Shaft Acceptance
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Shaft Acceptance WSDOT’s Perspective PowerPoint PPT Presentation


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Shaft Acceptance WSDOT’s Perspective. Mohammad Sheikhizadeh HQ Construction. Cross Sonic Log (CSL). Cross Sonic Log (CSL) Test. CSL Sensor. Types of Anomalies. Anomalies in the Perimeter of Shaft No Concrete Cover Anomalies in the Center of Shaft Soft Bottom

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Shaft Acceptance WSDOT’s Perspective

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Presentation Transcript


Shaft Acceptance

WSDOT’s Perspective

Mohammad Sheikhizadeh

HQ Construction


Cross Sonic Log (CSL)


Cross Sonic Log (CSL) Test


CSL Sensor


Types of Anomalies

  • Anomalies in the Perimeter of Shaft

  • No Concrete Cover

  • Anomalies in the Center of Shaft

  • Soft Bottom

  • Poor Concrete in The Top of Shaft


Further Investigation

  • The Contractor Proposes Additional

  • Exploratory Measures

  • The Engineer Approves or Suggests an

  • Alternate Proposal


WSDOT Evaluation

  • Review Boring Logs

  • Geotechnical Engineer’s Input

  • Review Inspector’s Field Notes/Input

  • Review Mix design, Slump, Cylinder

  • Breaks

  • Structural Analysis/Acceptance


Shaft Design


Additional CSL Test


Defect in the Middle


8’ Diam. Shaft With 4’ Hollow Core

8’

6% Loss in Flexural Capacity


Perimeter Defect


Concrete Cover


Defect at Top of Shaft


Soft Bottom


Tip Pressure Grouting

Pressure Grout

2” diam. Core

CSL Tubes May Be Used

For Grouting


Shaft Rebar Cage


Concluding Remarks

  • CSL Tests & Results Are Accurate &

  • Dependable Provided:

  • Tests Performed by Skilled Testers

  • Correct Interpretations Are Made


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