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Horizontal directional drilling and its application
Brian Harrison, Andre Wood
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Abstract
Extracted from text ... HORIZONTAL DIRECTIONAL DRILLING (HDD) is a construction procedure
that has been employed internationally for some 25 years. It
describes a specific form of trenchless technology that, by definition,
enables a variety of underground ducts and pipes to be installed with
minimum disruption to the ground surface. The technique combines
the steering technology developed in the oil industry with boring
methods employed for conventional horizontal trenchless crossings. It
requires little, if any, excavation to install pipes and conduits in a
range of lengths, sizes and depths along pre-assigned vertical and horizontal
alignments.
The technique has gained worldwide acceptance and is considered
an ..