They are a very effective solution for foundation repair where soil conditions require deep piles to be installed. There are several competitive advantages for using helical piers versus other systems, especially when working with an existing building.
The equipment needed for installation is generally smaller, lighter, and less specialized than equipment used in other types of deep foundations. The cost of mobilization (move in, move out) is usually less than other systems as a result. This also allows contractors access to tight or confined areas to install helical piles where the larger equipment simply could not fit.
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Another advantage is that helical piles are installed vibration free because they are turned in with a torque motor, very much like a wood screw being turned into a piece of wood. When working on an existing structure (or if neighboring properties have existing structures close by) it's wise not to create any opportunity for additional settlement.
When installing helicals, the contractor should continually monitor the torque it takes to install each pier. The torque rating directly relates to the capacity of each pier, so the contractor knows at the end of each installation what load or capacity each pier will support.
When helical piers are installed they can be immediately loaded; there's no cure time required after installation.
Because helical piles are turned or "screwed" in, there's minimal excavation required. When installing the piers, there are no spoils to be hauled away or removed from the site, saving the additional cost of removal and disposal.
When using smaller installation equipment, noise pollution is drastically reduced. No violent hammering or banging is required to install helical piers.
Another very important advantage of utilizing helical piers is that, although they can be used for new construction projects, they're a great solution for projects where existing foundations have failed. Rather than removing the existing foundation and disposing of it in a landfill, contractors install helical piers under the existing foundation to create a deep foundation system, contributing to a "green" environment.
These are just a few of the advantages of using helical piers. Because every project is a little different, any number of factors could make them the right solution for your project. Check with a structural engineer or local foundation repair service provider to see if they're right for your job.
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