HORIZONTAL DIRECTIONAL DRILLING (HDD)

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Directional drilling, commonly named horizontal directional drilling (HDD), is a steerable trenchless method of installing underground pipe, conduit or cable in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area. A directional drill bit mounted with an electronic transmitter can be driven to a designed alignment guiding by a receiver. After exit is reached, a suitable reamer can be used to draw back through the drilled hole and enlarge the hole to the entrance location. This method is suitable for laying HDPE pipes, small diameter mild steel pipes and etc.


HDD Process

Phase 1: Pilot Tube

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Phase 1: Entry of Pilot Steering Bit                                                                                                                        Phase 1: Exit of Pilot Steering Bit

Phase 2: Pre-Reaming
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Phase 3: Pull Back
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