Drilled Shaft Foundations for the CR #85 Bridge · Main bridge contract $1,522,000 Prestressed box...
Transcript of Drilled Shaft Foundations for the CR #85 Bridge · Main bridge contract $1,522,000 Prestressed box...
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Anthony J. Anthony J. BorrelliBorrelli, PE Stephen C. , PE Stephen C. CathermanCatherman, PE, PEBergmann AssociatesBergmann Associates Steuben County DPWSteuben County DPW
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Drilled Shaft Foundations for the CR #85 BridgeDrilled Shaft Foundations for the CR #85 Bridge
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Project Overview
Locally-Administered, Federal-Aid Project w/ NYSDOT Region 6
Owner: Steuben County Department of Public Works
Engineer: Bergmann Associates with:Tierney Geotechnical Engineering
SJB Drilling
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Project Overview (continued)
Contractor: The L.C. Whitford Company
Box Beam Supplier: Schuylkill Products
Construction Costs:
Main bridge contract $1,522,000Prestressed box beams $164,000Temporary bridge $342,000Total cost $2,028,000
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Site Overview
CR #85
NYS Rte 417
Tuscarora Creek Stats:121 sq mi drainage area18,000 cfs peak flow 14 fps max. velocity
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Project Timeline
9/11/04 – Bridge closed, detour set up
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Project Timeline
12/12/04 – Temporary bridge opens
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Project Timeline
6/1/05 – Construction begins
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Project Timeline
11/18/05 – New bridge opened
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Shaft Foundation Challenges:Construction diligence and expertise Specialized equipment Engineering expertise
Shaft Foundation ChallengesShaft Foundation Challenges::Construction diligence and expertise Construction diligence and expertise Specialized equipment Specialized equipment Engineering expertiseEngineering expertise
Shaft Foundation Advantages:Minimized shaft cap footprint Adaptable to varying geologyHigh lateral / axial capacity
Shaft Foundation AdvantagesShaft Foundation Advantages::Minimized shaft cap footprint Minimized shaft cap footprint Adaptable to varying geologyAdaptable to varying geologyHigh lateral / axial capacityHigh lateral / axial capacity
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Shaft Reinforcement
Rebar cages constructed on stands
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Hinged-Gate Details
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Shaft Concrete
Tremie tube
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Validation of CSL ResultsCSL testing should not be sole basis for shaft rejection – false results can occur
Inspector reports & drill logs
Compressive strength tests
Additional test methods:
Angled CSL testCross-hole tomographyCoring
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Defect Remediation Options
Refined analysis
Full scale load test
Abandon shaft & install new adjacent shaft
Install other adjacent foundation system
Structural grouting
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Footing Construction1:1.5 Slope
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Footing Construction
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Footing Reinforcement
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AbutmentConstruction
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AbutmentConstruction
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Box Beam Installation
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Deck Placement
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Finished Elevation
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Completed Bridge
Before After
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Lessons LearnedThe more subsurface information, the better
Specify a test shaft or installation sequence
Design with construction in mind
Careful contractor attention required for tremies
Engineer, inspector, contractor and owner must all understand shaft construction practices
Let the contractor select methods and equipment
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Types of Shaft DefectsBulge or neck in shaft
Non-homogeneous section: Sand lensSidewall cave-inVoids (esp. outside rebar cage)Excessive waterForeign materials
“Soft Toe”
Over consolidation
Off-location / out-of-plumb
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Correct flaws if present in >50% of the profiles
Correct defects if present in 2 or more profiles
False results:
Damaged / unbonded tubesGreen concreteTube alignment
Interpreting CSL Results
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Quality Control Measures
Tight specification with proper tolerances
Thorough review of contractor submittals
Trial or technique shafts (not part of final structure)
Test shaft (production shaft)
Knowledgeable personnel
Proper concrete placement practices
Integrity testing