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If MrDrem wants to do a home-made ground anchor, we would actually suggest it is not a good idea to concrete-in a bit of chain as the link that emerges from the concrete is very vulnerable to attack with hammers etc, as it is very solidly supported and not flipping and flopping around. If it is attacked and damaged/broken, you end up with a lump of concrete and a worthless bit of chain coming out of it with no easy way of fixing it unless you like using a Kango rather a lot ;-)
We suggest a better home made idea is to either get an offcut of 4" underground PVC drain piping and ideally 2 bends to suit, to contrive a big 'U' shaped tube that you would then embed in the concrete, optionally with some rebar sitting within the 'U' and the whole caboodle embedded in the concrete. That 4" pipe will be big enough to take any of the big chains and potentially more than one of them (depending).
Another similar idea is to use a short length of 4" land drain pipe (also available from builders' merchants) and to use a piece of string to hold that in a 'U', and some duct tape or cling film to bung up the holes (as it's porous piping), before embedding that in concrete as above.
Note that the big eyes used for lifting and fixing things are invariably not big enough to take a decent chain. We get that quite frequently, where someone has made an anchor with one of those as the locking point, and then discovered how bulky the decent chains are. You can solve that by using something like a mini-D-lock to go through the eye and the end of the chain, but that combination can itself make the D-lock vulnerable to twisting attacks against the eye. Better, in our opinion, to either do one of the embeded drain pipe ideas above, or to use something with sufficient capacity to take a proper chain ...such as a decent ground anchor :-)
The other thing to be wary about with home made solutions is that they may not satisfy the insurance requirements. Some cycle policies just require an "immovable object" (read the small print), where something like the drain pipe or other idea may do the job, but if they demand something with Sold Secure Bicycle Gold etc approval, there is little option but to go for a commercial product with the right piece of paper. That is exactly why we pay out initially with each new product and on the annual audits again, so that the piece of paper is available for those that need it.
I hope that helps,
Steve ...a 'he' :-)
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Pragma
Not trying to do Pragma, who has shown him/herself to be positive member of the Forum, out of a sale,
but,
if you are laying your own concrete, are you incorporating any rebar, (reinforcing steel rod)?
If yes, you could easily thread the rebar through some large dimension chain, (which would emerge from your concrete floor), to give you a flexible anchor point.
I have also pondered those large steel eyebolts that are used to secure scaffolding to buildings.