Animation problems

Hello ,i have problem with animating a battle-mech-titan.
i don’t know how to make floor for bones ,as normal constraints doesn’t work.I have it fully rigged and skinned. Also if anyone would tell some simple way of dealing with this ,as my meshesh don’t cooperate with my floor too much,because they seem to stop at ridiculous moments and positions regardless of my bone positions.:spin:

Help please.

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