Screw Piles
Screw Piles
(OP)
Is there a comprehensive book or manual available on screw (helical) pile design?
I have some design literature on screw piles based on:
1) capacity due to bearing capacity of the helices only, and
2) capacity due to a combination of bearing capacity of the bottom helix (pile is in compression) and the cylindrical shear resistance of the soil between helices (assuming there are two or more).
I get different values using both approaches (about 20% difference in calculated capacity).
Any comments would be appreciated.





RE: Screw Piles
RE: Screw Piles
http://abchance.com/helical/
There are others too.
Structure mag also has some articles:
http
htt
http://www
RE: Screw Piles
RE: Screw Piles
Generally for initial design the helical piling manufacturer has their own empirical formulii, or they generally use only the bottom helix in bearing and then the friction on the cylinder of soil between the lower and upper helix.
These values are then verified on site by comparing installation torques with the expected torque for the required strength and soil type. (once again empirically based).
I have seen references in manufacturer documentation that is similar to the criteria you mentioned above.
RE: Screw Piles