11/13/2015 1 FY12 Special Project ST09-1884 Replace 24-inch Underwater Waterline Pearl City Peninsula to Ford Island Presented by: Greg Hayashi, NAVFAC Hawaii UEM Water – Owner Jon Muraoka, Fukunaga & Associates, Inc. – Designer Art Lambert, Healy Tibbitts Builders, Inc. – Contractor Presentation Outline • Owner’s Perspective NAVFAC Hawaii Water Utilities – Greg Hayashi • Design Considerations Fukunaga & Associates, Inc. – Jon Muraoka • Construction Challenges Healy Tibbitts Builders, Inc. – Art Lambert
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11/13/2015
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FY12 Special Project ST09-1884Replace 24-inch Underwater Waterline
Pearl City Peninsula to Ford Island
Presented by:Greg Hayashi, NAVFAC Hawaii UEM Water – Owner
Jon Muraoka, Fukunaga & Associates, Inc. – Designer Art Lambert, Healy Tibbitts Builders, Inc. – Contractor
Presentation Outline• Owner’s Perspective
NAVFAC Hawaii Water Utilities – Greg Hayashi
• Design ConsiderationsFukunaga & Associates, Inc. – Jon Muraoka
• Construction ChallengesHealy Tibbitts Builders, Inc. – Art Lambert
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Project Objective• Replace existing deteriorated 24-inch cast iron
submarine waterline under the Pearl Harbor North Channel
• The new waterline will provide reliable potable and fire protection water for Ford Island, Pearl Harbor Shipyard and Joint Base Pearl Harbor Hickam
Butt fusion welded pipe string allowed continuous HDD pulling installation; avoiding collapse of bore hole and binding of the pipeline. The continuous 3,500 foot long pipe string was pulled through the under-channel bore hole in one day
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Project Summary• Replaced 4,300 LF of deteriorated 24-inch cast iron pipe
• HDD installation of 3,500 LF with 24-inch Fusible PVC
• Conventional installation of 800 LF with 24-inch DIP
• Fusible pipe staging at Ford Island – use of Ford Island runway
• Noise abatement while driving casing/drilling at Pearl City Peninsula
• HDD Pilot Hole acceptance - trapped air issue• Pull forward/pull back the day of pullback to situate pipe
for pullback into directional drilled hole
Horizontal Directional Drilled (HDD) Section of Pipe:
• Exceeding bending radius’ – horizontal & vertical – of 24” diameter fusible pvc pipe during pull back
• Traffic control plan on Ford Island the day of pull back –September 23rd, 2014
• Water ballasting of fusible PVC pipe during pullback to achieve neutral buoyancy
• Disposal of drill spoils in “real time” in “Frac Tanks” and to PVT Landfill
• Cleaning/disinfecting HDD section of the new pipeline
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Epoxy Coated Ductile Iron Sections of Pipe:
• Ground water control – Ford Island• Ground water control – Pearl City Peninsula• Epoxy coating quality control/thickness• Thrust for restraints for large diameter pressure line –
“massive” thrust blocks and supports• Vaults – pros and cons to Pre casting vs Site casting• Sheet pile cofferdams – 8 each. Biggest Challenge:
working around overhead utilities at Pearl City Peninsula• Unforeseen obstructions