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I am planning to make a concrete base on top of a soil which is 600mm x 350mm x 100mm deep. Beside the area is a concrete pathway and concrete driveway.
I have dug a whole as specified by the instructions asked.
Is it safe to drill on the concrete and attach a rebar?
Hello @cgab
Thanks for sharing your question about your letterbox. If you are drilling from the side, my best advice is to make sure that you are not too close to the surface, otherwise the concrete surface will crack. This is on the condition that your concrete path/driveway is at least 100mm thick. If attaching the Rio bar to the existing concrete path/driveway is included in the instructions, then it is something you'll need to do.
If you need further assistance, please let us know.
Eric
Hi @cgab,
So you are you concerned (and want to mitigate the possibility) that the whole thing - mailbox and slab - could topple over in high gusty winds yes?
Don't bother with the.Rio.
Google image search reports that is a Milkcan Noosa and the mailbox is secured to the slab with expansion bolt.
For peace of mind you can do the same to secure the slab to mother earth with threaded rods.
When preparing the trench for concrete boar two auger holes using something like this.
Cut this in half.
Also need nuts for that.
Wind the nuts on flush with the rod ends.
Hammer the rods into the auger holes so they will be about flush with the concrete slab.
Do the concrete thing making sure to poke/prod the concrete to compact and eliminate voids, in particular the auger holes.
If needed tap the rods below the surface of the concrete when trowling.
Cheers
