Anthony J. Anthony J. Borrelli Borrelli , PE Stephen C. , PE Stephen C. Catherman Catherman , PE , PE Bergmann Associates Bergmann Associates Steuben County DPW Steuben County DPW Presented By: Drilled Shaft Foundations for the CR #85 Bridge Drilled Shaft Foundations for the CR #85 Bridge
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Drilled Shaft Foundations for the CR #85 Bridge · Main bridge contract $1,522,000 Prestressed box beams $164,000 Temporary bridge $342,000 ... 6/1/05 – Construction begins. Project
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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
Presented By:
Drilled Shaft Foundations for the CR #85 BridgeDrilled Shaft Foundations for the CR #85 Bridge
Project Overview
Locally-Administered, Federal-Aid Project w/ NYSDOT Region 6
Tuscarora Creek Stats:121 sq mi drainage area18,000 cfs peak flow 14 fps max. velocity
Project Timeline
9/11/04 – Bridge closed, detour set up
Project Timeline
12/12/04 – Temporary bridge opens
Project Timeline
6/1/05 – Construction begins
Project Timeline
11/18/05 – New bridge opened
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
Shaft Reinforcement
Rebar cages constructed on stands
Hinged-Gate Details
Shaft Concrete
Tremie tube
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
Defect Remediation Options
Refined analysis
Full scale load test
Abandon shaft & install new adjacent shaft
Install other adjacent foundation system
Structural grouting
Footing Construction1:1.5 Slope
Footing Construction
Footing Reinforcement
AbutmentConstruction
AbutmentConstruction
Box Beam Installation
Deck Placement
Finished Elevation
Completed Bridge
Before After
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