Rigid Inclusions

Rigid Inclusions, also known as Auger Cast Columns, are a ground improvement system utilizing unreinforced grouted columns installed with a continuous flight auger rig. Rigid Inclusions are used in soft soils to meet settlement criteria and/or improve bearing capacity in soft soils.

This allows for structures to utilize shallow foundations such as spread footings or slabs-on-grade. The drilled columns range in diameter from 14-24”. Rigid Inclusions are not connected to a pile cap. Instead, a load transform platform is designed and installed on top of the Rigid Inclusions to transfer the load from the structure to the soils and columns.


The Benefits of Rigid Inclusions:

  • Low Vibration
  • Less Noise
  • Allows the use of shallow foundations such as spread footings and slabs-on-grade in less desirable soils.
  • Increases the bearing capacity of weaker soils.
  • Suitable for most types of structures and soil types.
  • Suitable for most ground conditions including high water table applications.
  • Cost effective compared to deep foundation applications.

How it Works:

  • The drill rig advances the auger to the design tip elevation of the column.
  • A ready-mix grout is pumped through the hollow stem of the auger under high pressure as the auger is slowly withdrawn.
  • Install the load transfer platform over completed Rigid Inclusions

Celebrating Over 30 Years of Quality Foundation Construction Services

Technical Foundations have been designing and installing subsurface solutions for over 30 years on hundreds of successful projects across the Mid-Atlantic region.  Our ample experience and value engineering services can bring added value to your project. Please feel free to contact us for your auger cast piling and design needs.

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