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Overview of Lateral Slide in MN
Doing ABC with Design-Build
Tony Lesch, MnDOT Bridge Design-Build Engineer
September 17, 2015
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Outline
• Delivery Methods– Design-Bid-Build– Design-Build– CMGC
• Lateral Slide at Larpenteur Ave.
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MnDOT Delivery Methods
100% Design by MnDOT Bid Construction by Contractor
Design-bid-build
30% Design
RFP Creation
Proposals & Design
Construction
Design-build
Time
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CMGC
CMGC
100% Design Bid Construction by Contractor
DBB or CMGC
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MnDOT’s DB Program
• 30 Awarded Projects since 1997
– 20 Best Value• $1 - $234 Million
– 10 Low Bid• $2.2 - $19 Million
• $1.6 Billion Total
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MnDOT’s DB Program
Benefits– Accelerated Project Delivery– Innovation
• Competing Designs• Alternative Technical Concepts (ATCs)
– Risk Transfer (e.g. quantities)– Reduced Cost (?)– Flexibility
Drawbacks– May not be cost-effective– Risk Transfer (e.g. environmental, third party)– Oversight resources necessary
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MnDOT’s DB Program
Standard Uses– Complicated Major Projects (10)
• $50-250 million• Involves all functional areas• Significant complexity
– Midsize, Partially-Complicated Projects (10)• $20-50 million• At least 1-2 complicated areas• Possibly in need of acceleration
– Emergency Accelerations (3)• Improvement of dangerous intersections• I-35W bridge collapse
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MnDOT’s DB Program
Unique Uses– Intersection Conflict Warning System (1)
– Groupings of Similar Work Types (3)
– Geotechnical Challenges (2)
– Accelerated Bridge Construction Trial (1)• Unfamiliar design and construction• Likely CMGC project if let today
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MnDOT’s DB Program
Standard Uses– Complicated Major Projects
• $50-250 million• Involves all functional areas• Significant complexity
I-35E MnPASS
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35E MnPASS Project
• DB project to add express lanes (MnPASS lanes) to existing interstate corridor
• Awarded to Ames Construction in July, 2013
• $98.4 Million• Completion in Fall 2015
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35E MnPASS Project
• Project Details– Roadway– 9 Bridges– Drainage– Utilities– Noise Walls– MnPASS Infrastructure– Maintenance of Traffic
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Best Value
• Largest scored category was MOT• Contractor to propose number of closure
days:– I-35E first year– I-35E second year– Cross Streets
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Best Value
• Ames Proposal– Close Larpenteur for
only 47 Days– ATC to use SIBC
(contract required all bridges cast-in-place)
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Larpenteur Ave. Bridge
• 4-span bridge built in 1958
• 4 lanes, narrow shoulders, one narrow sidewalk
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Larpenteur Ave. Bridge
• 2-span bridge built in 2014 – longer spans• 4 lanes plus turn lane, wider shoulders,
wider sidewalk
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Larpenteur Ave. Bridge
187’
93.5’ 93.5’
185’
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SLIDE IN BRIDGE CONTSTRUCTION
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Temporary Supports
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Temporary Supports
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SIBC
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SIBC
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SIBC
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SIBC
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SIBC
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Slide System
• Hydraulic Jacks• Jack Floats• Dog Plates
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Slide System
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Slide System
Teflon
Stainless Steel
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Slide System
• Teflon on Polished Stainless Steel
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Highlights
• Slide both spans together• No Live Traffic• Test Pushes• Full Closure of Interstate• Plan to move in one overnight closure• Took two nights
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Larpenteur Ave. Bridge
What issues were encountered?
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Issues
Slide Table Cast Against Pier, Damaged Concrete
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Issues
Tolerance on track system fabrication
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Issues
Tolerance on track system fabrication
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Issues
Bridge Walked Sideways
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Issues
Bent/Binding Guide Brackets
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Issues
Bent/Binding Guide Brackets
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Lessons Learned
• Use lubricant (dish soap), but not too muchBridge Slide System
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Lessons Learned
• Use lubricant (dish soap), but not too much• Use a Single Pump (keep it simple)
Bridge Slide System
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Lessons Learned
• Use thicker teflon• Use thicker elastic medium for deviations in
concrete and steel• Design to reduce field welding• Use readily-available materials (and reusable)• Design for “field friendly” tolerances• Secure the sliding mechanism to bridge
Bridge Slide System
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Lessons Learned
Teflon
Stainless Steel
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Lessons Learned
• Prepare contingency plans• Survey a lot (after every step and load)• Clearly identify stopping points for critical
locations• More Lighting• Radio Communication• Use scaffold/walkways rather than man lifts
Slide Execution
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Lessons Learned
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Title
Questions?
Implementation