Horizontal Directional Drilling
Horizontal Directional Drilling (HHD) and other trenchless technologies are steadily replacing traditional open-cut excavation methods. Horizontal directional drilling enables the efficient installation of underground utilities, such as pipes and cables, in areas where conventional trenching is impractical. By creating precise subsurface bore paths, HDD minimizes public disruption and reduces the risk of damage to existing infrastructure and natural resources.​
A surface-mounted directional drilling rig is used to push, rotate, and pull steel drilling rods along a predetermined bore path—from the drilling rig to an exit pit. Once the drill string reaches the target location, the steering head is removed and replaced with a hole opener (reamer). The conduit or pipeline is then attached behind the reamer via a swivel, allowing for seamless installation.
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Unlike traditional drilling methods, directional drilling offers greater control over entry points and horizontal direction. This flexibility enables access to multiple target locations from a single entry, making it possible to install underground utilities in areas that would otherwise be inaccessible. Unlike trenching, which involves excavating from the surface, HDD creates underground tunnels without disturbing the soil above.
Key benefits of HDD
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Minimal Public Disruption
Large-scale excavation often causes significant disturbances. With HDD, drilling rigs can be positioned away from high-traffic areas, reducing the impact on public life, traffic, and safety. -
Enhanced Safety
Traditional open-pit excavation poses risks such as accidental falls and trench collapses. HDD eliminates these hazards, ensuring a safer working environment for both workers and the public. -
Reduced Soil Disturbance
Directional drilling allows for precise pilot boreholes and controlled bore paths, minimizing soil displacement. Experienced professionals can carefully plan and execute bore paths to reduce environmental impact. -
Multiple Installations from One Location
A single HDD entry point can be used to install multiple utilities, reducing surface damage and optimizing project costs. This efficiency is particularly beneficial for urban and environmentally sensitive areas. -
Lower Excavation and Shoring Costs
Since HDD does not require trench excavation, it significantly reduces construction and shoring expenses. The absence of open trenches also eliminates the need for extensive reinforcement to prevent collapses. -
Weather-Resistant Operations
Traditional trenching projects are often delayed due to adverse weather conditions, such as heavy rain, which can destabilize trench walls. In contrast, HDD operations remain largely unaffected by weather, ensuring project timelines stay on track.
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OCL's HDD solutions offer a safer, more efficient, and environmentally friendly alternative to conventional excavation, directional drilling continues to transform underground infrastructure development.
