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.
- • 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
2) Equation of Friction Capacity
3) Correlation of Torque to Capacity
The torque needed to install a pile is empirically related to ultimate capacity
QULT= KtT
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
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
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
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