This expansion process can be completed in stages depending on how large the product pipe/cable is, normally the final diameter of the bore is between 30-50% larger than the product pipe/cable that is to be installed. Once completed to the satisfaction of the client, this pilot bore is then expanded as necessary using various sizes and types of back-reamers to enlarge the pilot bore to the final diameter into which the product pipe or cable will be installed. HDD is a multi-phase operation which uses a special design drilling rig which initially bores a pilot hole through the ground along a pre-determined route. HDD is one of the most versatile trenchless methods used for the installation of many product pipelines including service connections, mains pipes, cables, crossings under highways, rail tracks, watercourses, runways, landfill sites etc. The installation, when correctly planned and using the right equipment, can install networks from small to large diameters over a short to long distances safely and with minimal disruption to the surroundings, local businesses and the general public can carry on with their daily business at a lower cost compared with traditional methods when all aspects of the traditional operations are taken into account (including site waste disposal traffic management, possible compensation claims etc.) 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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