EMPLOYEE WAS TAKING GRATING OFF THE TOP OF PUG MILL #2; GRATING CAUGHT HIS GLOVE, PULLING HIS RIGHT SHOULDER AND CAUSING SHARP PAIN. HE WAS JACKHAMMERING CEMENT ALGERS AND HIS ARM GOT CAUGHT BETWEEN BOX AND SPRAYBARS WITH JACKHAMMER RUNNING; JACKHAMMER TWISTED RIGHT HAND AND HIT RIGHT ELBOW ON BOX.