2013 Section Engineer’s Meeting.  Correct Type, Gauge, and Coating (Standard Drawings)  Based on Pipe Diameter, Fill Height & Soil pH  Obtain copy.

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Presentation transcript:

2013 Section Engineer’s Meeting

 Correct Type, Gauge, and Coating (Standard Drawings)  Based on Pipe Diameter, Fill Height & Soil pH  Obtain copy of Manufacturer’s Handling and Installation procedures  Pipe Condition  Defects to look for are different for each type of pipe (RCP, CMP, PVC…etc.)

 Check Staking  Correct Station  Inlet/Outlet Elevations  Ensure proper grade.  Pipe Pads/Trench Condition  Excavation  Pipe Undercut if Rock or Soft Foundation  Price is in Spec Book

 Joints  Construct per Spec depending on Type of Pipe  54” and greater must be wrapped with Type IV Fabric – 3’ min width  Bedding and Fabric  Use No. 8 or 9-M aggregate for bedding  Excavate a cradle for pipe and check with template  Use Type IV Fabric when backfill and surrounding conditions are different gradations, at $2 / sq yd

 Backfill and Compaction  Granular Backfill in Trench  Flowable Fill –if under existing road or within one pipe diameter of subgrade  Construction Loads – 48 Inches min depth needed  Monitor Pipe During Construction “Too much emphasis cannot be placed on the necessity of adequate compaction of backfill. Faulty compaction has led to more trouble with pipe installations, flexible and rigid, than all other factors combined!” NCSPA

 Safety  OSHA Standards  Proper Erosion Control

 Pipeline Video Inspection (> 250 LF of Pipe and ADT > 1,000)  Conduct camera/video inspections in accordance with KM on 100 percent of the pipes that are located under the road and 50 percent of the pipes that are not under the road.  Schedule the inspections no sooner than 30 days after completing the installation and completion of earthwork to within 1 foot of the finished subgrade.

 Crack Testing for Rigid Pipe  < or = 0.1 inch – 100% Pay  > 0.1 inch - Remediate or Replace  Deflection Testing for Flexible Pipe  0.0 to 5% - 100% Pay  5.1 to 7.5% - 75% Pay  7.6 to 9.9% - 50% Pay  10% or greater – Remove and Replace  Note: Structural Analysis to be provided if over 5%