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LARGE DIAMETER DRILLED SHAFTSMarie Masters Fisk, P.E.
Table of contents
2
What is considered Large Diameter?
Use of Large Diameter under 2014 Spec
Why use?
Design & Construction Considerations
Control Measures
Example
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What is considered Large Diameter?
5’ dia or greater
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2014 Spec book use
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60" dia 66" dia 72" dia 78" dia 84" dia 92" dia 96" dia 108" dia 120" dia 132" dia 144" dia
32 7 14 3 12 2 8 3 7 1 2
2014 Spec book - # of time Bid Code has been used
Reasons to use Large Diameter DS?
Space
High Loads
Faster?
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Design Considerations
FD standard only goes up to 48” dia
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Construction Considerations
Cage
Install
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Control Measures
Thermal Integrity Profiler (TIP) testing – SS 4021
Item 405 – “Foundation Load Test.”
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Example TIP Results
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Example TIP Results
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When to use TIP testing?
Large diameter shafts
Mono-shafts
Shafts installed in water bearing sands (tricky
install)
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Load Test
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Statnamic Testing
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When to use Load Test?
When suspect deficient
When want to determine capacity
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Questions?
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