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Can a Helical Pier Be a Tieback?

February 15, 2012 | Comments: 0 | Views: 207

Absolutely yes. But first, what is a tieback? It is a device, when installed will resist being pulled. That includes pulling up, out, over, and virtually any direction.

One of the unique characteristics of a helical is that turning it into the soil creates a sort of "stability" in the soil. Should you want to push or pull on it, its resistance to movement is the same. It stays in place. Interestingly, one could say the capacity "in tension" (pulling out) is very similar the measure of "compression" (pushing in).

A tieback is always used in a tension application. But sometimes it performs both. The cables holding electric power poles are attached to helical tiebacks. They provide a "tension" only to keep the pole from blowing or tipping over in the wind. Radio and TV towers are often secured in place the same way.

Basement walls tend to push in. The heavy soil load outside can overcome the resistance capacity of the wall and cause it to crack, move, and conceivably literally push in. Early winter rains, if allowed to perk into the ground at the basement wall, can frequently, quickly freeze. Since ice expands, it increases the pressure against the wall, eventually cracking and moving it. Each year if the conditions are right, it will push a little more. The helical tieback helps resist the movement and can be used to pull the wall back. Directing the water away from the house including waterproofing techniques and properly installed gutters are important protections. This is also a tension application. This principle is used on retaining walls and sheeting.

Since a helical tieback has a two-way capacity, it can keep a vertical column from moving in or out. The support of a boardwalk is a perfect application of stabilization, putting supports in place to keep it from moving opposite directions.

This pull out capacity can resist wind forces that may overturn fixtures like a scoreboard, billboard, or other big, vertical face that reacts to wind pressure. This is what's referred to as "uplift resistance". A helical anchor can hold something down in a flood situation that might normally float away. It's also an excellent solution to hold down canopies at gas stations, resisting the uplift forces of wind, which can become severe.

Tieback, tiedown, battered pier, and many other names all apply to the uniquely versatile helical pier. New uses are frequently uncovered. These piers are still in a growing stage of usefulness.

Dave Cumings is a representative for Kent Foundation Systems, which provides free, no-obligation estimates and analysis for foundation repair MI. Kent services all of Michigan including Detroit, Lansing, North Michigan, and foundation repair Grand Rapids MI.

You can learn more on our site, from our blog, or schedule a free estimate by calling (616) 214-3262.

Source: EzineArticles
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