Definition - What does Guided Boring mean?
Guided boring is a method for the installation of pipes, conduits and cables using a surface-launched drilling rig. A pilot bore is drilled using a rotating drill string and is then enlarged by a back reamer to the size required for the product pipe. Guided boring is used in a range of trenchless techniques like horizontal directional drilling (HDD) auger boring, and pipe ramming.
Guided boring is also referred to as mini-horizontal directional drilling.
Trenchlesspedia explains Guided Boring
The method of guided boring is highly pervasive in microtunneling and other forms of horizontal directional drilling (HDD).After the initial boring, the hole is expanded through use of a reamer to gradually enlarge the hole to allow installation of the product pipe. During drilling, the bit is laser guided allowing for a high degree of accuracy, often within 1 inch tolerances. Using guided boring is costly due to its use of highly specialized equipment and personnel. This maneuverability is facilitated by a slanted drill head, drill heads that are asymmetrical or movable fluid jets at the head.