Hi:
Just to be sure I'm understanding the situation correctly:
1. Your clutch pedal is on the floor.
2. Your clutch is effectively fully engaged, disconnecting the engine from the transmission, driveshaft, etc.
3. The car will roll freely.
It sems odd that all three forks would stick simultaneously... despite the fact that all the pressure plate springs (tough little dudes to be sure) are trying to restore the forks to their normal position. Check the bolts that mount the pressure plate assembly to the flywheel.
When you say "the clutch pedal went to the floor" do you mean that the pedal just fell to the floor of its own volition, or that it just stayed there when you removed your foot? Were there any snapping, banging, etc. sounds? Did the pedal go down with hardly any effort? Also check the (my name) "motion transfer bracket" that is anchored to the frame (on one side), and the engine (on the other). This is the device that pivots by means of a ball swivel and transfers the downward motion of the pedal to the horizontal motion required to actuate the clutch. If the engine mounts are bad, (allowing the engine to move around too much) it can pop out. Pedal action will be disrupted, and you can loose the mating half-swivels that mount in the bracket itself. (On the fly I can't find the proper names in the books.) Hopefully, you did not mess with the overcentre spring.
On first take, and assuming no linkage re-assembly errors, it would seem to me that your pressure plate assembly is, at the worst, kaput. Was the pressure plate assembly correctly re-assembled from a take-apart? The "all three at once" is a bit of a puzzlement.
I suspect you will have to remove and replace the pressure plate assembly. BE CAREFUL! since we aren't really sure of what is going on here yet, it is prudent to assume that the a fore mentioned pressure plate springs could/would cause the whole thing to fly apart violently. Since I have never tried to remove the flywheel and pressure plate as a unit, I don't know if there is enough clearance to do so (I suspect not). If possible however, that would be the safest approach. Otherwise, remove the pressure plate cautiously, wear eye protection, you know, the usual stuff.
Hope this helps.