Guided Pipe Reaming
Guided Pipe Reaming is a trenchless method by which a pipeline is pulled into the ground after a pilot tube is installed on line and grade. This method is similar to Horizontal Directional Drilling (HDD), however instead on installing pilot rods from the surface and following a shallow arc that is suitable for pressure lines and electrical utilities, Guided Pipe Reaming is a pit launch application that installs pilot rods on line and grade without the requirement of oversized pullback reamers.
- Environmentally Friendly: Guided Pipe Reaming does not use high volumes of bentonite slurry to flush cuttings and potentially cause surface frac-out.
- Accuracy: The pilot tube installation ensures line and grade accuracy. Pull-back reamers used have nominal overcut diameters typically used in the gravity flow sewer industry.
- Cost Reduction: Alternative pipe materials can be considered based on project requirements and geotechnical conditions.
- HDD Assist: Pilot tubes can be used to guide horizontal directional drill stems along a critical section of the alignment that requires exact line and grade control during large HDD projects.
- Pilot tubes are accurately installed from the launch shaft to the receiving shaft with tooling selected based on the ground conditions encountered.
- Depending on the product pipe diameter and ground conditions, multiple options may be available for the second step.
- For product pipe similar in diameter to the installed pilot tubes, a pull-swivel and reamer or displacement tool are connected to the product pipe and installed directly on line and grade.
The Port Mann/ Highway 1 Improvement Project (PMH1) was executed as a design-build project. Its purpose was to mitigate traffic congestion, improve safety for vehicles and pedestrians, improve environmental habitat, and re-implement public transit in greater Vancouver.