An Overview of the SIBC Process and Projects...Slide-In Bridge Construction (SIBC) Is an Accelerated...
Transcript of An Overview of the SIBC Process and Projects...Slide-In Bridge Construction (SIBC) Is an Accelerated...
An Overview of the
SIBC Process and Projects
Presented By: Rebecca Nix, SE Michael Arens, SE
UDOT Michael Baker International
February 2015
ABC – Development to Standard Practice
Procurement Tools to Implement Innovation
Early Development of New Process
Evolution of ABC to Norm
Slide-In Bridge Construction (SIBC) Guide
Design-Build (DB)
Owner Prescribes Outcome with DB Teams Innovating
Fosters Innovation in a Competitive Forum
Transfers Majority of Risk to DB Team
Requires Owner Flexibility
Requires Owner Involvement in Construction
Construction Manager / General Contractor (CM/GC)
Designer & Contractor Innovation
Joint Development of Plans & Specs - Ownership
Continued Partnership of Designer & Contractor into Construction
Gives Owner Authority to Steer Project to ABC
Development of UDOT’s Early Slide-In Bridge
Construction
Design-Build RFP Severely Limited Closure Times
Terrain Not Conducive to SPMTs
Cross-Street Not Primary; Allowed Closures
Approach Slab Sliding with Bridge
UDOT Open & Encouraging
Team Provided Overall Engineering Approach
Moving ABC to More Mainstream
FHWA’s Encouragement
Project Showcases
Industry Presentations
Development of Guidance Documents
Move into Bid-Build
Development of SIBC Guide
Every Day Counts (EDC) II Initiative by FHWA through DOTs
Utah Department of Transportation (UDOT) Assigned SIBC Guide:
Michael Baker International
H. Boyle Engineering
Ralph L. Wadsworth
Overview of SIBC Guide
Introduction of SIBC
Owner Considerations
Design Considerations
Construction Considerations
Slide-In Bridge Construction (SIBC)
Is an Accelerated Bridge Construction (ABC) technique
New bridge superstructure is constructed adjacent to the existing structure while it remains in service
New substructures constructed:
Simultaneously under or behind existing bridge
Immediately after demolition
OR – existing substructures rehabilitated
Benefits to SIBC vs. Traditional Construction
Reduced Traffic/Mobility Impacts
Shortened On-Site Construction Time
Potentially Reduced Project Costs
Enhanced Safety – Workers and Public
Improved Quality & Constructability
Common Applications of SIBC
More Traffic over the Bridge than under
Significant User Cost Savings & Safety
Long Detour/No Detour Routes
Shortened Overpass Bridges
Narrow Bridge or Limited Phasing
Applicable for Common Bridge Replacements
Challenges to Evaluate During Planning of SIBC Include:
Profile Changes
Limited ROW for Staging
Geometric Constraints
Utility Impacts
Lack of SIBC Experience
For the Owner:*
Define Desired Benefits
How Fast? Detour Required?
Incentives / Disincentives
Procurement Method
Public Involvement Plan
*(see Table 2-4 of SIBC Guide)
$ SIBC Can Decrease Cost By:
Eliminate Crossovers or Temporary Bridges
Less Maintenance of Traffic (MOT) & Detours
Reduced Time & Project OH Costs:
DOT Oversight, Administration, and CE&I
Contractor OH Costs
User Costs
$ SIBC Can Increase Cost with:
Slide Equipment
Labor for Slide
Right-of-Way (ROW)
Temporary Supports
Time/Penalty Costs (RISK)
First-Time Costs
SIBC Bridge Layout Options
Shorten Bridge
Build new abutments concurrently
Installing Abutments behind Existing Bridge
Other ABC elements
Working in protected trench
Semi-Integral Abutments Work Best
SIBC Bridge Layout Options (Continued)
Foundation Solutions
Micropiles
Straddle abutments or bent
Spread
Re-Use existing
Temporary Works & Material Design
Calculate Loads for Temporary Supports
Sliding Forces Should Account for Conditions
Temporary Support to Permanent Substructure Connection
Soil Conditions Affect Support Foundations
Bridge to Roadway Connection
Approach & Sleeper Slabs
Joints & Backfill
Roadway Tie-In Design
Types of Slide Systems
Industrial Rollers
Teflon Pads
Types of Slide Systems (Continued)
Winches & Mechanical Pulling Devices
Hydraulic Jack
Post-Tensioned (PT) Jack
Schedule Considerations
Partial Demolition with Phased Bridge Slide
Bridge Demolition & Slide Time
Approach Slab & Roadway
Tie-In
Bridge Layout Considerations
Approach Slab Challenges
Roadway Impacts and Geometry
SIBC GUIDE, Information, and Presentations
www.slideinbridgeconstruction.com
www.fhwa.dot.gov/construction/sibc/
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