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INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS

INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS. Ornulv (Arnie) Sonsteby, PE & Doron Lean. Penn State / FAA Airport Conference 2007. IPRF-03-1 Project. Best Practices Guide for In-Pavement Lighting, PCC Pavement . Estimated Completion: 2007

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INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS

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  1. INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS Ornulv (Arnie) Sonsteby, PE & Doron Lean Penn State / FAA Airport Conference 2007

  2. IPRF-03-1 Project Best Practices Guide for In-Pavement Lighting, PCC Pavement Estimated Completion:2007 PI & Contact:Ornulv (Arnie) Sonsteby, P.E. email:osonsteby@burns-group.com Sponsored by:FAA, in Cooperative Agreement with Innovative Pavement Research Foundation (IPRF)

  3. GUIDE CONTENT • Coordination between disciplines • Installation in new vs. existing PCC • Products, methods, tolerances • Boxouts / blockouts • Deficiencies and corrective alternatives • Strength and load transfer

  4. Preparing Light Base & Jig

  5. Light Base Installation • “Anchor” function (preparation for paving) • (b) “Strengthening” function (completed installation)

  6. INSTALLATION ISSUES • Coordination between disciplines • Selecting: • Methods & procedures • lighting products • Pavement materials • Tolerances & verification

  7. CCOORDINATION IN DESIGN • Light location vs. pavement joints • Materials and method • QC/QA • Tolerances and Consequences

  8. PCC JOINT CONFLICTS • Touch Down Zone Lights • Lead-off / Lead-on TW CTL Lights • TW CTL Lights at curves / intersections • In-pavement RGL / Stop Bar Lights

  9. MATERIALS & METHODS • Light Base, Conduit, Pavement materials • Installation procedures and “structure” -- in new or existing pavement • Surface finish (“cookie cutter” vs. Core)

  10. QC / QA The quality of installation depends on: • Good design by engineer • Good craftsmanship by installer • Close coordination between disciplines • Inspection / verification of compliance

  11. Tolerances and Consequences • Pavement vs. Base tolerances • Light Base: Location, Height, Azimuth, Level • When to modify, when to replace

  12. Light Tolerances Location:Per AC. Depends on type and function of light. Height:Fixture edge even with pavement, (low side): +0”, -1/16. Azimuth:Within ± ½ degree. Level:With horizon. No tolerance specified. ** Paving elevation tolerance -- + ½”

  13. Level Tolerance? • Pavement has longitudinal grade & cross slope (up to 1.5% major R/Ws) • No tolerance in AC. Engineer may establish tolerance (varies) • Tolerance applied in wrong direction worsens condition • Consider 

  14. Ht D Ht D Deg Grade for 12” for 6” O 1/2 0.9% 0.1” 0.05” O 1 1.75% 0.2” 0.1” Level !! TRANSVERSE SLOPE LONGITUDINAL GRADE

  15. COORDINATION IN CONSTRUCTION • Survey • Materials and method • QC/QA • Tolerances and Consequences

  16. Survey • Coordinate survey activities • Survey to: • Locate light • Install light base • Verify before paving

  17. Selecting Materials & Methods • Submittals review for compliance • Establish installation sequence and responsibilities • Inspection --- more inspection • Protect lights while completing paving

  18. Light base Conduit in pavement base layer Setting base “in space”

  19. Setting bases in “fill-in” lane

  20. Installation in existing PCC Pavement RW Edge Light, Toe-In

  21. QC / QA • Verify light location • Verify height, azimuth & level while securing light base • Check tolerances prior to paving • Inspect surface finish • Protect light while paving, grooving, sweeping, and marking

  22. 2’ from Joint Issue • AC 150/5340-30 R/W CTL: “The line of lights is offset a maximum of 2’ from the runway centerline to the edge of fixture.” T/W CTL: “Fixtures should be installed so that their nearest edge is approximately 2’ from any rigid pavement joint.” • Modeling: (by Tigerbrain)

  23. σ - bottom of 18” thick 20’x20’ slab B-777 (254K edge loading).

  24. σ - top of 18” thick 20’x20’ slab B-727 (corner loading).

  25. Joint Issue Comments • Pavement Design is conservative (edge stress, no load transfer). • Modeling (with no load transfer between slabs, no bonding to underlying layer): • Dowels generally reduced max edge stress by ~ 20%. • With 2 dowels omitted, max edge stress reduced by ~ 12%.

  26. (Joint Issue Comments continued) • Hence: Inside 2’, with 1 or 2 dowels omitted has minimal impact on slab-slab load transfer. • Load transfer between light base and pavement – assessment suggests non-issue. • Embedded steel can help control cracking close to joint. • Alternative: Boxout

  27. PCC Joints 7” Light base 18” Light near PCC joint

  28. Details, details !! PCC Joint Cracks In-Pavement Light Conduit Kerf

  29. T/W CTL Light Boxout at PCC joint

  30. Normal joints Crack Doweled joint for Boxout Boxout at PCC joints !

  31. Threshold Light Bar “boxout”

  32. A few Related concerns

  33. KERFS PCC Joint Maintain existing pavement joints - for full section of kerf !

  34. Conduit below !! Longitudinal crack center T/W slab T/W Centerline Light

  35. Faulty sealing

  36. Fate of out-of-tolerance light bases!

  37. Doron

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