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National Value Engineering Award
Pre-Construction
Engineering
less than $25 million
Most
Value Added
Proposal
Presented by the AASHTO Value Engineering Technical Committee
August 4, 2015
Montana Department of Transportation
Flathead River – 3 Miles North West of Big Fork
For Demonstrating Outstanding Value Engineering Achievements
in Teamwork, Cost Savings, Enhanced Performance, or Expedited Project Delivery
that Resulted in an Overall Improved Business Practice
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FLATHEAD RIVER BRIDGE 3 MILES NW BIGFORK
2015 AASHTO VE CONFERENCE
PRESENTATION
PRE-CONSTRUCTION ENGINEERING (<$25M)
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OVERVIEW • LOCATION:
– Northwestern Montana near the towns of Big Fork and Somers
• Located over the Flathead River
• Transition between flat terrain and rolling hills
• PURPOSE AND NEED:
– Improve safety and mobility by replacing the functionally obsolete structure and the bridge approaches
– The structure ranked high for seismic retrofit because of its fracture critical two-girder system
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OVERVIEW - continued
• PROPOSED SCOPE:
– New alignment
– Construct new 736 foot, 3 span bridge
– Complex 1.4 mile reconstruction project
• ORIGINAL PROJECT COST = $24.3M
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OVERVIEW - continued
• CONSTRAINTS: – 4(f) Fish Wildlife and Parks – fishing access site
– Environmental issues (wetlands, bull trout, etc.)
– High risk Right of Way acquisition
• CONSIDERATIONS: – New offset alignment
– Liquefaction may occur during a high seismic event at the end bents
– Deep Water Foundation constructability
– Flathead County Master Trail Plan
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VE/VA STUDY RECOMMENDATIONS
• 1A - New Alignment or Existing - Evaluate Bridge Foundation Types
• 1B - New Alignment – Evaluate Ground Improvements Beneath Approach Embankments
• 2A - Existing Alignment – With Detour Bridge During Construction
• 2B - Existing Alignment – With Road Closure During Construction
• 3A - Either Alignment – Eliminate Shared Use Path • 3B - Either Alignment – Design For Future Expansion
For Shared Use Path
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RECOMMENDATION #1A – New Alignment -
Evaluate Bridge Foundation Types
Other Options
• 3-72” Diameter Piles
• 2 Rows of 5-48” Diameter Piles for additional stiffness
• 2-96” Diameter Piles for accelerated construction
• Must meet “no rise” requirement
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RIVER BOTTOM CROSS-SECTION
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Recommendation #1B – New Alignment – Evaluate Ground Improvements Beneath Approach
Embankments
Improve Soil Properties Using Compaction Grouting Original Design: Stone columns used to mitigate potential for liquefaction and lateral spreading at both abutments. Proposed Change: Improve the soil properties at both abutments using compaction grouting. Justification: Compaction grouting improves soil density and increases soil strength. Anticipated reduced mobilization cost and less equipment, can limit treatment to target zone in soil profile, can stage grout pattern/ hole layout as needed. Decreased construction time. POTENTIAL COST SAVINGS = $0.7M
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Recommendation #3B – Either Alignment – Design For Future Expansion For Shared Use Path
• Build bridge foundation and superstructure to accommodate future Shared Use Path
• Construct Path when trail connection is constructed
• Potential Cost Savings = $0.91 M • Current design does not include a path along the length of the
project
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The Study Team applied the principals and practices of the Value Engineering Job Plan which resulted in cost reduction and performance benefits in the following areas:
• Cost & schedule savings as compared to original design
• Project improvements as compared to original design
• Improved constructability
Total potential cost savings of $9.73 million, a 40% reduction in the total project cost
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SUMMARY • 30-35% reduction in the construction schedule is
anticipated • Innovative techniques to solving complex geotechnical
design • Maintained safety and traffic operations • Reduced Environmental, R/W and Fishing Access site
impacts • Reduced work zone impacts to users • Improved constructability of the bridge • 2 value added ideas:
– Add lighting or conduit to shared use path along the structure
– Extend the separated path along the length of the project to include the fishing access
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