Your Tripel shouldn't really be fermenting anymore if you're at 1.02, or it should be very nearly done. The point of it being in the secondary is more to help clear the beer and condition it, letting the yeast clean up some of its byproducts. A lot of people around here don't move to secondary, instead just opting for a 3-4 week primary fermentation. Since it's in the secondary now though, I would give it 2-3 weeks or more before bottling.
As far as carbonation in the bottle goes, unless you leave your beer in the fermenting vessel for several months, there should be enough yeast in suspension to properly carbonate/bottle condition. I've bottled an ale that was in the primary for over 6 weeks and did not add fresh yeast, it carbonated just fine.
Hope this helps, and welcome to the hobby!