us army corps of engineers building strong ® ft leonard wood area office ft leonard wood area...
TRANSCRIPT
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US Army Corps of Engineers
BUILDING STRONG®
Ft Leonard Wood Area OfficeWater Tower Lift
18 September 2015Dale Bleckman
Resident EngineerNorth Resident Office
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2 BUILDING STRONG®
AgendaThe Water Tower Extension
• What happened• Options Considered• The Lift• Architect-Engineer Liability• Questions
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3 BUILDING STRONG®
What Happened• 500,000 gallon water tower near vet clinic finished in
late 2014
• After completion it was determined that water pressure was about 14 psi too low.
• Research indicated that the tower was designed 33.8 feet low
• Error was due to surveyor software glitch
• Architect-Engineer accepted responsibility for the design error
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4 BUILDING STRONG®
Options Considered• Use pump
Additional maintenance Additional cost
• Raise the tower 33.8 feet Use a jacking system Use cranes
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5 BUILDING STRONG®
The Lift• Water Tower weighed approx 225,000 pounds
• Three cranes used (550 ton, 450 ton, 210 ton) and 150’ man lift
• 13 tractor trailers required to move one of the big cranes – over 500,000 pounds of counterweights
• New 33.8 foot, 53,000 pound section added to extend tower from 122’ to 156’
• Prep for lift started at 0530 hrs, 18 Sep 2015; tank was standing on its own by 1730 hrs same day
• Weather was one of the main controlling factor
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6 BUILDING STRONG®
THE LIFT
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7 BUILDING STRONG®
Architect Engineer Liability
• Design error was due to software glitch with surveyor’s program
• Designer accepted responsibility and re-designed tower
• Designer is responsible for re-construction cost but is not responsible for the additional 33.8 foot section
• Re-construction costs paid from project $s; AE Liability $s, if any, will go to US Treasury
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8 BUILDING STRONG®
Questions