With this method, we can install pipelines of almost any material, with diameters ranging from 25mmØ – 1,200mmØ in distances from 15m – 1,500m installed in one single operation. It will reduce those costs enabling total project costs to be more feasible. As with most trenching operations the impact on local surroundings can be massive and extremely unpleasing whilst also bringing very high installation costs. This prevents the need for costly and inefficient trenching methods which are harmful to the environment and create massive amounts of waste materials. Horizontal Directional Drilling (HDD) causes no disruption to roads or rail, does not scar the landscape and works from the surface, meaning this trenchless method is suitable for environmentally sensitive areas. Horizontal Directional Drilling (HDD) or Horizontal boring as it sometimes known, provides a safe and cost effective solution for the installation of pipes, ducts and cables where conventional open cut methods are not permitted, practical or viable.
No reaming was required and the SDR11 125 diameter pipe was pulled directly into the drill hole. Due to lose ground the first 20 metres required the installation of a steel casing to support the drilling fluid. The direct route required the drill to run from one shallow valley, beneath a plateau covered by fields and woodland and exit in a steep sided valley at depths of up to 25m to 30m deep for the majority of the drill.īoreholes were carried out in advance to depths up to 40m, confirming that the ground was Upper Greensand Formation comprising weak to strong sandstones and siltstones.ĪWL utilised their 64te Midi Horizontal Directional Drill Rig complete with a 5 ½” mud motor and a PDC 7 7/8″ bit with a Tensor MGS probe.
Selborne situated in the South Downs National Park required a new 125 SDR11 rising main from the village pumping station to the refurbished STW.Ĭlient Thames Water explored various installation technique’s ranging from micro-tunnelling to open – cut but main contractor Cappagh Construction with engineering assistance provided by AWL designed an installation which could be under taken by Horizontal Directional Drilling.
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