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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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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 • 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
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
Project area Photo courtesy of Google earth
Project area Photo courtesy of Google earth
Project Purpose & Conditions • Severe Corrosion in Existing 96-inch CMP Culvert
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
Construction Key Elements • Field Visit to Determine Pipe Capable of Sliplining
Construction Key Elements • Bypass Jordan Creek
Construction Key Elements • Tidal Influence
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
Pipe Cleaning • 3-feet of Soils and Gravel, Along with Baffles
Pipe Cleaning • Cleaning Equipment
Pipe Cleaning • Injection Grout to Reduce Infiltration
Construction Key Elements • Pipe Delivery
Construction Key Elements • Inflatable Plug to Hold Back Tides
Construction Key Elements • Pipe Insertion Photo courtesy of AIC
Construction Key Elements • Construct Bulkheads
Construction Key Elements • Internal Joint Bands
Construction Key Elements • Annular Space Grouting • Low Density Grout, 60 PCF • 3 Lifts
Construction Key Elements • Annular Space Grouting
Construction Hurdles • 2nd Grout Lift Separated Pipe from Grout
Construction Hurdles • Rain Exceeded Bypass Pump Capacity
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
Takeaways • Verify Host Pipe • Each Project is Unique • Blanket Specifications – Risky and Expensive • Flexibility During Construction • Cleaning • Annular Space Grouting • Bypass
QUESTIONS? Brian Gastrock P.E. Jordan Creek Culvert Repair