Horizontal directional drilling (HDD)
Over the past few years, the horizontal directional drilling process has become well-established in the pipeline construction sector. The procedure was devised in the USA, and was originally created as an extension of the deep drilling technique during the 1970s. In pipeline construction, the horizontal directional drilling process has since become an established trenchless installation technique.
Drilling technology has developed at a rapid pace. The pipes are installed using a drill, without the need to dig trenches. Instead of the previous complex earth-moving work, a pilot drilling procedure is conducted; obstacles and changes of direction are no problem for the drill, which is equipped with a radio-controlled probe mounted on the drill head. This technology allows the engineers to precisely track, manage and control the drilling procedure. Once the pilot procedure is complete, the trenchless installation process begins. The engineers only need to dig at the start and end of the new pipeline.
Duktus holds the European record for HDD projects with ductile cast-iron pipes in size DN 900. In 2007, a DN 900 pipe section with BLS® joints and a cement-mortar coating was pulled into position on a site in Valencia (Spain) over a length of approximately 500 m.