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Construction Perspective

Explore advanced techniques and materials for bridge construction to enhance structural integrity and reduce project timelines. Topics include deck forming, overhang strategies, and machine utilization. Learn about cross frames, stay-in-place forms, and successful placing methods.

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Construction Perspective

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  1. Construction Perspective

  2. MAH-193-0028

  3. MAH-193-0028: • Spans: 5 (963’) • Girders: 84” Hybrids @ 11’-8” • Skew = 0°

  4. MAH-193-0028: • Frames: Slotted L4”x4”x½” • 3 piece and 4 piece • Expected Deflection during Pour = 10.67” • Frame Spacing: 24’

  5. Overhang from 4’ to 4’-3”

  6. MAH-193-0028:

  7. Cross Frame Cross Frame

  8. Cross Frames

  9. MAH-193-0028: • Structure was milled ¾” to 1 ¼” • Structure was given a 2”-3” microsilica overlay • Extra tall overhang brackets were used to dissipate web loading on the adjacent sister structure. Remedy:

  10. FAI-33-1417

  11. FAI-33-1417: • Spans: 3 (184’) • Beams: 45” Type III Prestressed Concrete • Skew = 23°

  12. FAI-33-1417: • Frames: Slotted MC 18x47.2 • Expected Deflection during Pour = 15/16” • Frame Spacing: 38’-10”

  13. Overhang = 4’-2 ½”

  14. FAI-33-1417: • The beam rotation also caused the deck to be thin and the resteel cover to be less than specified.

  15. FAI-33-1417: • Fascia bearings at piers were replaced and beveled shim plates were added to address translational rotation. Corrections Performed:

  16. Topics: • Typical Deck Forming • Typical Overhang Forming • Bridge Paving Machine • Use of Screed Elevations

  17. Deck Forming: Generic Interior Cross Section

  18. Hanger Strut Deck Forming: Falsework Between the Beams

  19. Edge Forms Soffit Hanger Haunch Deck Forming:

  20. Stay-in-place forms (SIP): • Corrugated, galvanized metal • Assume 18 psf for additional concrete

  21. Stay-in-place forms (SIP):

  22. Clip angle Stay-in-place forms (SIP):

  23. Haunch Styrofoam Stay-in-place forms (SIP):

  24. Topics: • Typical Deck Forming • Typical Overhang Forming • Bridge Paving Machine • Use of Screed Elevations

  25. Spacing is typically 2’-3’ • Typically no haunch • No SIP forms • Vertical leg length is currently determined by capacity of bracket only.

  26. Inspection Rail

  27. Overhang brackets can cause localized buckling and rotation of deep girders

  28. Std. Max = 50” Deep Max = 70”

  29. Topics: • Typical Deck Forming • Typical Overhang Forming • Bridge Paving Machine • Use of Screed Elevations

  30. Rail Rotating Rollers Augers Vibrating Rollers

  31. Bid-Well 3600 Max. Paving Width = 96’ Basic Machine = 5990 lbs. Additional = 53 lbs. / ft.

  32. 8’-7” Bid-Well 3600 Wheel Base = 3’

  33. Bid-Well 4800 Max. Paving Width = 120’ Basic Machine = 7600 lbs. Additional = 75 lbs. / ft.

  34. 11’-7” Bid-Well 4800 Wheel Base = 4’

  35. Bid-Well 4800 w/ 66” Deep Truss Max. Paving Width = 160’ Specialty Item – Do Not Use without Consulting OCA

  36. Deck Placement: • Contractor Typical Method of Placement

  37. Deck Placement: • Design Assumes Loading Along the Skew - OR -

  38. Deck Placement: • “Magical” Simultaneous Loading

  39. Deck Placement Going Forward: • Load and finish along skew (±5°) up to 50°. • Above 50°, finish at 50° and load at actual skew (±5°), but limit leading edge of concrete to 20’ ahead of bridge paving machine.

  40. Skew Width + Extra Machine Length = Width + Extra Length ┴ Calculating Bid-Well Machine Length: ┴

  41. Bid-Well Limitations: Connections

  42. Bid-Well Limitations: Break Must be an even truss dimension Crown Break

  43. Bid-Well Limitations: Break Must be an even truss dimension Crown Break

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