The process is suitable for a variety of soil conditions including clay, silt, sand, and rock. Directional Boring/HDD can be utilized to cross any number of surface obstacles including roadways, railroads, wetlands, and water bodies of varying sizes/depths. Lastly, the pipeline is pulled into the enlarged hole, thus creating a continuous segment of pipe underground exposed only at the two initial endpoints. Next, the bore created during pilot hole drilling is enlarged to a diameter that will facilitate installation of the desired pipeline. First, a small diameter pilot hole is drilled along a directional path from one surface point to another. ĭirectional Boring/HDD is generally accomplished in three principal phases. Directional Boring/HDD can be utilized with various pipe materials such as PVC, polyethylene, polypropylene, ductile iron, and steel provided that the pipe's properties (wall thickness and material strength) enable it to be both installed and operated (if applicable) under acceptable stress limits. Directional boring and HDD are similar in some respects to directional drilling associated with the oil industry, however, an equal comparison cannot be drawn as the procedures serve markedly different functions. Generally, the term Horizontal Directional Drilling (HDD) is intended to describe large/maxi sized drilling rigs, large diameter bores, and crossing lengths in terms of thousands of feet. The term "Directional Boring" or "Bore" is generally reserved for mini/small sized drilling rigs, small diameter bores, and crossing lengths in terms of hundreds of feet. Īlthough often used interchangeably, the terms directional boring and horizontal directional drilling are distinct in that they convey a different sense of scale.
The technique is routinely used when conventional trenching or excavating is not practical or when minimal surface disturbance is required. Directional Boring/HDD offers significant environmental advantages over traditional cut and cover pipeline/utility installations. Method of installing underground utilitiesĭirectional boring, also referred to as horizontal directional drilling ( HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig.
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