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Gilmerton Vertical Lift BridgeA Presentation to The AASHTO Technical Subcommittee for Movable BridgesBy: Kevin Johns, PE | Movable Bridge Business Unit DirectorJune 27, 2016
Design and Construction of the
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Acknowledgments
Owner:Administrator Lift Span EOR: Approach Span EOR:Contractor:CEI:
City of ChesapeakeVDOTModjeski and MastersGannett FlemingPCLParsons Brinckerhoff & Hardesty and Hanover
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Project Location
• Located on Rte. 13 Military Highway
• Crosses the Southern Branch of the Elizabeth River
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Project Site
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Gilmerton Vertical Lift Bridge
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6
Structural Statistics
• Dimensions:– New bridge length: 1,908 ft– Lift Span length: 250 ft– Towers: 207 ft tall– Vert. Clear: Open 135 ft,
Closed 35 ft clearance– Hor. Clear: 150 ft Min– Six Lane Cross Section. 85’-
4” out-to-out of Deck– Trusses 89 ft CL-to-CL
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Structural Statistics
7
• Weights:– 7.1 Million Pounds
Structural Steel– Lift Span Weight: 5 Million
Pounds– Reaction at Tower Base:
4.4 Million Pounds/Tower Leg
– Counterweight pockets sized to accommodate FWS
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Electrical System• Drive Motor: 2 - 200hp
Flux Vector Drive per tower
• 30hp auxiliary drive gearmotor in each tower for emergency operation
• CCTV monitoring the roadway and waterway & marine radar monitoring of the waterway
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Mechanical Statistics• 2 ¼ in Dia. Ropes• Sheaves: 15 ft Dia., 12 Ropes
each, 4 per Tower• Transverse centering through
guide rollers• One main differential gear
reducer driving • Two secondary differential
gear reducers• Driving two drive pinions
each• Engaging Four Ring
Gears on Sheaves
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Problem/Solution
• Problem: Build new bridge on same alignment with minimal disruption
• Solution: Straddle it.
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Construction Over Existing Bridge • Existing bridge
carries vehicular traffic
• Able to open for marine traffic
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Problem/Solution
• Problem: Build a new bridge 20ft from active RR Bridge
• Solution: Instrument it.
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Problem/Solution
• Problem: Support 15Million pounds of reaction in the Great Dismal Swamp
• Solution: 12ftdiameter drilled shafts
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12ft Diameter Drilled Shafts
• 12 ft Dia Drilled Shaft Oscillator
• Shafts founded in soil,not rock
• #18 Longitudinal Bars• #8 Hoop Bars
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Installation Challenges
• Picking casing for 12ft drilled shaft from under the railroad bridge
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Problem/Solution
• Problem: Settlement of shafts founded in soil
• Solution: Jacking brackets
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Jacking Brackets
• Ability to correct for settlement at any column bearing
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Problem/Solution
• Problem: Drilled shaft installation procedure inconsistent with design
• Solution: Redesign during construction
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Drilled Shaft Redesign
• Original Design• 183ft long full
depth casing difficult to install
• Installed Design• Redesign with
123ft shaft with 78ft of casing
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Problem/Solution
• Problem: Support the truss with top of foundation 25ft below truss bearings
• Solution: Integrated shelf on tower column
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Lift Span Support Shelf
• Shelf on tower leg to support lift span– Reaction for live load– Reaction for
counterweight supported
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Problem/Solution
• Problem: Bottom bay of bracing interferes with existing roadway
• Solution: Moment connection in tower and bearing
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Moment Resisting Connections
• Transverse Floorbeams Fixed End Connection to Tower Legs
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Moment Resisting Connections
• Anchor Bolts Post-Tensioned for Fixed Connection to Drilled Shaft. 180,000 pounds per anchor bolt
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Problem/Solution
• Problem: Protect bridge from large ocean vessel collision
• Solution: 7 – Dolphins and a new fender system
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Vessel Collision Potential
Barge Approaching Barge Positioned to Pass
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Dolphins
• Dolphin Installation– Dolphins range from 35ft to
45ft diameter– Sheet Pile ring with H-Pile
king posts attached– Tip elevations from -86.0 to
-116.0
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Problem/Solution
• Problem: Ordnance found in Bascule Counterweight
• Solution: Call the Navy
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Construction
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Construction Photos July, 2010
Existing Bascules Work Trestle
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Construction Photos Oct., 2010
Drilled Shaft Oscillator Drilled Shaft Oscillator
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Construction Photos Oct., 2011
Traffic Under Tower New Tower w/ Bascule Up
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Construction Photos Dec., 2011
New Tower Aerial View
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Construction Photos Dec., 2011
Aerial View at Site Aerial View Lift Span
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Construction Photos Jan., 2012
Aerial View at Site Aerial View at Site
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Construction Photos May, 2012
Aerial View at Site Aerial View at Site
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Construction Photos May, 2012
Aerial View at Site Aerial View Lift Span
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Construction Photos July, 2012
Aerial View at Site Aerial View Lift Span
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Construction Photos Aug, 2012
Aerial View at Site Aerial View Lift Span
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Construction Photos Jan, 2013
Remove Existing Span Cutting Girders
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Construction Photos Jan, 2013
Existing Bridge Removed New Bridge Positioned
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Construction Photos Jan, 2013Almost In Final Position
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Construction Photos Jan, 2013
Jubilation! Pride!
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Questions,Thank you.