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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