Technical Information


The first recorded use of Helical Piles, or Screw Piles was in 1836 by a blind brickmaker and civil engineer named Alexander Mitchell. Mitchell developed his screw pile as a means of foundation support for off shore light houses

Today, screw piles are used extensively in rail, telecommunications, roads and numerous other industries where fast installation is required, or building work takes place close to existing structures.

Modern screw pile design is based on standard structural and geotechnical principles.

The number of helices, their diameters and position on the pile shaft as well as steel plate thickness are all determined by a combination of:

  • The combined structure design load requirement
  • The geotechnical parameters
  • Environmental corrosion parameters
  • The minimum design life of the structure being supported or restrained.

Solidity Piles are designed, manufactured and installed in full compliance with AS 2159 and the BCA 2018.


Helical Anchoring Systems function in the same manner as that of Helical Piling.

Due to the wide helix plate and achieved minimum depth, uplift capacity equivalent to downward bearing capability is easily reached by helical or screw anchoring operations.

By weight, helical anchoring can provide as much as 50-100 times the uplift capacity of an equivalent concrete anchoring system.

We manufacture our own Helical Piles, Helical Anchors and Pile Cap Modules to ensure our customers are provided with the best quality product available.



Solidity Pile Specification Drawings​

Solidity Cap Specification Drawings​

Solidity Cap Catalogue