Whether you are constructing a new building or working on foundation repair, you'll need piles to anchor and support the finished structure. Helical piles and micropiles are the two most popular types used. The guide below explores which situations each is best suited for.

Helical Piles

Also called helical anchors, these are utilized in large, deep systems. The screw-like helices, made of galvanized steel, are twisted into the soil like a corkscrew. As the helix gets deeper, segments are added to it and joined with couplings so that the pile can reach hundreds of feet below the ground. They are spaced evenly apart and work independently.

These piles can be installed with only six feet of overhead space, thanks to their segmented nature. Because they generate no vibrations as they are installed, they won't disturb the already unstable soil. This makes them ideal for underpinning existing foundations requiring low to moderate pile capacity. 

They are also great for installing new foundations. Contractors can use grouted columns for larger-scale projects by reinforcing each section of the pile as it is drilled. 

Micropiles

Also known as drilled micropiles (DMPs) or mini-piles, these are miniature versions of helical piles. They have a diameter between three and 10 inches and are installed with a steel casing filled with grout. A central threaded bar is then inserted through the grout before the casing is removed to create a bonding zone between the pile and the soil. 

Their smaller footprint makes micropiles ideal for work sites with extensive underground utilities that cannot be disturbed. They are also ideal for areas where the fill material is very dense or adjacent to structures that are sensitive to vibration. They are frequently used for replacing foundations, renovating facilities, supporting buildings during adjacent constructions, or seismic retrofitting.

The Dwyer Company is based in West Chester, OH, but also works on commercial and residential projects of all sizes throughout the Lexington and Louisville, KY, areas. They can install both helical piles and micropiles, as well as perform foundation repair and slabjacking. See their full list of services on their website. Call (502) 489-5438 to schedule a free estimate.