Module 4 - Pier Rehabilitation Design and Construction
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Travis Butz, PE, Burgess & Niple Module 4: Pier Rehabilitation Design and Construction ABC-UTC In-Depth Web Training Milton Madison Bridge Replacement: the Mega-Lateral Slide Existing Bridge 2 Milton, KY Madison, IN Proposed Bridge Pier 2 Pier 3 Pier 4 Pier 5 Pier 6 600’ 600’ 727’-3” 500’ New Pier Cap Strengthen Existing Pier New Pier 254’ 150’ Pier 9 Pier 8 Pier 7 Pier 6 Pier 4 600’ 600’ 727’-3” Pier 5 Typical Existing River Piers 3 20’ Water 60’ Soil Un-reinforced Caisson Un-reinforced Rock Socket 1.7’-6.7’ deep Existing Pier stem reinforcing extends 12’ into caisson Boulders
Transcript of Module 4 - Pier Rehabilitation Design and Construction
Travis Butz, PE, Burgess & Niple
Module 4: Pier Rehabilitation
Design and Construction
ABC-UTC In-Depth Web TrainingMilton Madison Bridge Replacement: the Mega-Lateral Slide
Existing Bridge
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Milton, KY Madison, IN
Proposed Bridge
Pier 2
Pier 3
Pier 4
Pier 5
Pier 6
600’ 600’ 727’-3” 500’
New Pier Cap
Strengthen Existing Pier
New Pier
254’ 150’
Pier 9
Pier 8
Pier 7
Pier 6
Pier 4
600’ 600’ 727’-3” Pier 5
Typical Existing River Piers
3
20’ Water
60’ Soil
Un-reinforced Caisson
Un-reinforced Rock Socket 1.7’-6.7’ deep
Existing Pier stem reinforcing extends 12’ into caisson
Boulders
4
Proposed Pier Strengthening
1. Drill holes into existing
unreinforced caisson
2. Grout Rebar into Caisson
3. Add Stem Reinforcement
4. 2’ thick encapsulation
5. Pier Cap Reinforcement
6. Form and Cast new Pier
cap
Existing Pier and Caisson
SECTION A-A
A A
Design Concept:
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Pier Construction Sequence
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Pier Construction Sequence
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Pier Construction Sequence
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Pier Construction Sequence
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Pier Construction Sequence
11/10/201511
Sliding
Truss Sliding
Pulling
Truss Sliding
Truss Sliding
Truss Sliding
Truss Sliding
FE Analysis of Pier Foundations
FE Analysis of Pier Foundations
FE Analysis of Pier Foundations
FE Analysis of Pier Foundations
FE Analysis of Pier Foundations
Strength Analysis of Caissons & Stem
Pier Cofferdams Installed
Exposed Caisson
Exposed Caisson
Coring Operation
Holes extended up to 71’-7” below the top surface of the caisson
Coring Operation
Caisson Reinforcement
Bundles of 3-#14 Bars
Grouting:
Grout tubes installed with bars. Grout injected from the bottom up.
Grouting:
- Revealed that holes were interconnected
- Raised concerns about voids within the caissons
Pier Construction Method:
Caisson Voids:
Caisson Voids:
Caisson Void Resolution:
- Grouting procedure altered in an attempt to assure all connected voids are filled.
- Test holes were cored after grouting was complete to verify that no voids were discovered.
Pier Stem Shear Connectors:
Stem Reinforcement
Sliding GirderPedestal Bars
Tighter spacingnear top of stem
Stem Complete
TemporaryPier in Place
Sliding Girder PedestalReinforcement:
New Pier Caps
New Pier Caps
Truss Sliding
Final Condition
• Expect the unexpected when you are rehabilitating an existing bridge.
• Anticipating potential problems during design can make things easier during construction.
• Be flexible in finding solutions for problems in the field.
Lessons Learned:
Questions?
Thanks to the following for photos and other material included in this presentation :
• Walsh Construction• Charlie Gannon• Deborah Crawford (Milton Madison Facebook page)• Michael Baker, Inc.• Buckland and Taylor
