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Pilot Tube Auger Boring

The Pilot Tube Method, also known as the Guided Boring Method is a hybrid technique that combines the characteristics of other trenchless methods to accurately install casing on line and grade.

Typical Application:

For the trenchless installation of utilities under roadways, freeways, railroad tracks, canals and existing utilities or structures that cannot be open cut.

Description:

This technology uses a two-phase process to complete the casing installation.  First, a steering head followed by pilot tubes are pushed into the ground, steered using a theodolite guidance system that allows installation on precise line and grade.  Following this pilot bore, a special cutting head followed by auger is hooked to the pilot tube using an adapter and the casing is installed using traditional auger boring, following the path of the pilot tube.  As the casing and auger advance, the pilot tube is pushed out into the reception pit where it is broken down and removed. 

Considerations:

  • Casing size ideally 16” – 36”, potential to go larger depending on soil conditions
  • Lengths up to 400’
  • More successful in softer soils but can use a bit to adapt to harder soils
  • Not ideal in rock or cobble conditions
  • Limited to 400’ and under due to the guidance system capacity
  • Requires a 14’ x 40’ launch pit and a 10’ x 20’ receiving pit
  • Sizing up beyond 36” requires sacrificial casing to allow gradual sizing up

 

 

 

As industry experts in Trenchless Technology and non-destructive Air & Hydro Excavation, we can provide the most effective solution for your underground construction project. Please contact us today and speak to us about your next project!

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