emergency response to a bridge collapse: a case …...construction $11.2m $12.6m $16.9m i-75 lane...
TRANSCRIPT
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our people and our passion in every project
EMERGENCY RESPONSE TO A BRIDGE
COLLAPSE: A CASE STUDY
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NINE MILE ROAD over I-75
Presentation Outline
Project Overview
Communication and Coordination
Design and Construction
Summary and Lessons Learned
Questions and Answers Au
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Public Opinion
Project Positively Received
Use of Social Media by MDOT
MDOT Twitter
Followers
MDOT Facebook Fans
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Preliminary Engineering
Minimum Vertical Clearances
During Construction (14’-6”)
Post Construction (14’-9”)
Future I-75 Buildout (14’-9”)
Horizontal Clearances
Allow for current and future I-75 alignment
Superstructure and abutments to remain in future configuration
Design structure for future median pier shift
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Pre-Bid Communication
1 on 1 Confidential Meetings
Alternative Technical Concepts
Addenda
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Pre-Bid Focus
Bridge Geometry and Future Conditions
Proposed and Future Pier Location
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Steel Solutions
Fabricator and D/B Worked Hand-in-Hand
Competitive Cost
Unbelievable Schedule
Geometric Constraints = Steel
Historically Long Steel Lead Times
Cost a Concern
Pre-Bid Focus
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Bid Letting
Bids Opened on September 30, 2009
Only 5.7% over Engineer’s Estimate Bid Results
Construction $11.2M $12.6M $16.9M
I-75 Lane Rentals $3.9M $1.9M $4.0M
Bridge Rentals $510K $1.3M $700K
Incentive/Utilities $600K $600K $600K
Total $16.2M $16.4M $22.2M
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Use of Project Website
Weekly Progress Meetings
Over the Shoulder Review Meetings
MDOT Review Times Expedited
Post Letting Communication
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Project Start Up
Award on 10/07/2009
Structure Study Submitted on 10/12/2009
Steel Design, Load Rating, Shop Dwgs
Submitted on 10/16/2009
Shop Drawings Appv’d on 10/22/2009 and
Fabrication Begins Immediately
BEFORE AFTER!
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STEEL DESIGN
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DESIGN
• LIVE LOADING
• HL-93 MODIFIED
• Michigan Legal and Permit vehicles
• 28 Legal truck configurations
• 20 Routine permit trucks
• Positive and negative moment configurations for each truck
• Pedestrian deflection limitations, L/1000
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Substructure Design
Steel Rebar Now Critical
Change in Abutment Concept
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Aesthetics and Public Meeting
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At-Risk Work
Proposed Pier Construction
Future Pier Foundation Piling
Future Pier Sheet Piling
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Setting Beams
Beam Setting on November 17, 2009
Night Closures of I-75
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ERECTION
• SEQUENCE
• Splice over SB I-75 done on the ground
• Set first span with (2) over night closures on SB I-75
• Set second span with (1) over night closure on NB I-75
• Splice over NB I-75 done in the air
• Completed connections over next few days
SB I-75 NB I-75
Future Pier Location
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ERECTION
• GROUND SPLICE
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ERECTION
• SPAN 1 GIRDER ERECTION
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Superstructure
Deck Cast in Cold Weather 11/29/09
Heaters and Insulation Used
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Bridge Opens to Traffic!
December 11, 2009
Ribbon Cutting Ceremony Held Later
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Summary
Unanticipated Collapse Results
in Successful D/B in Michigan
Allowed Fast Delivery WITH
Time to Plan for the Future
Designer-Builder-Owner a True
Team Throughout the Project
Communication and Positive
Attitudes Key
NINE MILE ROAD over I-75
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Acknowledgements
Owner:
Builders: Designers:
Mansell Associates
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Questions?
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