Precast Bridges slides
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Fast construction of bridges using precast concrete elements provides benefits to both owner agencies and contractors. For owners, it reduces the duration of work zones, lowering traffic handling costs and accident risks while causing less inconvenience to the public. Contractors benefit from reduced hazards, the ability to accomplish more work in less time with fewer weather delays, and lower costs. Examples are given of bridges constructed rapidly using precast concrete piles, pile caps, piers, abutments, beams, and other elements.
Precast Bridges slides
- 2. TOTALLY PRECAST BRIDGES -- CASE STUDIES Is it possible to design an “Instant Bridge?” Almost! There are many ways to put a bridge together quickly with precast concrete products. BACK FORWARD
- 3. TOTALLY PRECAST BRIDGES -- CASE STUDIES The speed and variety of precast prestressed products and methods give designers many options. Consider these advantages of an all-precast bridge… BACK FORWARD
- 4. TOTALLY PRECAST BRIDGES -- CASE STUDIES Benefits to Owner Agencies: Reduction in the duration of work zones Reduced traffic handling costs Reduced accident exposure risks Less inconvenience to the traveling public Fewer motorist complaints BACK Fast construction benefits owner agencies by reducing the duration of the work zone. Fast construction reduces traffic handling costs and accident exposure risks. There’s less inconvenience to the traveling public, fewer delays, and fewer motorist complaints. According to a report by the Texas Transportation Institute, costs incurred by drivers passing through a work zone (along with engineering costs) can be $10,000 to $20,000 per day. A recent Federal report indicates user costs of $50,000 per day for work zones in urban areas. FORWARD
- 5. TOTALLY PRECAST BRIDGES -- CASE STUDIES Benefits to Contractors: Reduced exposure to hazards More work -- less time Fewer weather delays Contractors benefit from reduced exposure to traffic hazards. More work can be accomplished in less time, with fewer weather delays. Costs are lower for forms, skilled field labor, scaffolding and shoring, and cranes. Lower costs Less skilled labor BACK FORWARD
- 6. TOTALLY PRECAST BRIDGES -- CASE STUDIES After foundations have been completed, scheduling can be controlled by a single contractor working with a familiar material. Scheduling Control BACK FORWARD
- 7. TOTALLY PRECAST BRIDGES -- CASE STUDIES Precast concrete structural elements should always be plant produced under carefully controlled conditions…by plants that are Certified by PCI. Plant-produced Elements BACK FORWARD
- 8. TOTALLY PRECAST BRIDGES -- CASE STUDIES … so all structural elements benefit from the excellent quality and corrosion resistance of prestressed concrete. Quality and Corrosion Resistance BACK FORWARD
- 9. TOTALLY PRECAST BRIDGES -- CASE STUDIES Fully-cured precast concrete structural elements can be stockpiled in advance of need… Stockpiled in Advance BACK FORWARD
- 10. TOTALLY PRECAST BRIDGES -- CASE STUDIES …and can be scheduled for “just-in-time” delivery and erection… Immediate Delivery and Erection BACK FORWARD
- 11. TOTALLY PRECAST BRIDGES -- CASE STUDIES There’s no curing time required at the jobsite, as with cast-in-place concrete. Bridge piers can be erected in a day, and beams can follow immediately. No Curing Time BACK FORWARD
- 12. TOTALLY PRECAST BRIDGES -- CASE STUDIES The following photos illustrate the many products and construction methods that enable very rapid project completion. In addition to the oftenused superstructure elements of girders and deck slabs, substructure components such as these piers can also be precast. BACK FORWARD
- 13. TOTALLY PRECAST BRIDGES -- CASE STUDIES Precast concrete piles are quite popular in much of the country. They come in different sizes and shapes, ranging from 10inch square piles to 66inch diameter hollow cylinder piles. BACK FORWARD
- 14. TOTALLY PRECAST BRIDGES -- CASE STUDIES Pile caps also can be precast concrete, reducing exposure, forming and curing in the field. BACK FORWARD
- 15. TOTALLY PRECAST BRIDGES -- CASE STUDIES Piers can be made of precast concrete pieces quickly assembled in the field. BACK FORWARD
- 16. TOTALLY PRECAST BRIDGES -- CASE STUDIES Abutments can also be made of precast. BACK FORWARD
- 17. TOTALLY PRECAST BRIDGES -- CASE STUDIES The Sucker Creek Bridge in Hague, New York, consists of precast concrete box beams supported on precast concrete abutments assembled into a jointless, rigid frame. Sucker Creek Bridge in Hague BACK FORWARD
- 18. TOTALLY PRECAST BRIDGES -- CASE STUDIES In San Juan, Puerto Rico, the totally precast concrete Baldorioty de Castro Avenue bridges were built in recordsetting time, attractively, and economically. Puerto Rico MAIN BACK FORWARD
- 19. TOTALLY PRECAST BRIDGES -- CASE STUDIES Puerto Rico A totally precast bridge BACK Each of four bridges, ranging in length from 700 to 900 feet, was erected in about 24 hours. This was well within the owner’s construction allowance of 72 hours per bridge, a condition established to minimize disruption to one of the city’s highly traveled corridors. FORWARD
- 20. TOTALLY PRECAST BRIDGES -- CASE STUDIES In addition to speed, the bridges also met the city’s budgetary needs. The four box-beam bridges were constructed for $2 million less than the next lowest bid for another material. Puerto Rico BACK FORWARD
- 21. TOTALLY PRECAST BRIDGES -- CASE STUDIES Totally precast bridge systems may be the only viable solution in harsh field conditions. The Confederation Bridge connecting Canada’s Prince Edward Island to mainland New Brunswick is such an example. The bridge spanned the eight-mile-wide Northumberland strait, which experiences severe winters and is covered with ice floes for five months of the year. Confederation Bridge New Brunswick, Canada BACK FORWARD
- 22. TOTALLY PRECAST BRIDGES -- CASE STUDIES Even in such harsh conditions, precast concrete was able to meet the owner’s requirements of a 100-year service life, a 3½-year construction period, and attractiveness. Confederation Bridge BACK FORWARD
- 23. TOTALLY PRECAST BRIDGES -- CASE STUDIES It just makes economic sense to evaluate conversion of cast-inplace to precast concrete. This was done for the Edison Bridge in Florida. Precast piers and beams were spliced to produce tall pier bents. Edison Bridge Florida BACK FORWARD
- 24. TOTALLY PRECAST BRIDGES -- CASE STUDIES The state of Texas has constructed several bridges with segmental precast concrete piers. The attractive piers and pier caps are hollow members. Some are made of high-performance concrete. Such segments may be match-cast, similar to segmental box girder bridges, or separated by a thin mortar bed, much like giant masonry units. Texas - Precast Piers BACK FORWARD
- 25. TOTALLY PRECAST BRIDGES -- CASE STUDIES In Houston, the Louetta Road Overpass utilized precast concrete matchcast piers, as well as precast, prestressed Ubeams and stay-in-place deck panels. Louetta Road Bridge Texas BACK FORWARD
- 26. TOTALLY PRECAST BRIDGES -- CASE STUDIES Another famous bridge is the Sunshine Skyway Bridge over Tampa Bay in Florida. The piles, piers and pier caps were constructed of precast concrete elements connected together with post-tensioning threadbars. Sunshine Skyway Bridge Florida BACK FORWARD
- 27. Thank You for Your Attention BACK