Chincoteague Bridge Replacement Doug Neely, PE AASHTO Technical Subcommittee for Movable Bridges May 16 th , 2011
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Chincoteague Bridge Replacement
Doug Neely, PE
AASHTO Technical Subcommittee for Movable Bridges
May 16th, 2011
Project Location
• Bridge on Rte 175 Over Black
Narrows and Lewis Creek Channel
• Accomack County and Town of
Chincoteague, Virginia
• 100 Miles from Norfolk
• Owner: VDOT
• Designer: Hardesty & Hanover
• Contractor: American Bridge
• Contractor Bid: $68.7 million
• CEI: Jacobs
Old Bridge Alignment
Old BlackNarrows Bridge
Old ChincoteagueSwing Bridge
Site Plan
Existing Site Conditions
Town of Chincoteague & Marsh Island
Old Chincoteague Bridge
Existing Soil Conditions
C-3
C-4
C-5
C-2
Maddox
C
Alignment Study
Selected Bridge Alignment
Old ChincoteagueSwing Bridge
Old BlackNarrows Bridge
New SingleLeaf Bascule
New Rte 175 Bridge
New Marsh IslandConnector Bridge
Site Plan
Constructability Adjustment
Site Plan New SingleLeaf BasculeNew Rte 175 Bridge
New Marsh IslandConnector Bridge
Bascule Span Overview
• Fabricator: Steward Machine
• 92’-0” Span Length
• Closed Pit Pier
• 5” Half-Filled Grating*
• 1662 Kip Leaf
* With 1” overfill
Bascule Span Typical Section
Bascule Span Clearances
Span Closed
• 60’-0” navigable channel
• 15’-8” min. clearance
Bascule Span Clearances
Span Open
• 60’-0” navigable channel
• Unlimited vertical clearance
Bascule Span Fabrication
Bascule Span Fabrication
• Bascule span and towers shop
assembled
• Included permanent assembly
of trunnion
• Rack supports after trunnion
shaft and hub
Bascule Span Fabrication
Bascule Pier Deck Removed
Bascule Pier Stringers Removed
Bascule Span Removed
Bascule Pier Construction
Bascule Pier Construction
Bascule Pier Construction
Bascule Pier Construction
Operating Machinery
• Fabricator: Hardie-Tynes
• Reducers: Chicago Gear
• 26” Trunnion diameter
• Gear driven
• 3:40 operating cycle time
• 65mph max. sustained wind
Operating Machinery
• 10hp squirrel cage w/ chain drive
• Control of e drive at desk
• Manually install chain
• Two 75hp motors
• Primary: 122hp @ 870rpm
• Secondary: 224hp @ 150rpm
Electrical System
• Contractor: Dorey Electric Company
• Vendor: Link Control Systems
• Control System: Electromagnetic relays
• Interlocking control logic
Electrical System
• Service: 3 phase, 4 wire, 200 amp (min.) at
480 volts
• 150kW standby generator
• System A / System B
Bascule Span Complete
Bascule Span Complete
Questions?
• Dedication Ceremony: October, 2010
• Winner: 2010 ACI Infrastructure Award
Related Documents
