HDD offers the potential to install new or replacement pipelines, ducts and cabling without the need to excavate large pits and long trenches on the surface making the HDD process environmentally friendly compared to open cut techniques. Each project will require a significant amount of pre-project ground investigation to be carried out, planning and consultation with utility owners and contractors, machine manufacturers and support equipment providers such as drilling fluid removal (possibly specialist subcontractors) may be needed to best design the project parameters for a successful outcome. also needs to be assessed and provided to ensure that any bore proceeds as smoothly as possible. The correct tooling, support equipment etc. It is important to understand the ground conditions that will be encountered during the pilot boring and back-reaming operations, the length and diameter of the bores required in order to select the correct drilling rig for the job in hand. Ground conditions that can be drilled range from soft clays, sands and gravels to mixed grounds and hard rock depending on the equipment used. Lengths can be variable depending on the installation required and very importantly the ground conditions on site.īore lengths range from a few metres to over 1 km with diameters available from as little as 50 mm (2 in) to several hundreds of millimetres. Gravity networks may be possible also.Īpplications in gas, water, cable duct, rising sewer mains as well as gravity pipelines. New installation of pipes, cables, ducts mainly for pressure networks.
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