JET BLAST WHEN B727-200 TURNS AROUND AND ADDS PWR FOR TKOF NEAR CONSTRUCTION BARRICADED END OF RWY CAUSING JET BLAST TO WORKMEN AND EQUIP ON SIDES OF RWY BEHIND BARRICADES. FLC BELIEVED THAT THEY HAD USED MINIMUM PWR WHEN TURNING AROUND FOR TKOF SUBSEQUENT PWR UP FOR TKOF 500 FT BEYOND THE DISPLACED THRESHOLD.

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ACFT CLRED TO TAXI TO RWY 4 LAST 1950 FT CLOSED/UNDER CONSTRUCTION; ENRTE TAXI CLRNC. CHANGED TO RWY 22 WITH A NEW ATIS BEING TAPED. RECEIVED UPDATED ATIS INFO VIA GND CTL AND THEN CLRED TO BACK TAXI AND TKOF RWY 22 BY ROC TWR. TAXIED BY DISPLACED THRESHOLD TO END OF RWY WHERE BARRICADES MARKED THE CONSTRUCTION SITE. MEN AND EQUIP GROUPED BEHIND BARRICADES BUT DISPLACED 50 FT EITHER SIDE OF THE RWY CTRLINE. MADE 180 DEGS BACK TO CTRLINE AND CAPT ADDED PWR TO START SPOOLING ENGS. WHEN ACFT WAS BEYOND DISPLACED THRESHOLD THROTTLES WERE ADVANCED TOWARD TKOF PWR. ROC TWR CALLED IMMEDIATELY AND SAID ACR X YOU JUST ADDED TKOF PWR TOO SOON AND BLASTED THE MEN AND EQUIP. NO GREATER THAN BREAK-AWAY THRUST WAS USED PRIOR TO THE DISPLACED THRESHOLD AND TKOF PWR WASN'T ACHIEVED UNTIL 500+ FT BEYOND DISPLACED THRESHOLD. RECOMMEND DISPLACED THRESHOLD BE MOVED TO PROTECT MEN AND EQUIP. RECOMMEND ATC DIRECT IDLE PWR ONLY; UNTIL ACFT PAST DISPLACED THRESHOLD. RECOMMEND ATC DOESN'T CRITIQUE COCKPIT CREW DURING TKOF ROLL.