6-NORTH RUN AROUND #13 BLOCK-INJURED AND CO WORKER WERE INSTALLING A CANOPY ON A UNI-TRAC. THE CANOPY WAS SETTING ON A 6"" CHANNEL PLACED ACROSS THE TOP OF THE DECK AND SUPPORTED BY 2 COME A LO NGS. AS THEY WERE TRYING TO POSITION CANOPY LEGSOVER SOCKETS THE CANOPY SLIPPED AND CAUGHT EE LEFT HAND BETWEEN CANOPY LEG AND DECK OF UNI-TRAC.