An Overview of the SIBC Process and Projects. Presented By: Rebecca Nix, SE Michael Arens, SE Michael Baker International February 2015

Transcription

1 An Overview of the SIBC Process and Projects Presented By: Rebecca Nix, SE Michael Arens, SE UDOT Michael Baker International February 2015

2 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

3 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

4 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

5 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

6 Moving ABC to More Mainstream FHWA s Encouragement Project Showcases Industry Presentations Development of Guidance Documents Move into Bid-Build

7 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

8 Overview of SIBC Guide Introduction of SIBC Owner Considerations Design Considerations Construction Considerations

9 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

10 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

11 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

12 Challenges to Evaluate During Planning of SIBC Include: Profile Changes Limited ROW for Staging Geometric Constraints Utility Impacts Lack of SIBC Experience

13 For the Owner:* Define Desired Benefits How Fast? Detour Required? Incentives / Disincentives Procurement Method Public Involvement Plan *(see Table 2-4 of SIBC Guide)

14 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

15 SIBC Can Increase Cost with: $ Slide Equipment Labor for Slide Right-of-Way (ROW) Temporary Supports Time/Penalty Costs (RISK) First-Time Costs

16 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

17 SIBC Bridge Layout Options (Continued) Foundation Solutions Micropiles Straddle abutments or bent Spread Re-Use existing

18 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

19 Types of Slide Systems Industrial Rollers Teflon Pads

20 Types of Slide Systems (Continued) Winches & Mechanical Pulling Devices Hydraulic Jack Post-Tensioned (PT) Jack

21 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

22 SIBC GUIDE, Information, and Presentations =