THE EE WAS HANGING 6"" SCHEDULE 80 PASTE PLANT PIPE. HE TREID TO MOVE THE PIPE IN THE PIPE TRUCK CRADLE BECAUSE IT WAS OVER LAPPING THE PIPE THAT WAS INSTALLED HE GOT OFF THE WORK PLATFORM ON T HE TRUCK AND THE SECTION OF PIPE ROLLED OFF THE PIPE TRUCK AND STRUCK HIS LEG AND ANKLE. HE WAS UNABLE TO RETURN TO WORK ON HIS NEXT SHIFT BECAUSE OF SWELLING IN HIS ANKLE.