attaching gate to concrete post?

i have a park next door and would like to put a gate in so my kids can access it.
Just wondering how to attach a gate to a concrete post?
Have thought of drilling 3 holes through it and using coach bolts to attach a redgum post to it, and hang the gate off that.
I can't put in anouther post as i i only have a small gap between the house and planter box's to work with.

Dynabolts?

If it's one of those pre-cast conc posts with a bit of reo rod down the middle, (like a house stump) be very, very careful when drilling... hitting the rod with the bit, esp. in hammer mode, can result in a need to replace the post.

IMHO it's better to avoid drilling at all, if possible, 'cos chunks can break away even if you don't hit the rod. :rolleyes:

I'd be more inclined to see about sourcing (or making) some "squared off" U-brackets from steel strapping to wrap around the outside of the post instead and welding the hinges directly to these brackets...