I used ox-taskjuggler 2 years ago I think, but I remember having to fix some time translation calculation in order to make it work correctly.
I have this ox file on my computer and if you are interested I can share it or at least try to run it on my machine if you give me few days. Taskjuggler is an amazing piece of software, and using it with org-mode is really a great combination! Best regards, -- Antonio Carlos PADOAN JUNIOR Phone: +33(0)6 5035 1196 GPG fingerprint: 243F 237F 2DD3 4DCA 4EA3 1341 2481 90F9 B421 A6C9