

Anyway, I have a tube with about 300ml of anchor mass. It won't be enough for the hole, can I fill the hole with, for example, insulation/styrofoam/small stones to save some mass so it doesn't end up as deep?

The loop to be fastened has a leg that is about 10cm long and M12 dimension.

If we disregard the amount needed, is it still possible to attach it? Or will it be weakened with so much space?

Thanks in advance!

The hole must be clean for the mass to bond well. A special bottle brush is recommended. The weakness of the fastening mass lies in how well it adheres to the rock. Therefore, it's good if the hole is as large as the bolt because a large hole has a bigger surface area than a small one. I experienced this when it came to fastening a flagpole in rock. Fastening mass at Biltema is not very expensive, but for your purpose, it doesn't really need to bear that much load.