Accelerated Bridge Construction

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Accelerated Bridge Construction 2010, a presentation on advanced bridge building techniques by the Utah Department of Transportation

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<ul><li>ABC By 2010 UTAH ABC by 2010 Department of Transportation ACCELERATED UDOT goals BRIDGE CONSTRUCTION BY 2010 Accelerated Bridge Construction Standard practice by 2010 How have we done? What was needed? Fred Doehring Methods of construction UDOT Structures Standard details Commitment to a program Vision for Family of ABC Methods ABC Phase 1 Early implementation of ABC Accelerated Scanning Tours Bridge Construction Looked at what other states were doing Workshops held Brought all stakeholders together Precast Modular Structure Accelerated Fast Track Concrete Elements Construction Large Prefab. Placement Methods Geotech Work Contracting CMGC Identified what was needed Components Design/Build Prefabricated Components SPMT Sliding Geofoam Prioritized needs Looked at several specific pilot projects ABC Phase 1 ABC Methods Used Results of Phase 1 work Several key standards were Precast Deck Panels developed Voided Slabs Precast Full Depth Deck Panels Precast Substructures Manual on Self Propelled Modular Transporters (SPMTs) Abutments and Bent Caps Development of specifications Precast Superstructures and manuals for each Crane, Sliding, and SPMT Several pilot projects initiated and built 1 </li><li>ABC By 2010 Precast Deck Panels - Full Depth Precast Deck Panels - Full Depth Precast Deck Panels - Full Depth Precast Deck Panels - Full Depth Precast Deck Panels - Full Depth Precast Deck Panels - Full Depth 2 </li><li>ABC By 2010 Precast Deck Panels - Full Depth Precast Deck Panels - Full Depth Voided Slabs Voided Slabs Precast Substructure Precast Substructure 3 </li><li>ABC By 2010 Precast Substructure Precast Substructure Precast Superstructure - Crane Precast Superstructure - Crane Precast Superstructure - Sliding Precast Superstructure - Sliding 4 </li><li>ABC By 2010 Precast Superstructure - SPMT Precast Superstructure - SPMT Precast Superstructure - SPMT Precast Superstructure - SPMT Precast Superstructure - SPMT Precast Superstructure - SPMT 5 </li><li>ABC By 2010 Precast Superstructure - SPMT Precast Superstructure - SPMT UTAH ABC Phase 2 Department of Transportation Standardized the remainder of prefabricated ACCELERATED element types BRIDGE CONSTRUCTION BY 2010 Developed details for: Precast substructures Piers, Abutments, walls, culverts Where are we going? Precast Approach slabs Precast Girders Pre-tensioned Bulb Tees Michael Culmo Post-Tensioned Bulb Tees CME Associates, Inc. Deck Bulb Tees Developed Specifications and Manuals Workshops were held for industry input Connections with Grouted Splice Couplers ABC Phase 2 Emulates a reinforcing steel lap splice Other work completed in Phase 2 Used in precast parking garages and Reviewed computer monitoring data from first stadiums and bridges round of SPMT bridge moves New seismic research coming Refined Phase 1 work based on lessons learned in construction Deck Panel standards and specifications SPMT Manuals 6 </li><li>ABC By 2010 Connections with Grouted Splice Couplers Typical Connection Details Installation video on Youtube Search Georgia Bridge Pier Column or wall panel to footing connection Typical Connection Details Current Typical Details Single column hammerhead Column to cap connection Two column bent Three column bent Current Typical Details Current Typical Details Columns Footings Rectangular are possible, Full Precast but not preferred Round columns are difficult For smaller footings to precast Must be cast vertically Use Hexagonal or octagonal shape Can be cast on side (one side open) Shim and grout under footing through ports in footing 7 </li><li>ABC By 2010 Current Typical Details Current Typical Details Footings Pile supported Partial Precast footings For larger footings Use corrugated Precast designed to support DL of bridge pipe forms CIP extensions designed for Used for integral other loads abutment stems Precast Portion also CIP Extension Shim and grout under footing through ports in footing Pretensioned Bulb Tee Girders Pretensioned Deck Bulb Tee Girders Post-tensioned Bulb Tee Girders Integral Abutment Details 8 </li><li>ABC By 2010 Cantilever Abutments and Walls Stage 1 Use corrugated pipes in stems to reduce weight To be filled with concrete in the field Reduces the number of pieces 1. Drive Piles Stage 2 Stage 3 1. Install pier wall panels. (day 4) 2. Connect to footing via grouted 1. Place footings over pile and set splice couplers (day 4) to grade and alignment (day 1) 3. Fill voids with concrete to within 2. Cast concrete in voids around 3 feet of top (day 5) piles (day 1) 4. Install rebar cage in top of voids 3. Cast concrete between footings extending 2 feet above (day 5) if required (day 2) 5. Joints between may be grouted or left dry Stage 4 Final Construction 1. Install pier cap, set to grade (day 6) 2. Pour concrete through ports to fill voids and make connection (day 7) 3. Install precast beam seats (day 7) 9 </li><li>ABC By 2010 Box Culverts Tolerances Precast boxes, aprons, and walls Tolerance details developed for all critical elements Based on PCI Tolerance manual MNL-135-00 Tolerance Details Tolerance Details Splice couplers Columns Precast Full Depth Deck Panels Precast Full Depth Deck Panels First Generation Standards completed in Phase 2 Modifications Phase 1 UDOT ABC Program Use Longitudinal Post-Tensioning to Connect Panels AASHTO Code Recommendation More than 15 project built to date Better performance over time (no leakage through joints) Costs are coming down Use multi-strand PT systems Developed for slabs Welded plate details are not desirable More Flexible Time Allow blind pockets for shear stud connection Based on recent research...</li></ul>

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