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 casings. It is used for crossing waterways, roadways, shore approaches, congested areas, environmentally 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 services.
