Underground Pipelines Module #8 Prepared by Dr. Randy R. Rapp July 2005

2005, Randy R. Rapp2 Installation Methods Trenching and backfilling (cut and cover) –Traditional –Bedding can be critical Pipe jacking Horizontal directional drilling Slip lining Pipe bursting

2005, Randy R. Rapp3 Horizontal Directional Drill

2005, Randy R. Rapp4 HDD Reception Pit

2005, Randy R. Rapp5 Plastic Pipe PVC, PE, HDPE Protect joints –Solvents, thermal (PE, HDPE), or threads –Snaking –Bedding and backfilling –Flotation –No blocking –Expansion loops or joints –Supports

2005, Randy R. Rapp6 Vitreous Clay Pipe (VCP) National Clay Pipe Institute standards, p. 183; Table 8-2

2005, Randy R. Rapp7 Concrete Pipe Unreinforced RCP, Reinforced Concrete Pipe –Reinforcement patterns –Inspection and preparation –Laying and jointing –Bedding and backfill

2005, Randy R. Rapp8 RCCP (Reinforced Concrete Cylinder Pipe) and ML&C (Mortar-Lined and Coated Steel Pipe) Delivery, storage and handling Excavation and bedding Lifting and positioning Jointing Backfilling and compaction

2005, Randy R. Rapp9 Trenches Sheeting Subsidence Specifications Backfilling

2005, Randy R. Rapp10 Payment Station lengths, if specified Otherwise, slope length –Length placed before cutting, rounded up to nearest 2-ft increment –If centerline is skewed, use longer side –Include any “formed out” distance