INJURED WAS BUILDING CRIBS. THEY HAD LOADED A SCOOP WITH CRIB BLOCKS AND WAS TAKING THEM TO WORK AREA. THE INJURED WAS AT WORK AREA WHEN SCOOP GOT CLOS. HE STARTED TO MOVE. HE TRIPPED AND FELL . SCOOP OPERATOR DID NOT SEE HIM FALL AND WAS LOOKING FOR A SIGNAL TO STOP. SCOOP BUMPED STANDING CRIB AND KNICKED CRIB ON INJURED.