INJURED WAS OPERATING A MOTOR PULLING DOUBLE DOLLYS OUTSIDE. APPROX. 1 BREAK OUTBY THE 3 HLG SWITCH THE DOLLYS HIT A WATERLINE COUPLING CAUSING THE WATERLINE TO BUCKEL UP IN FRONT OF THE MOTOR ON THE OUTBY END. THE PIPE CAME UP ACCROSS THE POLE AND BASE STRIKING THE INJURED INT HE HEAD AND SHOULDER.