Horizontal Directional Drilling

A method whereby underground services are installed without the need to disturb surfaces, structures or other pre-existing services.

The terms Horizontal Directional Drilling (HDD), Under-road Boring or Trenchless Installation, all refer to a method whereby underground services are installed without the need to disturb surfaces, structures or other pre-existing services. Directional boring is used for installing infrastructure such as telecommunications and power cable conduits, water lines, sewer lines, gas lines, oil lines, product pipelines, and environmental remediation cas- ings. It is used for crossing waterways, roadways, shore approaches, congested areas, en- vironmentally sensitive areas, and areas where other methods are costlier or not possible.

Collectively referred to as Trenchless Technology, this method entails the creation of an underground tunnel along a prescribed bore path which is large enough to accommodate whatever pipes, cables or conduits are required, and the subsequent installation of those ser- vices.

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