Horizontal Directional Drilling

Posted by: Team GUC

August 05, 2020

Horizontal Directional Drilling (HDD), describes the trenchless method of installing underground infrastructures without needing to disturb the surface.

Pre-project planning ensures we are aware of all pre-existing underground services.

Global Utility Construction are horizontal directional drilling experts.

Our HDD crews use cable locators to locate and identify the existing underground infrastructure and locate any services not outlined in any plans.

GUC has the modern equipment and experienced drillers to ensure that drills are guided to the desired location.

Infrastructures include

  • Telecommunications
  • Power cable conduits
  • Water
  • Gas

What makes a horizontal directional drill “Directional”?

The ability to steer the head of the drill along great distances is what sets the HDD apart from any other machine.

Operators can start drilling at one point, monitor and adjust depth and alignment over the entire bore, generally up to 140mts. The bore can be much longer depending on the power of the machine and the number of drilling rods utilised.

How a horizontal directional drill works

The head of the drill has three primary purposes, they are;

  1. To cut a hole for the rods to pass through and eventually the pipe.
  2. To steer the bore. Steering the bore is achieved by the shape of the head (see pic), contrary to what you might think, the drill rods and head are not continually turning and cutting. For a straight drill, the rod spins cutting an even amount of ground from all angles, as the head cuts, the rods are pushed in behind. For directional steering, the drill head is specifically positioned that when thrust is applied, the shape of the head determines progression in that direction. The beacon transmits a signal to the steerer on the surface holding the receiver.

To house the sonde/transmitter. The transmitter tells the steerer the current depth of the head, the front and rear position of the head (giving the direction) and lists pitch. (The pitch is the percentage the rod is predicted rise (+) or fall (-) over the course of installing a rod on flat ground. Given each rod is 3m, if the pitch reads +10, a rod is predicted to reduce in cover by 300mm over the next 3mts.) The receiver also shows the drill head as a clock face, enabling the steerer to know which point the head is in its rotation. For example, if the clockface reads 12, the head is in position to be pushed up, if it is at 3, it is in position to be pushed to the right and so on.

Benefits of Horizontal Directional Drilling (HDD)

1.   HDD is cost efficient. HDD will minimise restoration costs, including trench or concrete/bitumen reinstatement. HDD operates through all underground matter, including hard rock, thus eliminating the need for costly heavy equipment.

2.   HDD is time efficient. Compared with trenching, HDD can install pipe in minimal time, especially over long distances. Each shot can achieve a minimum of 20 meters and up to 200meters. Lower installation times can improve your project schedule.

3.  Compared with trenching, HDD is an Environmentally conscious civil works process. Only two pilot holes there is minimal surface disturbances compared with ordinary trenching.

4.   To the public eye, there is less impact.

5.     HDD simplifies installation in areas with limited access.

  • Under buildings
  • Roads
  • Railway tracks
  • Hills
  • Waterways
  • Congested areas
  • Environmentally sensitive areas

6.   HDD will minimise project Life cycle costs that stem from surface slumping and reinstatement to back fill trenches.

7.   Less disruption to traffic and pedestrians in congested areas and no need to close roads. For more information on Horizontal Direction Drilling or information regarding our Turn-Key Communication infrastructure services please contact us directly.

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