Application of Accelerated Bridge Construction for Local Agencies
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1 Application of Accelerated Bridge Construction for Local Agencies APWA Public Works Conference November 9, 2017 Dorie Mellon Senior Bridge Engineer, Caltrans Matt Randall Senior Engineer, County of Placer
2 Accelerated deployment of innovation that meets customers needs and increase efficiency of project delivery Accelerated Bridge Construction Workgroup: Gary Antonucci - Moffatt & Nichol/ACEC Dorie Mellon - Caltrans - Structure Policy & Innovation Ryan Moore - City of Sacramento Linda Newton - Caltrans - Local Assistance Matt Randall - Placer County
3 Accelerated Bridge Construction (ABC) ABC uses the most efficient combination of innovative planning, design, materials and construction to significantly reduce construction related impacts by reducing the number of onsite construction days and/or minimizing traffic disruption. Minimize Construction Impacts Project Goals & Constraints 3
4 FHWA Every Day Counts (EDC) FHWA set of initiatives to deploy innovation aimed at: Shorten the project delivery process Enhanced roadway safety Reduced congestion Improve environmental sustainability
5 Elements of a Bridge from Foundation to Superstructure ABUTMENT SUPERSTRUCTURE Bent 2 Bent 3 COLUMN BENT CAP Bent 4 Abutment 1 PILING FOOTING Abutment 5 A bridge is a structure that spans an opening greater than 20 feet.
6 Conventional Construction Falsework TYP FW SYSTEM
7 Conventional Construction Reinforcing Steel (Rebar)
8 Conventional Construction Cast-in-Place Concrete
9 ABC Methods Prefabricated Large Bridge Move Slide-In Launch
10 ABC Prefabricated Bridge Elements & Systems Bridge elements are manufactured at an off site facility and assembled at the project location
11 Ultra-high Performance Concrete (UHPC) connections for prefabricated bridge elements PROPERTIES Strong Flexible Durable Excellent Bonding Self Consolidating ADVANTAGES Robust connections Simplified construction Better long term performance 11
12 Slide-In Bridge Construction The new bridge is constructed next to the old bridge and then slid into place overnight or during off peak hours Nevada I-15 Bridge Hartford I-91 Bridge Replacement, Vermont
13 Large Bridge Move Self Propelled Modular Transporters Bridges or large portions of bridges are built off site and moved in to place with self propelled modular transporters (SPMT s) Space Shuttle SPMT move through downtown LA I-215 Highgrove Underpass San Bernardino County 4500 South Bridge, Utah 2007
14 ABC Incremental Launching Bridge superstructure is assembled at one end of the bridge and launched across to the other end of the bridge.
15 Pfeiffer Canyon Bridge Launch
16 ABC Advantage - Time Minimize construction impacts by reducing the amount of construction time. Traffic impacts reduced from years to months and from months to days. Saving time while minimizing headaches for motorists.
17 ABC Advantage - Safety (Fewer Construction Days = Increased Safety) ABC technologies help improve motorist and worker safety by shortening lane restrictions and by performing construction away from traffic. Each year approximately 600 fatal crashes occur in USA work zones. On average 1000 CT vehicles are struck each year.
18 ABC Advantage - Mobility Conventional construction typically leads to heavy congestion and long travel delays ABC dramatically reduces mobility impacts Minimize Lane closures Duration of onsite construction activities Need for detours Realizes savings in user costs to the public Local businesses Transportation of goods Air quality Noise
19 ABC Advantage - Constructability Less sensitive to weather conditions More likely to deliver single season construction Effectively addresses unique and challenging site conditions
20 ABC Advantage - Environment Reduced Environmental Impact Reduced construction time allows scheduling around crucial times for plant growth and animal life. Eliminating falsework keeps construction activities out of the stream. Conduct construction activities offsite Reduce wetland mitigation
21 Cost Considerations ABC can be the most cost effective means of construction when considering total project cost. Maintenance of traffic Project Administration Environmental Compliance Lowered vertical profile Environmental Mitigation 21
22 Case Study: MassDot Fast14 Replaced 14 bridges in 10 weekend closures along Interstate 93 through the city of Medford Project was completed on budget and ahead of schedule The I-93 Fast 14 project proves that America is ready, willing, and able to dream big and build big. US Secretary of Transportation Ray LaHood
23 Case Study: Nevada I-15 Bridge ABC saved $10M and 6 months COST MORE, SAVE MORE As stated by the contractor who proposed the use of ABC: "We knew that ABC would cost more, but we could make up the difference saving on lane rentals, building the crossovers, limiting excavation and reducing time and overhead."
