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CFA

CFA (Continuous Flight Auger) is a single pass piling method, where a continuous flight auger is used to drill to depth. During the grouting phase, concrete is pumped through the auger simultaneously with the extraction of the auger from the ground. Usually a computer is used to monitor the concrete flow and pressure to ensure the pile integrity. Typical diameters vary from 12in to 48 in to a maximum depth of 110ft. It is a fast and efficient way to install piles on soil or soft rock conditions.

We offer machines in two different CFA Configurations. Our cylinder crowd models can be converted to Bottom Drive CFA, which is a patent system by CZM. Our Cable Crowd models can be converted to Top Drive CFA.

Bottom Drive CFA

Bottom Drive CFA allows for deeper depths and higher torque.

The revolutionary patented system Bottom Drive CFA applies to the execution of continuous flight auger piles. The position of the rotary head at the foot of the drilling rig displaces the entire center of gravity of the equipment downwards, allowing a better use of the drill in reaching greater depths and drilling diameters. In this system, the drilling tool – auger – is part of the mechanism of torque transmission, so that notches are opened aligned along its full length. These notches fit the keyways connected to the rotary head which allow for the drilling when the auger is rotated. The Bottom Drive CFA equipment, when compared to those using the traditional system, has the advantage of being much lighter and more balanced, resulting in lower investment with superior performance. Other advantages are the use of friction pull-down for better penetration in hard soil and easy adaptation for the application of telescopic rod while executing excavated piles.

  • Significant improvement of stability, providing greater security in the operation of CFA
  • Optimal ratio of drilling depth x equipment weight due to lower center of gravity, enabling lower transport weight and lower transportation costs.
  • Hydraulic pull-down on the rotary, centered to the drilling auger, improving the penetration in hard soils.
  • Highly effective drilling torques due to the robust drilling head.
  • Better efficiency of power due to the short length of hydraulic hoses that feed the drilling head, resulting in lower pressure loss.
  • Lighter drilling masts as a result of there being no need to resist high drilling torque at the top.
  • Higher Extraction force, resulting from the addition of push-up of the cylinder to the winch extraction force.
Standard Chassis: CAT 352 Tier IV
Installed Power: 432 hp 322 kW
Maximum Torque: 252,000 ft.lbs 35,000 kg.m
Maximum Diameter: 48 in 1,200 mm
Maximum Drilling Depth: 93 ft 28,500 mm
Operation Weight 230,000 lb 104,500 kg
Standard Chassis: CAT 336 Next Gen
Installed Power: 323 hp 242 kW
Maximum Torque: 193,230 ft.lbs 26,200 kg.m
Maximum Diameter: 48 in 1,300 mm
Maximum Drilling Depth: 93 ft 28,500 mm
Operation Weight 180,000 lb 81,800 kg
Standard Chassis: CAT 330 Next Gen
Installed Power: 275 hp 205 kW
Maximum Torque: 134,300 ft.lbs 18,620 kg.m
Maximum Diameter: 36 in 900 mm
Maximum Depth: 67 ft 20,300 mm
Operation Weight 115,000 lb 52,250 kg
Standard Chassis: CAT 336 Next Gen
Installed Power: 314 hp 234 kW
Maximum Torque: 234,100 ft.lbs 31,800 kg.m
Maximum Diameter: 32 in 800 mm
Maximum Drilling Depth: 102 ft 30,000 mm
Operation Weight 190,000 lb 86,400 kg
Standard Chassis: CAT 336 Next Gen
Installed Power: 314 hp 234 kW
Maximum Torque: 193,360 ft.lbs 26,700 kg.m
Maximum Diameter: 24 in 600 mm
Maximum Drilling Depth: 102 ft 31,000 mm
Operation Weight 190,000 lb 86,400 kg
Standard Chassis: CAT 336 Next Gen
Installed Power: 314 hp 234 kW
Maximum Torque: 193,360 ft.lbs 26,700 kg.m
Maximum Diameter: 24 in 600 mm
Maximum Drilling Depth: 83 ft 25,600 mm
Operation Weight 138,000 lb 62,700 kg
Standard Chassis: CAT 330 Next Gen
Installed Power: 275 hp 205 kW
Maximum Torque: 151,100 ft.lbs 21,500 kg.m
Maximum Diameter: 32 in 800 mm
Drilling Depth (Auger Only): 43 ft 13,100 mm
Operation Weight 105,000 lb 47,800 kg
Standard Chassis: CAT 330 Next Gen
Installed Power: 164 hp 122 kW
Maximum Torque: 34,000 ft.lbs 4,700 kg.m
Maximum Diameter: 24 in 600 mm
Maximum Depth (20in Diameter): 60 ft 18,200 mm
Maximum Depth (24in Diameter): 45 ft 13,700 mm
Operation Weight 72,500 lb 33,000 kg
Standard Chassis: CAT 316F
Installed Power: 117 hp 88 kW
Maximum Torque: 36,165 ft.lbs 4,700 kg.m
Maximum Diameter: 20 in 508 mm
Maximum Depth: 52 ft 6 in 16,000 mm
Transport Weight: 60,000 lb 27,215 kg

CZM USA is a specialized foundation equipment manufacturer headquartered in Savannah, GA.

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