We used our Cat 311D ( 30,000# excavator) with a 10K anchor pile driver due to distance requirements and reach, ensuring a smooth installation. There was no damage to the pavers or underground utilities. The screw piles transferred the load from the soils to top of the new seawall to prevent it failing due to the additional loads of the access road structure.
Our screw piling were specified by the Foundation Technologies engineer team and they were ideal for supporting the loads (up to 8 tons per pile). The 10” x 12” helix pile system was rotated into the shoreline bank at distances of 14 foot to 42 foot. Our screw piles are unique in not requiring any concrete trades, thus removing the time delay in the construction for curing of concrete.
At Coastal Helical Solutions, we positively focus on the skilled applications that benefit our helical piling systems. This includes marine structures, new home construction, swimming pool construction and environmental and civil engineering productions. Helical piling and screw piles have been employed successfully for years in multiple piling applications.
Why were helical tieback anchors chosen for this Harbor Point Condominium application? Applying screw pile tie backs provided the following benefits:
- Less energy required to provide tension load capacity
- Smaller disruption of the soil due to slimmer core tube
- Capability to thread helical anchor around utility pipes
- Lighter equipment used which equals less noise
- Absolutely no disruption or inconvenience to condo owners
One hundred fourteen (114) “Chance Screw Anchor Pilings” SS5 Square Shaft Helical Pile (1-1/4” x 1-1/4”) new foundation pile with a 10”- 12”- double-helix lead section was installed into a compacted dense soil.. The screw anchors were rotated to tension capacity with a specialized hydraulic drive head (12K Digga). Helical extensions progressed the tieback anchors to distances on the order of 14 to 42 feet to realize final installation torques. The ultimate capacities and design working tension load of 16 kips.
One Hundred seventy-two (172) seven (7) foot SS5 Square Shaft Helical Pile (1-1/4” x 1-1/4”) extensions were utilized to reach required load capability due to sub-surface soil variations and debris.
In addition, we installed one hundred fourteen (114) three (3) foot extensions to close the gap between the vinyl wall panels and screw piling termination ends.
The helical tie back anchor was linked to a hot dipped galvanized steel channel, placed within the new seawall cap to provide lateral structural support. The tiebacks and anchors were load tested with a 30-ton center pull ram to secure required engineered load capacity of 16 KIPS.