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Post Installation Pipe Inspection

Post Installation Pipe Inspection. Prepared for KYTC Section Engineers Meeting March 5, 2013 By Kean H. Ashurst Jr., P.E. Kentucky Transportation Center. Overview. More structured and standardized reporting format Different technologies for laser deflection testing What to look out for

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Post Installation Pipe Inspection

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  1. Post Installation Pipe Inspection Prepared for KYTC Section Engineers Meeting March 5, 2013 By Kean H. Ashurst Jr., P.E. Kentucky Transportation Center

  2. Overview • More structured and standardized reporting format • Different technologies for laser deflection testing • What to look out for • Certification Program

  3. Video Inspection Summary Report

  4. Video Inspection Report - Individual Pipe

  5. Deflection Inspection Summary Report

  6. Deflection Inspection Report - Individual Pipe

  7. Different Technologies • Video inspection • Laser inspection • 2 different technologies in use in KY • Rausch (spinning laser head) • Cues (laser ring) • Both use laser light to measure off a picture • Not time of flight laser measuring

  8. What to look out for • All deflection measurements should be based off of AASHTO nominal diameter • The last 5 to 12 feet of all laser inspections are always missing • Rausch unit is consistent • Cues unit will vary • Maximum scanning speed should not exceed 30 ft/min

  9. What to look out for • Rausch (spinning laser head) • As pull back speed increases the gap between identical points increases • Rausch - Single point scans • Whole run scan vs. single point scan • Single point scan is more accurate • Rausch - Unit has to be centered in pipe

  10. What to look out for • Calibration is critical for the Cues system • Pipe is “racked” • Can control rather than horizontal/vertical • Cues has an ovality report • Rausch has a wireframe diagram • If you can see deflections then most likely the pipe is over deflected

  11. Cues H/V Profile

  12. Rausch Single Point Scan Footage Horizontal Deviation Vertical Deviation Reference Ring Scanned Profile Width Average diameter for this “slice” Nominal Diameter

  13. Rausch Wireframe Diagram Color Deflection Limits Red/Black > 5.7% Yellow/Brown >2.1% Diameter, deformation & deflection % Distance in pipe

  14. Max Deflection Not in H/V

  15. Rausch Vertical Profile

  16. Rausch Vertical Profile

  17. Rausch Vertical Profile

  18. Cues Profile

  19. Certification Program • Post installation pipe certification program • Test track • 3 materials (RCP, CMP, HDPE) • Distressed pipe • Show they can complete form • Adequately identify distresses and deflections • Operator certified for their equipment

  20. Thank You Kean H. Ashurst Jr., P.E. Kentucky Transportation Center University of Kentucky 176 Raymond Building Lexington, KY 40506 (859) 257-7319 kean.ashurst@uky.edu

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