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  NASTT's 2012 Introduction to Trenchless Technology Short Course New Installation Pt 1 Session 3


HORIZONTAL DIRECTIONAL DRILLING (HDD) is a steerable trenchless construction system for the installation of pipes, conduits and cables in a shallow arc using a surface launched drilling rig. Traditionally, the term applies to large scale crossings of waterways or highways in which a fluid-filled pilot bore is drilled and is then enlarged by back reaming to the size required for the new inserted product piping.  This trenchless methodology has been successful used for installations of 700 to 7,500 feet depending on the size of the drilling rig and the site conditions.

MICROTUNNELING is a trenchless construction method for installing pipelines by remote control or steerable laser controlled evacuation tunneling.  Developed in the 1970's, Microtunneling uses a microtunnel boring machine (MTBM) which is operated from the surface without operator entry.  Piping is simultaneously installed as spoil is excavated and removed.  The laser guidance system can usually achieve the high degrees of accuracy required for gravity sewer line and grade.  Microtunneling machines are readily available to drive approximately 3,000 feet.

PIPE JACKING is a trenchless construction method usually applied to the smaller diameter of microtunneling.  Hydraulic jacks are utilized to push specially designed piping from as excavation is occurring.  The finished product is a watertight and structural sound pipe usually with short lengths and with specialized joints.  A cost effective alternative to traditional excavation, Pipe Jacking is most often used for tunneling under highways or railways.

Sponsored by: NASTT


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