Piling contractors can easily use Continuous Flight Auger (CFA) method in an environmentally-sensitive area or near existing buildings without causing any noise or vibration. CFA piling is an excellent choice for load-bearing piles and adjacent or secant retaining walls. It is also possible to install CFA Piles without polymers, bentonite, or casing in cohesive clay and other non-cohesive materials like sand, gravel, and glacial till.
The Fundamentals Of Technique
The desired depth or resistance can be achieved by rotating it into the ground using a continuous-flight auger that is hollow-stemmed. The rig operator uses computerized instrumentation to pump concrete down the route of the hollow stem using a predefined pressure and flow rate to prevent the collapse of the pile shaft or avoid formation of voids in concrete. The pile success depends on this step. There are two ways to insert the strengthening cage into the fresh concrete after removing the drill: using an excavator or cage vibrating.
Advantages
- Reduced damage to surrounding structures due to lessened disturbance.
- Forget about using a case.
- Perfect for use on many different soil varieties
- Suitable for supporting walls
- Installing a new system quickly
Instrumentation
An interactive tool that has a touch screen type interface in the cabin of the rig allows piling contractors to accurately control and monitor different aspects of pile construction and predetermined specifications of quality-control. The pile data gets transferred from rig to the ‘cloud’ via the use of cell phone networks as each pile is completed, allowing for quality control in real-time of the CFA piling. You can also receive real-time data for a variety of metrics, like:
- Rotational Depth Of The Drill
- Speed Of The Penetration
- The Rotary Torque
- Winch Power Of The Crowd
- The Force Of Ejection
- The Speed Of Extraction
- Flow Pressures And Concrete Strains
- The Pumped Concrete’s Volume
A CFA Piling Cased In Concrete
To install more enormous contiguous and secant-piled retaining walls, cased CFA offers the advantages of both a CFA and a rotary solution. Allows for faster and constant drilling while keeping the pile in vertical position and watertight in a Secant Pile Wall. As the augers and casings rotate opposite to one another, the rotary drive units are linked and drill into the Earth simultaneously.
Precisely What Is A Piling Contractor’s Role?
Before anything else can be done, the site and the soil must be thoroughly examined and assessed. It is essential to consider the soil type and strength, water table depth, headroom, and ease of access when determining which piles and machinery are appropriate for a given situation.
Once the plans are finalized, the piling contractors will bring in their CFA piling experts and machinery. It is just one of the many benefits of working with a specialized contractor who will already have the necessary equipment on hand.
They will be inserted using whatever technology has been selected as the most appropriate. Restricted access piling rigs with remote power packs are a standard solution for mini-piling, as they significantly reduce the amount of site space needed.
