March 5, 2013
Vincent Gastoni, PE
Delivering Major Minnesota Bridges
Hastings Bridge Design Build Project
MnDOT – ACEC/MN Annual Conference
Leading TogetherInnovative Solutions for an Evolving Industry
HASTINGS TIED ARCH BRIDGE | REDUNDANCY AND SERVICE LIFE
Redundancy
and Service Life
Project Location Map
Base Map Source: Google Maps
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Project Overview - Existing Bridge
• Highway 61 over Mississippi River
• Highest daily two-lane highway traffic volume in the state
• MnDOT Chapter 152 Bridge
• Project replaces 1950 steel arch truss
• Lowest 1% in the state for overall sufficiency
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Project Overview - Aerial Plan
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Project Overview - Design-Build Process
• Design-Build SOQ Issued:
October 2009
• Design Build Selection:
June 2010
• MnDOT identified two acceptable alternatives
• RFP allowed Alternative Technical Concepts (ATC’s)
• Design Build Team:
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Project Overview - Design-Build Process
INNOVATIVE RFP FEATURES
• Alternative Technical Concepts (ATC’s)
– Allow innovation and flexibility
• Pre Approved Elements (PAE)
– Reduce risk and provide best value opportunities
Redundancy Concepts for the Main Structure Segment
o Scour Analysis Method
o Bridge Fixity and Thermal Expansion of Bridge No. 19004
o Refined Analysis Method
o
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Project Overview - Design-Build Process
TECHNICAL PROPOSAL SCORING
• Bridge
34 Points
• Environmental Management
6 Points
• Maintenance of Traffic
5 Points
• Public Communications
2 Points
• Schedule
3 Points
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Project Overview - Design-Build Process
TECHNICAL PROPOSAL SCORING
• Bridge
– Durability/Quality of Bridge No. 19004
34 Points
13 Points
– Inspection/Maintenance
9 Points
– Geotechnical
5 Points
– Erection of Bridge No. 19004
4 Points
– Demolition of Bridge No. 5895
3 Points
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Project Overview - Design-Build Process
SCORING DRIVES INNOVATION
• Selection =
Bid Price
Technical Score
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Project Overview - Design-Build Process
SCORING DRIVES INNOVATION
• Selection =
• Win Strategy=
Bid Price
Technical Score
Minimize Bid Price
Maximize Technical Score
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Project Overview - Design-Build Process
SCORING DRIVES INNOVATION
• Selection =
• Win Strategy=
Bid Price
Technical Score
Minimize Bid Price
Maximize Technical Score
• Use innovative ATC’s & PAE’s to:
– Minimize Risks
– Optimize Design Solution
Need A Better Mouse Trap
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Design-Build Process – Base Concepts
MnDOT RFP Baseline Options
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Design-Build Process – Base Concepts
MnDOT Cable Stayed Option
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Design-Build Process – Base Concepts
MnDOT Arch Option
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Base Concept Evaluation
• Evaluate Base Designs
– Preliminary engineering analysis
– Cost estimating exercises
• Produce Comprehensive Evaluation Matrix Tool
– Material costs & risks
• Develop Alternative Designs
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Innovation – Develop Alternatives
• Evaluate Alternative Designs
– Prescriptive design/performance criteria
– Aesthetic requirements
– Technical scoring criteria
– Cost & schedule impacts
• Add to Comprehensive Evaluation Matrix Tool
• Develop Overall Best Value Technical Approach
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Innovation – Develop Alternatives
Lunda/Ames-Parsons Alternatives
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Innovation – Develop Alternatives
•
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Innovation – Develop Alternatives
•
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Innovative Winning Alternative
• Successful Proposal-Free Standing Tied Arch $120M
• 545 ft. Main Span
Project Architect: Bradley Touchstone, Touchstone Architecture
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Innovative Winning Alternative
Project Architect: Bradley Touchstone, Touchstone Architecture
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Visual Quality Process & Color Selection
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Aesthetic Lighting
Lighting Design: Illumination Arts
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Innovative Features - Concrete Tie
• Best value solution
• More durable than steel box
• Higher level of redundancy
• No shop assembly and fit-up issues
• Ease of inspection/maintenance
• Active tension control
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Innovative Features - Concrete Knuckle
• Framed into pier and rib
• Post-tensioned anchorage
• Improved durability/fit-up
• Highly redundant
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Innovative Features – Steel Box Arch Rib
• Aesthetically pleasing
• Simplified fabrication
• Improved maintenance
• Best Value solution
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Innovative Features - Floor System Redundancy
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Innovative Features - Erection
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Innovative Features - Erection
• Build low
TEMP BRACING
ARCH RIB
FLOOR SYSTEM
TEMP TIE & FORMS
TEMP LIFTING CONNECTION
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Innovative Features - Erection
• Build Low On Land
TEMP BRACING
ARCH RIB
FLOOR SYSTEM
TEMP TIE & FORMS
TEMP LIFTING CONNECTION
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Innovative Features - Erection
• Build Low On Land
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Erection
• Move onto Barges Using SPMT’s
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Innovative Features - Erection
• Move onto Barges Using SPMT’s
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Innovative Features - Erection
• Float
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Innovative Features - Erection
• Float
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Innovative Features - Erection
• Skid
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Innovative Features - Erection
• Skid
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Innovative Features - Erection
• Skid
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Innovative Features - Erection
• Lift
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Innovative Features - Erection
• Lift
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Innovative Features - Erection
• Lockoff
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Innovative Features - Erection
• Get Some Sleep
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Other Innovative Features
• Column Supported Embankment
• Long Span Precast Concrete Beams
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Other Innovative Features
COLUMN SUPPORTED EMBANKMENT
• 4” over 25 years
• CSE -10’x10’ Pile Grid
• Conc. Caps
• Sand/Geogrid
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Other Innovative Features
LONG SPAN PRECAST BEAMS
• Precast Pretensioned Concrete Beams
• 5 Spans of 9-Girder Lines
• 173’-7” Long Span
• Longest Beam Overall length = 174’-3”
• Innovative beam design became the basis of MnDOT’s
new MW Long Span Precast Concrete Beam Standards
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Other Innovative Features
LONG SPAN PRECAST BEAMS
Photos: Joel Mich, Cretex
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Other Innovative Features
LONG SPAN PRECAST BEAMS
Photos: Joel Mich, Cretex
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Other Innovative Features
LONG SPAN PRECAST BEAMS
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Summary
• Innovative RFP Process
• Best Value Approach Drives Innovation
• MnDOT Partnering in Innovation
• Continued Commitment to Innovation
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Thank You
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