This trenchless technology practice offers an alternative to traditional trenching or excavating. This is particularly useful where traditional methods are either not practical or simply not possible.
Horizontal Directional Drilling is also commonly referred to as a trenchless technology practice.
How Does Horizontal Directional Drilling Work?
Stage 1: Drilling the Pilot Hole
The first stage of the Horizontal Directional Drilling or HDD process begins with boring a small, horizontal hole, otherwise known as a pilot hole, under the crossing obstacle with a continuous string of steel drill rods.
Stage 2: Reaming Out the Pilot Hole
When the bore head and rod emerge on the opposite side of the crossing, a special cutter, called a back reamer, is attached and pulled back through the pilot hole.
It is the job of the reamer to bore out the pilot hole so that the pipe can be pulled through.
Stage 3: Pulling the Pipeline Through
Finally, the pipe is pulled through the side of the crossing opposite the drill rig.
1. Eliminates the Risk of Trench Digging Damage
Horizontal Drilling works from a surface area and therefore eliminates the risk of trench digging damage as there is no need for deep excavation when laying down pipework. This means that surfaces which are worth conserving are neither broken up or damaged.
2. Horizontal Drilling is More Cost Effective
It is also extremely cost effective as it requires only one piece of equipment as opposed to several different pieces of machinery as used when trenching.
3. Far Less Surface Obstructions and Noise
Horizontal Drilling is less obstructive to road, river and rail traffic because the working area is confined to the points of entry and exit. It is also produces far less noise and the result is only minimum disruptions and detours are experienced by the general public.
4. Horizontal Drilling Has Quicker Turnaround Times
Horizontal Drilling is a much quicker process to that of traditional methods of installing pipework and takes a fraction of the time to complete. This means faster turnaround times and project completion.
5. Drastic Reduction in Environmental Pollution
Horizontal Drilling greatly reduces the environmental impact of traditional drilling methods and is quickly becoming the preferred method of underground installation because of the greatly reduced ecological disturbance.
- Installation of cable sleeves under roads, highways and railways.
- Gravity lines for sewers and stormwater.
- Pressure lines and drinking water supply.
- Crossing underneath rivers and other waterways is also frequently performed.
Our cutting edge directional drilling equipment lets us leave the ground surface and other infrastructure completely undisturbed throughout a drilling project. As the drill head is remotely controlled and located in real time, it can accurately bore holes for hundreds of metres of varying diameters to install gravity lines, pressure lines and cable sleeves.
Rescue Rod has many years’ experience with Horizontal Directional Drilling (HDD) in South Africa and we have a specialised fleet of HDD Equipment. From a minor utility crossing to a large river, landscape and outfall pipe installation, we have the experience and equipment to meet any project requirements.
Sometimes when laying down a new pipeline system the project may be compromised due to a rock-bed under the ground.
Rescue Rod has various machine equipped for rock drilling
These machines are equipped with a DTH, which is the hammer that is used to break through the rock.
A down-the-hole hammer, referred to as DTH is designed like a mini jackhammer screwed on the end of a drill string. The fast hammer action breaks hard rock into small flakes, fragments and dust which is blown clear by the air exhaust from the DTH hammer. The DTH hammer is one of the fastest ways to drill hard rock.
Rescue Rod offers the following additional services within the Horizontal Directional Drilling Department:
Pipe cracking is a technique used to fracture an existing pipeline from the inside using a pipe cracking head.
Butt welding is a technique used to join two components together (also known as ‘jointing’). The idea is to connect the two parts but not to overlap the ends.