Helical Piles

Helical Piles Installation

CJGeo is a factory-certified installer of Chance helical piles.  We install for new construction, remedial underpinning and tieback installations.  

Types of Helical Piles

 

We install square bar, round shaft and helical pulldown micropiles.  All pile configurations are designed by a Professional Engineer, and stamped submittal drawings are available for all installations.

Advantages of Helical Piles

Helical piles, which are sometimes called screw piles or helical piers, are an excellent alternative to driven foundations.  Helicals can be installed with compact equipment, and don’t require any vibration or impact loads during installation.  This allows installation in tight sites, in and on occupied buildings, and other applications where minimizing disruption are important.

Because helical piers are screwed hydraulically into the ground, they can be installed to high load capacities even under lightweight structures, or before a structure is even built.  A prime example of this advantage is installing helical piles under an existing foundation before adding an additional floor or other significant increase in loading.

Apartment foundation repair using helical piles.

Helical pile installation for apartment foundation repair.

Foundation Repair with Helical piles

Before helical piles are screwed into the ground, the footer is exposed, and notched.  Next, the crew hydraulically screws the pile into the ground.  The weight bearing capacity of the pile is calculated from the force it takes to turn the pile.  When enough resistance is met, the pile has reached suitable bearing strength from the soil. The top of the pile is cut to the correct height, and a lifting bracket is installed between the bottom of the footer and the pile’s top. Lifting is then completed using hydraulic jacks.  The piles are secured, the lifting jacks are removed, and the access holes are backfilled.

New Construction Helical piles

Helical piles for new construction are generally installed for two reasons.  First, a new building to be built on soft or weak soils.  Helical piles in this case allow for transferring the load of the foundation to strong, deeper layers of soil.  The second scenario is buildings being added onto, when the soil under the foundations may not be able to hold up the increased weight of the structure.

Helical pile Project Profiles