screwing in

Blade Pile

The ‘Blade Pile’ is our preferred screw pile as it is an innovation to traditional screw piles and is a cost-effective substitute for regular screw piles, timber driven piles or concrete piles.

To quote our blade pile manufacturer [the blade group]

The Blade Pile can replace concrete bored piers by using our ‘Slip Joint Cap’.

  • More holding force than helical screw piles
  • Manufactured from high tensile steel
  • High torque and load capacity.
  • Minimal installation issues.
  • Improved durability & extended design life.
  • Fully compliant to AS2159 and AS2870.
  • Withstands corrosion of a ‘moderate’ classification
  • (AS2159) without additional protection.

 

Screw piles have one leading edge with a curved pitched helix that augers the soil during install. The single leading edge generates out of round forces and the trailing edge of the helix then follows into disturbed material.

Blade Pile vs Screw Pile

Over time and through soil settlement, bearing capacity will slowly ‘grow’ back into place around the full helix area (shaded Orange in diagram).

The patented twin Blade Piles counter balance for improved pile verticality. The Blades sliver into the soil with less disturbance for improved end bearing compression and tension load capacity that is fully achieved at install.

Blade Piles are manufactured from 350 Grade high tensile steel (Average 450 Mpa yield) for a higher torsional install capacity and structural strength.

Blade Piles provide a level of installed verticality and positioning for finite tolerance structures, that is simply unattainable with screw piles or most traditional piling methods.

250 Blades vs. 250 Helix

A standard 76.1 Blade Pile has a 250mm x 250mm square end bearing area, comprising a pair of Blades that provides a diagonally extended circular area of 350 mm.

Under load, this extended area radiates out and into a larger pressure wave, when compared to a circular 250 mm diameter screw in helix.

The larger pressure wave generated by the blades, mobilizes a higher volume of soil into a more effective pressure bulb, for improved load bearing capacity.

During comparative testing, the twin Blade Pile design also demonstrates less soil bulking out during initial penetration, confirming less geotechnical disturbance during installation for improved end bearing.

Trailing edge ‘cutting tips’ create an active ‘4 point pulse’ during installation which vibrates the Blade Pile head for easier installation when penetrating heavy gravels or rock/cobble layers.

For the full technical data preview click here:    tdmcontents