Below is a list of auger drilling methods and the types of applications you can apply them to—better understand these instances so you can make a sound decision for your next construction project.
Continuous Flight Auguring (CFA)—Unstable Soils
On a construction site, supporting the building through piles in the ground is essential for sustaining the structure. These piles help distribute the weight of the building from the surface of the ground to a depth more capable of holding the structure upright. This application provides earth retention, prevents landslides, and protects the building from other structural damage.
CFA piling occurs when a continuous flight auger creates a hole in the ground filled with concrete through a stem in the auger as you pull the machine from the ground. Afterward, reinforced steel is lowered into the filled concrete hole for better stability.
It is essential that your auger is the same length as your required hole, or you may get an uneven application when filling the ground with concrete. This type of drilling is often used when the soil you’re working with is unstable and contains materials such as sand or gravel.
Drilling Shafts or Caissons/Bored Piles—Taller Building Support
When a construction crew is building a tall structure or large bridge, this type of infrastructure needs adequate support to last many years. Drilling shafts, also called drilled piers, bored piles, or caissons, provide support through large axial and lateral loads. This process excavates shafts into the ground and fills them with concrete.
This type of application used with an auger can be installed in various ground conditions to accommodate overturning forces. Use this method near slopes for better stabilization and structure support for taller buildings.
Horizontal Auger Boring—Placing Conduit Beneath Structures
In some applications, you cannot dig straight into the ground with the auger and instead need to bore a hole horizontally to avoid disturbing an existing structure. A great example is running plumbing or conduit beneath sidewalks, railroads, or freeways.
The process of horizontal auger boring limits the risk of soil or the ground above your hole from collapsing into itself by placing a steel casing in the hole. Use this application for boring holes beneath existing geographic features.
Double Rotary Drilling—Cast-in-Piles or Pre-Drilling
This type of drilling application uses two different methods combined: CFA and continuous casing. As the auger extracts the ground, it simultaneously places the casing in the hole. Typically, this is used for cast-in-place piles or predrilling. It’s also common to use this method when conventional drilling is not feasible because of unconsolidated soil conditions.
The best feature of double rotary drilling is the ability to switch between drilling methods seamlessly. Suppose the component on your auger cannot perform the job. In that case, you can add different tools to the machine to drill through varying soils or use other drilling methods. This type of application is one of the more versatile options.
Consider these methods and applications for your next construction project. Providing support to a building or geographical feature is vital for a stable, long-lasting structure.
Image Credit: drilling drill ground By kichigin19 FILE #: 68722056
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