Go Vertical with Confidence®

Micro Piles & Helical Piles

Slide 1

Folsom Dam 42" Water Main Bypass in Folsom, CA. HMP - 15' deep to restrain water hammer on the emergency repair of 42" water main for City of Folsom and Folsom prison water supply.

Slide 2

Cavallo Point at Fort Baker in Golden Gate National Park, CA. HMP – 15' to 20' deep to provide seismic retrofit of historic Army post barracks for the newly established Cavallo Point Resort.

Slide 3

American River College parking structure in Sacramento, CA. HMP – 20' deep to provide uplift resistance at shearwalls for seismic overturning forces at new 5 story parking structure.

Slide 4

Railway Express Annex Buildings at Railyards in Sacramento, CA. HMP – 60' to 75' deep to provide seismic retrofit foundation support in 1925 historic railway terminal and post office buildings.

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Overview

Micro Pile and Helical Pile (MP and HP) systems are small diameter, high strength, manufactured steel, component pile systems. MP/HP are drilled and screwed into the ground to develop bearing and tension resistance for the support of foundations. MP can be installed quickly in virtually all ground using mobile drilling equipment. The HP offers a well-defined, component steel pile with reliable support of foundations. MP/HP construction produces low noise and no vibrations. The MP/HP obtains capacity at a deeper soil layer in bonding to competent rock or bearing on the helical plates. MP/HP are often used for underpinning, temporary bracing of historic building walls, and new construction tilt panels. The MP/HP can be installed with low headroom equipment, in tight access areas, and in new construction for foundation bearing and uplift forces. MP/ HP are a versatile, cost effective, foundation pile for supporting foundations, bracing, and retrofit/repair projects.

MP/HP Applications

Seismic tension anchors, seismic retrofit, foundation underpinning, and wall tiebacks. The ideal applications for MP/HP:

  1. Seismic retrofit of existing buildings.
  2. Tight access areas for underpinning and added support.
  3. Sensitive sites with vibration concerns near critical structures.
  4. Foundation upgrade and retrofit in contaminated soil.
  5. Groundwater protection regions.

 

HMP 4-Step Construction Process

Slide 1

STEP 1

Start HMP lead section. Drill into ground at up to 15 RPM.

Slide 2

STEP 2

Add extensions with additional helix or plain for added depth.

Slide 3

Step 3

Cut-off and install HMP top plate or top connection brackets.

Slide 4

Step 4

Finished HMP in a pile cap.

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Technical Details

Micro Pile and Helical Pile system (MP and HP) offer high capacity, tight access, deep foundation support with nearly instant force resistance after installation. MP/HP are used for seismic retrofit, support new foundations, upgrade old foundations, add capacity to existing foundations, arrest settlement of foundations, and help lift a foundation as the structure will allow.

MP are high capacity, small diameter, structural piles, commonly 4 to 12-inches in diameter. MP are both drilled and injected with grout during installation leaving a grouted steel casing or threaded bar in the ground. MP can be drilled into all ground conditions with adaptable mobile drill rigs. They are usually bonded into competent rock or very stiff soil to achieve capacity.

HP consists of a lead section and one or more extensions that are screwed into the ground by application of crowd and torsion. The HP lead looks like a screw with single to multiple 6 to 14-inches diameter helices. HP capacity is initially monitored by the installation torque when installed into soil. The torque resistance is a function of the soil type and size of helix components. HP extensions are added as the pile is advanced into the ground.

Once the design depth and installation torques are reached the MP/HP are cut off and a load bearing plate or new construction bracket is attached. Full-scale load tests to 200% confirm design bearing and uplift capacity.

Farrell uses mobile drill rigs, excavators, and compact track loaders equipped with a drill to install MP/HP. These piles are commonly installed to depths of 15 to 100-feet with capacities ranging from 25 to 250 kips.

MP/HP are small diameter, high capacity, versatile, deep foundation piles that support your project to Go Vertical with Confidence®!

Testimonial

Testimonial Image

Baker Beach Rehabilitation Project

San Francisco, CA

“Through it all, the Farrell crew were very professional in working with full time onsite inspectors, Presidio Trust Representatives and unknown conditions underground. The entire job went smoothly and finished two days ahead of schedule.”

Deanna Bohler

Project Manager
Tricorp Hearn Construction

Micro Piles & Helical Piles

Geologic Hazard Application

Soft/Loose Soil

Contaminated Soil

Slope Stability

Diameter/Depth

  • 4 – 14 in dia
  • 10 – 150 ft deep

Compatible Soils

  • Sand (SP, SM, SC)
  • Silt (ML, MH)
  • Clay (CL, CH)
  • Bedrock
  • Contaminated Soil HP

Bearing Capacity Range

20 – 250+ kips

Key Advantages

  • Small equipment for tight access
  • Ideal for repair/retrofit
  • Minimal site impact
  • Low spoil - HP
  • No vibrations
  • CBC Compliant

Key Considerations

  • High material cost
  • Steel below water
  • Pile connections
  • Need access

Comparable To

  • Torque piles
  • Pipe piles
  • Concrete piers
  • Driven piles
  • Soil nails/tiebacks

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

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