rehabilitation of chester water - pennsylvania section · rehabilitation of chester water...
TRANSCRIPT
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Rehabilitation of Chester Water
Authority’s Pine Grove Dam
Tainter Gates
Brian P. MacEwen, P.E.
Director of Engineering
Chester Water Authority
April 24, 2013
PA AWWA Annual Conference
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Pine Grove Dam
650 ft. long, 65 ft. high at maximum
138 sq. mile watershed
Storage: 2.2 billion gallons
Uncontrolled ogee spillway 71.5 ft. long
Two 44 ft. wide by 30 ft high Tainter Gates
Gate Crest Elevation: 280 ft
Gate Sill Elevation: 250 ft
Low-Head Hydropower Facility (520 kw)
FERC Regulated Dam
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Tainter Gate Section
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Folsom Dam, California
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U.S. Bureau of Reclamation
1955
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Imagine you’re the
person who went to
open up a Tainter Gate
on Monday morning,
July 17, 1995 …
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• Sustained Release of
25,800 MGD
• Drained 40% of reservoir
until flow stopped
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Folsom Dam, California
Forensic Analysis
Diagonal brace joint next to trunnion was the initial
point of failure
Friction in the trunnion was not considered in the
design
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Trunnion
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FERC Response to Folsom Dam
FERC required ALL dams with tainter gates to
analyze whether friction was accounted for in
the design of the gate structure
Conduct a full gate opening every 5 or 10 years,
depending on category of dam
Conduct a close-up, detailed inspection every 10
years
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Project Team & Schedule
Consultant - Gannett Fleming Structural Analysis and Design in response to FERC directive
Preparation of the Bid Document
Services during Construction
Bid Project - March 2005 Crofton Diving Corporation, Newport News, VA
Construction Phase: Field work started Fall 2005
Fabrication of Bulkhead and Abutment Plates – 2006/07
Gate 1 – 2008 and Gate 2 - 2009
Stored Bulkhead in Summer of 2010
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Challenges at Pine Grove Dam
No stop-log or bulkhead arrangement in original
construction that would allow for inspection of
the gates in a dewatered condition
Reservoir and water supply intake had to stay in
operation 24/7
Plant personnel had to be very nimble with
flood events while one gate was out of service
No winter work
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How?
Customized Floating Bulkhead
6 caissons – 25” thick by 58” high by 44’ wide
Valves for flooding caisson with water and pumping
air for flotation
Abutment Plates – 304 SS
10” wide face for bulkhead seating
59 anchor bolts for each abutment
Installation with cofferdam
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Anchor Bolts
Abutment Plates – 59 anchor bolts each side
1.25” and 1.50” diameter bolts with 11” to 16”
embedment
Loaded to 25,600 lbs
Tested 25% of anchor bolts after installation
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Barge
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Abutment Plates
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Bulkhead
• Delivery to Site
• Installation - Rigid
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Repairs
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Full Height Lift
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Bulkhead Removal
Process
• Roll-up Garage Door
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Caisson Storage
• Location: Fishing HQ
• Power washed & touch-up paint
• Treated seals to prevent dry-rot
• Purge chambers with nitrogen
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Final Project Costs
Engineering - $ 150,000
Construction - $1,728,000
Thanks to:
Treatment Plant Staff
Gannett Fleming – Richard Horvath, P.E.
Crofton Diving Corporation
Jay Crofton & Kurt Feairheller
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QUESTIONS?