24 San Mateo Bridge Replacement Project 2016 Caltrain track parallel to Route 82 Replace four 100 year old structures over 4 weekends Bridges assembled near the site and moved into place by SPMT during 16 hour track closure
25 Poplar Avenue Improve vertical clearance and road width below bridge Original Structure 1903 Replacement Structure 2016
26 Construction Sequencing Beyond the bridge (typ) Existing Abutment Stage I Activities Stage Complete Stage II IV Activities VI Activities Structure Stage Stage III V Activities Track is raised to final elevation prior to 1. Install Build Roll Install in roll-out crash new bridge. beams temporary and restraining roll-in (not supporting shown) system system where change Lift over temporary (by PCJPB). restraining system. excavation (prior Finish Remove and to backfilling roll change existing out central taking over). bents behind span. and the supporting abutmens system. with soilcement Complete mix. existing roadworks place. 2. All Construct Crane utilities lift existing abutment relocated. end walls. spans Complete Remove footing track. including side walks. construction Place precast Excavate Complete Open to road behind pile trackwork. traffic abutment installation. seat units and secure in the for walls. optimum use. place. 4. Disengage Test run. existing bridge Backfill Open to behind traffic. the abutments with soil-cement mix.
27 Bridge Construction Substructure Strengthening Prior to Track Shutdown Bridge Demolition 5 AM Installation of Abutments 11 AM SPMT bridge move 2 PM 16 Hour Construction Window
28 ABC in California
29 Programmatic Approach ABC Evaluated for Every Bridge Project ABC Decision Making Guidance (2015) Construction Time Environmental User Costs and Delays Site Conditions Risk Management Economy of Scale The evaluation of ABC is triggered during preliminary project development when adjustments to funding, right of way requirements and the environmental document can be accomplished with relative ease.
30 Working Days (ABC vs Conventional) Construction Completion Time (CCT): Estimate of the number of total onsite construction working days required for the bridge construction work. Construction Impact Time (CIT): Estimate of the number of working days that a construction activity will affect a specified impact such as traffic or environmental constraints.
31 Choosing the right ABC solution Early consideration of ABC Identify project goals, constraints, and resources Communicate with stakeholders Do the benefits balance the costs? Improving delivery through Innovation
32 ABC Single Span Programmed Projects Hardscrabble Creek Slide-In Craig Creek Prefabricated North Fork Mill Creek Prefabricated ABC methods delivered: One season construction Significantly reduced environmental impact Minimal traffic disruption Well suited to streambed restoration
33 Fort Goff Creek Bridge Siskiyou County Route 96 Streambed Restoration Project GOALS: Restore Fish Passage Single Season Construction Reduce Environmental Impacts Quality Concrete in Remote Location SOLUTION: Prefabricated Design
34 Fort Goff Construction: Prefabricated Bridge 02-SIS Bridge No
35 Hardscrabble Creek Lateral Slide DN-199 GOAL: Reduce Construction to a Single Season Reduce Traffic Disruption from months to hours SOLUTION: Lateral Slide WHAT SUPPORTED THE SOLUTION?: Room Adjacent to Route for Construction Additional $ for Bridge Construction
36 Caltrans Multi-Span Precast Pilot Projects 2 projects under construction D4 Laurel Street OC D6 Route 46/99 Sep Focus on connections & constructability Gather lessons learned Improve efficiency & reduce risk Educate project development staff, construction staff and contractors 36
37 Laurel Street Overcrossing Pilot Project Vallejo CA, Route 780 Precast columns and cap were set in 3 hours under full night closure of 780
38 Laurel Street Overcrossing Pilot Project Vallejo CA, Route 780 Rapid strength concrete deck. Concrete cures in 4 hours Precast Wide Flange Girders set in 2 nights
39 UHPC connection mock up
40 ABC Impact on Cost CAPITAL & SUPPORT COSTS Maintenance of traffic Wetland mitigation Storm water Contract administration Construction inspection Temporary right of way USER COSTS Traffic delays Access to essential services Impact to local business Air quality Noise Transportation of goods
41 User Cost Consideration CONVENTIONAL METHODS ABC METHODS Lengthy detours and traffic delays Long term frontage business impacts Reduced detours and delays Reduced time of business impact Negative public perception of lengthy construction duration Positive perception of speedy construction Environmental impacts over multiple seasons of construction Reduced environmental impacts due to single season construction (plants, animals, air quality, water quality, noise)
42 Full Road Closure for Work Zone Operations Accelerate construction Cost savings (MOT, more efficient work area) Improve quality (full access to roadway results in higher standards in efficiency and quality) Enhance safety (separate construction activities from through traffic) Increase favorable public sentiment
43 Public Outreach for ABC BENEFITS Traffic avoidance Increased awareness Decreasing impatient behavior Building trust Project buy-in METHODS Signage Project specific websites Local newspaper & radio Social media* Mobile apps* Town hall meetings*
44 Keys to ABC success Embrace Innovation Define project goals Early consideration Total Project Cost Identify user cost benefits Include in initial HBP application when appropriate Communicate with stakeholders
45 ABC Resources FHWA Center for Accelerating Innovation: Every Day Counts STIC Network AID Demonstration Resources FHWA ABC: 2/abc.cfm ABC University Transportation Center: STIC ABC: Coming Soon: AASHTO Guide Specification for ABC
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