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Jordan Creek Culvert Repair

Brian Gastrock P.E. Successful Sliplining of a 96-inch Diameter Culvert in Juneau, Alaska. Jordan Creek Culvert Repair. Project Characteristics. Change Order to Runway Safety Area Improvement Project 96-inch CMP Culvert Under Taxiway Alpha Conveys Jordan Creek Tidal Influence

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Jordan Creek Culvert Repair

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  1. Brian Gastrock P.E. Successful Sliplining of a 96-inch Diameter Culvert in Juneau, Alaska Jordan Creek Culvert Repair

  2. Project Characteristics • Change Order to Runway Safety Area Improvement Project • 96-inch CMP Culvert Under Taxiway Alpha • Conveys Jordan Creek • Tidal Influence • Slipline with 84-inch CAP • 120-feet, Centered Under Taxiway • Flow Control of Jordan Creek • 15 to 20 CFS, w/ 2-year storm of 80 CFS

  3. Construction Team • Alaska Interstate Construction LLC, Prime Contractor • Stephl Engineering LLC, Subcontractor/Engineer • Contech Engineered Solutions • Pipe Supplier • Mobile Concrete and Grout of Alaska, Subcontractor • Pacific International Grout, Subcontractor

  4. Project area Photo courtesy of Google earth

  5. Project area Photo courtesy of Google earth

  6. Project Purpose & Conditions • Severe Corrosion in Existing 96-inch CMP Culvert

  7. Project Purpose & Conditions • Complete Design and Construction in 2012 • May to August • Permit Stipulations, Anadromous Stream • Short-term Repair • 120-feet of the 220-feet Culvert Under Taxiway • 84-inch CAP Chosen • Short Lead Time • Structural Capacity • Corrosion Resistance

  8. Construction Key Elements • Field Visit to Determine Pipe Capable of Sliplining

  9. Construction Key Elements • Bypass Jordan Creek

  10. Construction Key Elements • Tidal Influence

  11. Construction Key Elements • Clean and Prepare the 96-inch CMP for Sliplining • 3-feet of Gravel and Soils in Invert • 50 CY of Material • Baffles to Remove • Water-stop Grout to Reduce Infiltration

  12. Pipe Cleaning • 3-feet of Soils and Gravel, Along with Baffles

  13. Pipe Cleaning • Cleaning Equipment

  14. Pipe Cleaning • Injection Grout to Reduce Infiltration

  15. Construction Key Elements • Pipe Delivery

  16. Construction Key Elements • Inflatable Plug to Hold Back Tides

  17. Construction Key Elements • Pipe Insertion Photo courtesy of AIC

  18. Construction Key Elements • Construct Bulkheads

  19. Construction Key Elements • Internal Joint Bands

  20. Construction Key Elements • Annular Space Grouting • Low Density Grout, 60 PCF • 3 Lifts

  21. Construction Key Elements • Annular Space Grouting

  22. Construction Hurdles • 2nd Grout Lift Separated Pipe from Grout

  23. Construction Hurdles • Rain Exceeded Bypass Pump Capacity

  24. Construction - Timing • Cleaning – 2 weeks • Baffles, Tides, Confined Space • Injection Grouting • Insert Pipe – 1 to 2 days • Prep for Grouting – 3 to 4 days • Bulkheads • Internal Bands • Grouting – 3 to 4 days • 1 Day for Each Lift

  25. Takeaways • Verify Host Pipe • Each Project is Unique • Blanket Specifications – Risky and Expensive • Flexibility During Construction • Cleaning • Annular Space Grouting • Bypass

  26. QUESTIONS? Brian Gastrock P.E. Jordan Creek Culvert Repair

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