TWIN HEADGATE REPLACEMENT FOR SIX  EXISTING WOODEN TIMBER HEADGATE

NEW ELEVATED PLATFORM WITH 4 DRAGRAKES AND AUTOMATIC SLUICING TROUGH

99 ISLANDS WAS ORIGINALLY CONSTRUCTED IN 1911. EACH UNIT HAS A 16'8" WIDE X 20' TALL WOODEN TIMBER HEADGATE FOR DEWATERING THE TURBINE. THE EXISTING OPERATING MECHANISMS CONSISTED OF A SERIES OF JACK-SHAFTS, CAST IRON GEAR REDUCTION, AND RACK AND PINION LIFTING BEAMS. 

DUKE POWER CONTRACTED WITH NORTH FORK ELECTRIC INC. TO DESIGN AND BUILD A UNIQUE SELF-SUPPORTING TWIN HEADGATE REPLACEMENT.  AFTER THE FIRST HEADGATE INSTALLATION IN LATE 2004 dUKE CONTRACTED WITH NORTH FORK ELECTRIC INC. TO SUPPLY 5 ADDITIONAL REPLACEMENT GATES, 4 DRAGRAKE SYSTEMS, AND AUTOMATIC SLUICING TROUGH.

THE REPLACEMENT DESIGN IS OF MODULAR DESIGN FOR EASE OF SHIPPING AND ASSEMBLY. ALL STEEL IS FULLY HOT DIPPED GALVANIZED AND EACH GATE HAS CONTINUOUS RUBBER "J" SEALS . EACH GATE HAS A 50 TON RATED SCREW-JACK AND IS CAPABLE OF CLOSING UNDER FULL DIFFERENTIAL.

#2 HEADGATE INSTALLATION

HEADGATE SCREW-JACK ASSEMBLY

DRAGRAKE ASSEMBLY

TROUGH GATE AIR CYLINDER

TRANSITION PLATES

IN/OUT FLOATS

IN/OUT FLOATS

FRAME CLAMP BARS

NEW TRASHRACK

FRAME INSTALLATION

FRAME ASSEMBLY

DOWN STREAM VIEW

RIVER GATE WITH PNEUMATIC EQUALIZING GATE

SEE FABRICATION DETAILS

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