Go Vertical with Confidence®

Auger Cast Pile &
Drill Displacement Pile

Slide 1

One Marina Townhomes in Redwood City, CA. DDP - 16" diameter by 50' deep for foundation support for the residential townhomes in bay mud.

Slide 2

One Marina shoreline improvements in Redwood City, CA. DDP - 24" diameter by 45' deep for seismic buttress of slope in bay mud.

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One Marina shoreline improvements in Redwood City, CA. DDP - 24" diameter by 45' deep for seismic buttress of slope in bay mud.

Slide 4

Tracy Fire Station in Tracy, CA. DDP - 18" diameter by 38' deep for foundation support of new DSA approved fire station building.

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Overview

Auger Cast Pile and Drill Displacement Pile (ACP and DDP) systems are partial and full displacement, structural pile, deep foundations. ACP/DDP provide well-defined, steel-reinforced, concrete piles with reliable, high capacity support of heavy foundation loads. Traditional ACP uses a continuous flight auger to drill thru dense soil. DDP uses a displacement drill to compact soil in the ground, resulting in higher capacity and low spoils. The large cavity expansion effect of DDP displaced soil produces higher strength. DDP is essentially the “low-spoil” and higher capacity version of ACP. ACP/DDP strength and reliability are also enhanced by the pressure grout effect during construction. ACP/DDP construction produce low noise and no vibrations. ACP/DDP are used the same as a driven pile; to support heavy structures on soft and weak soil at deeper more competent soil or on bedrock. ACP/ DDP provide reliable, strong, deep foundation support for heavy loads with reduced settlement.

ACP/DDP Applications

Support very heavy foundation loads, structural slabs, structural mats, and industrial  foundations. The ideal applications for ACP/DDP:

  1. Soft and loose soil sites and bay mud/sensitive soil sites.
  2. DDP at contaminated soil and undocumented debris fill sites.
  3. Structures with high lateral forces.
  4. Groundwater protection regions.
  5. Sensitive sites with vibration
  6. concerns near critical structures.
  7. Sites near occupied buildings and in dense urban areas.

 

4-Step Construction Process

Slide 1

Step 1

Heavy crowd + high torque = drill displace to the design depth. Install cavity expansion.

Slide 2

Step 2

Withdraw auger, pump concrete under pressure. Install pressure grout effect.

Slide 3

Step 3

Install rebar cage into fresh concrete to form ACP/DDP.

Slide 4

Step 4

Finished pile cap with ground improvement and ACP/DDP.

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Technical Details

Auger Cast Pile and Drill Displacement Pile (ACP and DDP) are mainstream in California and the West Coast. ACP use partial displacement, continuous flight augers in dense soil regions. The DDP method utilizes an improvement to common ACP construction. The DDP displacement tool is shaped to laterally displace and compact the adjacent soil into the ground. The displacement tool and the pressure grout effect result in a coarse sided pile with finished diameters greater than 100% of the neat tool diameter. The soil displacement produces cavity expansion effects that 1) increase shear strength, 2) increase density, 3) increase over-consolidation, 4) reduce void ratio, and 5) increase stiffness of the confining soil. These physical benefits of DDP construction result in reliable, high capacity, deep foundation piles.

Engineered steel rebar cages are installed into the structural grout to resist the vertical, lateral, and uplift loads. ACP/DDP with an expanded base can achieve much higher end bearing capacity than traditional concrete piers and driven concrete piles. Full-scale, instrumented, load tests on ACP/DDP confirm vertical bearing and uplift capacity. Lateral load tests are sometimes performed to confirm lateral capacity.

Farrell uses heavy, fixed mast, piling drill rigs to install ACP/DDP. Farrell operates Leibherr, Casagrande, and Bauer rigs. These rigs install ACP/DDP to depths of 20 to 104 feet. Farrell installs ACP/DDP with tool diameters of 14, 16, 18, and 24-inches. The rigs are equipped with electronic monitoring to record drill torque, drill depth, drill speed, concrete pump pressures, and concrete volume for engineer review.

ACP/DDP are well-defined, high capacity, structural, deep foundation piles that support your project to Go Vertical with Confidence®!

Testimonial

Testimonial Image

Archer Hotel

Napa, CA

“James and the Farrell team throughout 10 weeks on site kept safety, communication, and a clean site up to date each day in a professional manner. Working with this field crew was a pleasure…and I look for another successful job with Farrell.”

Brian Hansen

DEACON

 

Auger Cast Pile & Drill Displacement Pile

Geologic Hazard Application

Soft/Loose Soil

Liquefaction

Contaminated Soil

Lateral Spread

Slope Stability

Diameter/Depth

  • 14, 16, 18, 24 in dia
  • 20 – 104 ft deep

Compatible Soils

  • Sand (SP, SM, SC)
  • Silt (ML, MH)
  • Clay (CL, CH)
  • Contaminated Soil - DDP
  • Undocumented Fill

Bearing Capacity Range

100 – 800+ kips

Key Advantages

  • Deep pile with ground improvement - DDP
  • High capacity
  • No vibration
  • Low spoil - DDP
  • Steel reinforcement
  • CBC compliant

Key Considerations

  • Deep pile
  • Engineered grout
  • Low spoil - DDP
  • Concrete cleanup
  • Flat stable pad
  • Pile connections

Comparable To

  • Auger pressure grouted piles
  • CFA Piles
  • Driven piles
  • Concrete piers
  • Torque/pipe piles

Farrell Design-Build Inc.  |   Sacramento  530.621.4867   |   Irvine  949.428.9596

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