EMERGENCY RESPONSE TO A BRIDGE COLLAPSE: A CASE …...Construction $11.2M $12.6M $16.9M I-75 Lane...

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EMERGENCY RESPONSE TO A BRIDGE

COLLAPSE: A CASE STUDY

our people and our passion in every project our people and our passion in every project

www.bergmannpc.com

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



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Acknowledgements

Owner:

Builders: Designers:

Mansell Associates


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www.bergmannpc.com


Questions?


EMERGENCY RESPONSE TO A BRIDGE COLLAPSE: A CASE …...Construction $11.2M $12.6M $16.9M I-75 Lane...

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Transcript of EMERGENCY RESPONSE TO A BRIDGE COLLAPSE: A CASE …...Construction $11.2M $12.6M $16.9M I-75 Lane...