Horizontal Directional Drilling (HDD) is cost effective trenchless method to install underground utilities/pipes or soil remediation lines with little or no surface disruption.
This technology is ideal for environmentally sensitive areas, golf courses, airport runways, railroads, water ways, busy roadways, residential & commercial areas or where it is difficult or impossible to use conventional trenching. Directional Drilling can be done in all types of soil, dirt, sand, clay, gravel, cobble, glacial till, shale and rock.
HDD begins from the surface at an entry angle between 5 and 20 degrees and is tracked along a predetermined path with a locating system. The drill string is accurately directed toward a horizontal target depth and the final exit point. Once the drill string reaches the exit location or surface a back reamer is attached to the drill string and pulled back to the entry point. This process enlarges the borehole for the installation of the utility/pipe. To achieve the appropriate bore size it may be necessary to perform several back reaming operations. The utility/pipe is pulled back once the borehole is enlarged to the appropriate diameter (typically 1 ½ times the outside diameter of the utility/pipe being installed).
ADVANTAGES OF HORIZONTAL DIRECTIONAL DRILLING
- When open trenching is not an option; Horizontal Directional Drilling is the answer.
- Elimination of costly and time-consuming excavation and restoration associated with open trenching, installations can be performed in less time.
- No dewatering is necessary when working below the water table, subsequently reducing costs and construction time.
- Not affected by seasonal temperature fluctuations since there is no need to backfill and compact soil materials to complete the installation.
- Less delays due to weather conditions.
- No need to close roads or redirect traffic around the construction site, thus maintaining normal traffic patterns and access to businesses and residential property.
- An advanced technology that is proven to be less disruptive, faster and more cost effective than all other methods of underground construction.
- Significantly reduced construction time and cost
- The elimination of costly, time-consuming excavation and restoration
- Directional drilling minimizes the need to remove expensive landscaping or endanger historic structures with excavation.
- Reduces the noise, environmental and safety risk associated with open-trench pipe construction.
- Only the drill, with a minimal amount of support equipment, is required on horizontal directional drilling projects
- Reduced impact on residents and business around construction site:
- There is no need to close roads or redirect traffic around the construction site, thus maintaining normal traffic patterns and access to businesses and residential property.
- Reduction in long-term costs associates with settlements
- Installations utilizing directional drilling reduce and in some cases eliminate settlements above the new pipe or conduit. This is particularly advantageous when installations are conducted beneath roads, highways, rail lines and foundations.