Applications

Today Helical anchors or otherwise Screw Piles are used for almost every single small and big projects mostly in the United States, UK, Australia, New Zealand and Canada. Europe is also fast accepting this mode of Piling.

These helical Anchors can be applied in the following Projects:


  • • Fresh Foundations
  • • Underpinning

  • • Solar Power plant Foundations
  • • Portable homes

  • • Soil nailing
  • • Tieback anchors

  • • Modular housing using MMC
  • • Rail/Highway Infrastructure

  • • Pipeline foundations
  • • Environmental walkways

  • • Tower foundations
  • • Restricted access sites

  • • Foundation strengthening
  • • Industrial/retail foundations

  • • Extensions to buildings
  • • New build on flood plains

  • • Marine pontoon guides
  • • Staging foundations

  • • Marquees/temporary stadiums
  • • Temporary or permanent car decks

Benefits :

20 to 200 kip ultimate capacity range.
Can be used in tension or compression.

Up to 20 times faster installation then driven piles

No reinforcement requirements

Eco sensitive, minimal impact

No spoils during installation Vibration and free installation Adaptable to almost any foundation

No welding in the field Efficient and Fast installation in any weather


1) Indivisual Helix Bearing
QULT = ∑QH
Where
QULT
= Total Helix (Multi) Anchor Capacity
 
QH
= Individual Helix Capacity

QH = AH (CNC+ qNq) ≤ QS
Where
AH
= Projected Helix Area
 
QS
= Upper limit (based on Helix) strength
2) Equation of Friction Capacity
Qf = ∑[∏DfS∆Lf]
Where
D
= Diameter of the Grouted Pile Column
 
fS
= Sum of fiction and adhesion between soil and pile (force/area)
 
∆Lf
= Incremental pile length over
 
∏D and
fS are constant 
3) Correlation of Torque to Capacity
The torque needed to install a pile is empirically related to ultimate capacity
QULT= KtT
Where
QULT
= Ultimate Capacity [lb(kN)]
 
Kt
= Empirical Torque factor [ft–1]
 
 
Default value = 10(33) for solid shafts
 
 
Default value = 8(26) for 73mm pipe shaft
 
 
Default value = 7(23) for 88.9mm pipe shaft
 
T
= [ft-lbs or (kN-m)]
 
T
= Torque