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Bridges precast

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Bridges precast

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Bridges precast

  1. 1. Dr f Dejahang (BSc CEng, BSc (Hons) Construction Mgmt, MSc,MCIOB,PhD)   017 PRECAST BRIDGES http://www.cpi-team.com
  2. 2. Science Art Religion Politics Scholarly Articles For Mathematics and Productivity http://www.twitlonger.com/show/n_1sp9pjo?new_post=true MICROSOFT OneDrive PPT’s PDF’s BOOK LESSONS Dr f Dejahang BSc CEng, BSc (Hons) Construction Mgmt, MSc, PhD
  3. 3. PRECAST BRIDGES ABC Precast Concrete County Bridge Construction - YouTube.htm construction of bridge - YouTube.htm Bridge-arch installation 02.VOB - YouTube.htm Bridge-Construction - Macrete FlexiArch Bridge System - YouTube.htm
  4. 4. PRECAST CONCERTE BRIDGES Low Initial Cost Precast prestressed concrete bridges are usually lower in first cost than other types of bridges. Savings in maintenance, precast bridges offer maximum economy.
  5. 5. PRECAST CONCERTE BRIDGES Minimum Maintenance The overall economy of a structure is measured in terms of life-cycle costs. These include the initial cost of the structure plus the total expected maintenance costs. The lifetime cost of repainting steel bridges can amount to 10 to 20% of the original cost of the original cost of the bridge.
  6. 6. PRECAST CONCRETE BRIDGES
  7. 7. PRECAST CONCERTE BRIDGES
  8. 8. PRECAST CONCERTE BRIDGES Precast prestressed concrete bridges built in accordance with provincial government requirements should require very little if any maintenance. They are constructed using high quality materials to exacting manufacturing tolerances. Fatigue problems are minimal because traffic loads induce only minor stresses.
  9. 9. PRECAST CONCERTE BRIDGES Fast Easy Construction Precast prestressed bridge girders require minimal lead times because they are locally manufactured in standard shapes and sizes. The precast components are easy to erect in any weather. Simple connections join the deck girders to the substructure.
  10. 10. PRECAST CONCERTE BRIDGES Formwork for the superstructure can be eliminated when the tops of girders are placed together to form the entire deck slab.
  11. 11. PRECAST CONCERTE BRIDGES Ties between adjacent units often consist of a grouted keyway and welded or transverse post-tensioned connections.
  12. 12. PRECAST CONCERTE BRIDGES For logging or low volume secondary roads, traffic can run directly on the girder deck.
  13. 13. PRECAST CONCERTE BRIDGES Carefully planned details will speed the construction process and save money. Minimum Traffic Interruption Maintaining traffic and eliminating detours are difficult problems for bridge owners. Precast prestressed concrete integral deck bridges can minimize traffic interruption This is because of the availability of long span, plant- produced sections and the speed of erecting a bridge
  14. 14. PRECAST CONCERTE BRIDGES In emergencies, precast girders can be rush ordered and a bridge reopened in a matter of days or weeks using standard components.
  15. 15. PRECAST CONCERTE BRIDGES
  16. 16. PRECAST CONCERTE BRIDGES Simple span precast bridge deck girders can be pinned to the abutments to resist horizontal earth pressures Or designed as integral abutments to eliminate troublesome expansion joints Multi-span bridges can be made continuous for a smoother ride and to reduce the number of expansion joints
  17. 17. Minimum Span/Depth Ratio
  18. 18. PRECAST CONCERTE BRIDGES
  19. 19. Assured Plant Quality
  20. 20. Assured Plant Quality
  21. 21. Assured Plant Quality
  22. 22. Durable
  23. 23. Durable
  24. 24. Durable
  25. 25. PRECAST BRIDGES
  26. 26. PRECAST BRIDGES
  27. 27. PRECAST BRIDGES
  28. 28. PRECAST BRIDGES
  29. 29. PRECAST CONCERTE BRIDGES
  30. 30. Precast concrete structural elements Factory site
  31. 31. PRECAST CONCERTE BRIDGES
  32. 32. PRECAST CONCERTE BRIDGES
  33. 33. Stockpiled in Advance PRECAST BRIDGES
  34. 34. PRECAST BRIDGES
  35. 35. Supply and Chain- Just-In-Time PRECAST BRIDGES
  36. 36. PRECAST BRIDGES
  37. 37. PRECAST BRIDGES
  38. 38. PRECAST CONCERTE BRIDGES
  39. 39. PRECAST CONCERTE BRIDGES
  40. 40. PRECAST CONCERTE BRIDGES
  41. 41. PRECAST CONCERTE BRIDGES
  42. 42. PRECAST BRIDGES PRECAST BRIDGES
  43. 43. Piers can be made of precast concrete pieces quickly assembled in the field.
  44. 44. PRECAST CONCERTE BRIDGES Attractive Precast prestressed concrete bridges can be designed to elegantly blend harmoniously with their surroundings It can offer an attractive view from above, beside and below. Strong Tough Durable Can be constructed using the low depth/span ratios possible using high strength precast prestressed concrete and the simple clean shapes of locally available sections.
  45. 45. Bridge deck erection gantries for pre-cast concrete viaducts
  46. 46. Bridge deck erection gantries for pre-cast concrete viaducts Concrete bridge deck erection gantry Picture shows one of the self launching bridge deck erection gantry for erection of precast concrete segments on the 75m approach spans Used for Sutong cable stayed bridge The gantry was designed to handle precast concrete segments weighing up to 160 tonnes each
  47. 47. Bridge deck erection gantries for pre-cast concrete viaducts which were erected by the balanced cantilever method and to suspend a half span of segments adjacent to deck movement joints weighing up to 1100 tonnes. The gantry was designed to handle deck longitudinal gradients of +/- 3%, deck plan minimum curvature of 950m and to skid sideways to erect adjacent box girders.

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