If you’re securing a new foundation or repairing an existing one, you’ll be looking at helical anchors to complete your project.
Helical anchors, often called screw anchors, are commonly used for underpinning and settlement arrestment; however, they can also be used for tiebacks, uplift anchors and new construction piles. The pile is constructed simply by screwing the anchor into competent load-bearing soil.
The pile capacity is a function of the installation torque achieved during installation. Helical anchors come in various shaft sizes and helix configurations, allowing for lots of options to meet the required specifications.
Advantages of Helical Anchors
The major advantages of helical screw anchors are speed of installation and the ability to load the pile immediately. Since there’s no need to wait for grout to cure, you can get back to work right away.
Another benefit is that helical anchor installation can be achieved with relatively small equipment and in areas with very tight access. Also, there are no spoils left from the installed pile, making the installation process very clean compared with other pile types.
Helical anchors have their disadvantages, too. For starters, they cannot be installed into or through rock. Also, lateral stability or buckling can be a concern in certain soil conditions.