Helical Pile Foundation Engineered to Support Hillside Boardwalk Trail

Posted by Walder Foundation Products on Aug 21, 2020 11:15:19 AM

Helical piles have been gaining notoriety as an ideal foundation solution for many types of trails, boardwalks, and walkways. The town of Ashland, Virginia sought a pedestrian and bicycle trail constructed to connect Carter Park to the existing Ashland trolley line trail. The trail is an easy half-mile walk along a very straight and level path. To connect Carter Park to the Ashland Trolley Line Park trail a boardwalk was needed over the steep embankment along Walder road. The Ashland Trolley Line Park Trail is a Greenway trail which is protected and managed for conservation and recreational purposes.

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Topics: Construction, Foundations, Helical Pile Applications

How To Build A Lasting Pool Foundation

Posted by Foundation Technologies, Inc. on Aug 4, 2020 9:15:00 AM

As with a foundation on a home, the foundation of a swimming pool can experience sinking due to unstable or poorly compacted soil. Ensuring a pool is constructed on a deep, lasting foundation will protect the owner investment and save them from costly future repairs. Whether you're a contractor building a backyard pool or an indoor aquatic center, starting on a firm foundation is key for the long-term success of any project, and there are a wide range of variables in the design process.

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Topics: Construction, Foundations, Helical Pile Applications

Vertical and Battered Helical Pile Groups to Mobilize Lateral Load Capacity

Posted by Jason Herron, P.E., C.W.I. on Jul 9, 2020 8:15:00 AM

Helical piles have become a common piling system in the North American construction market.  They are used for many applications with low to moderate tension and compression loads.  Slender helical piles, less than 4.5 inches in diameter, have historically been used for light shear loads of 1 to 5 kips in vertical applications. This method derives the lateral capacity as a function of the pile’s allowable structural bending moment and the allowable passive earth pressure of the soil. It is common to analyze the capacity of the piles by theoretical slender pile equations, P-Y curves, or software programs that model P-Y response. An adequate safety factor or a service limit on the allowable deflection is applied to the allowable loads to determine an applicable pipe size. In recent years larger piles, with diameter greater than 5.5 inches, have been used for larger lateral loads.  Large diameter piles have been designed for loads in excess of 20 kips. 

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Topics: Foundations, Helical Pile Benefits, Engineering

Origin and Development of the Torque Correlation (Kt) Factor

Posted by Gary Seider on Jun 11, 2020 11:23:14 AM

Today, it is generally accepted that installation torque can be used to verify the axial capacity of helical piles.  The International Building Code (IBC) 2012, 2015 & 2018 Section 1810.3.3.1.9 states there are three ways to determine axial capacity.  Method 2 states the ultimate capacity can be determined from well documented correlations with installation torque.  The installation torque-to-capacity relationship is an empirical method originally developed by the A. B. Chance Company in the late 1950’s and early 1960’s. For over 60 years, Hubbell Power Systems, Inc. has promoted the concept that the torsion energy required to install a helical anchor/pile can be related to its ultimate capacity.  Precise definition of the relationship for all possible variables is the subject of on-going research.  However, simple empirical relationships, originally derived for tension applications but also valid for compression capacity; continue to be used as part of project specifications to verify capacity.  The principle is that as a helical anchor/pile is installed (screwed) into increasingly denser/harder soil, the resistance to installation (called installation energy or torque) will increase.  Likewise, the higher the installation torque, the higher the axial capacity of the installed pile/anchor.  The CHANCE® torque correlation equation is:

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Topics: Foundations, Engineering, Torque

Engineered and Tested High Capacity Foundation Solutions

Posted by CHANCE Foundation Solutions on Mar 13, 2020 8:54:58 AM

In response to a demand for predictable high capacity foundation solutions, a fully grouted screw displacement pile was developed by CHANCE® engineers. Comprised of a centralized steel shaft and a patented displacement assemblies, the pile, known as the Drivecast™ screw displacement pile, is designed to create a cylindrical annulus around the central shaft that is continuously filled with grout from a  gravity-fed reservoir at the surface.

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Topics: Construction, Foundations, Engineering, Torque

How to Avoid Future Foundation Follies when Building Your New Home

Posted by CHANCE Foundation Solutions on Feb 20, 2020 8:30:00 AM

When building a new home, short-term decisions usually include what floor tile to use in the kitchen or which coverings to put on the living room bay windows. Few homeowners think about which type of foundation offers the best long-term stability.

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Topics: Foundations, Civil, Engineering, Contractors, Residential

High Capacity Foundation Solutions for Difficult Site Conditions

Posted by CHANCE Foundation Solutions on Feb 11, 2020 10:13:00 AM

Traditional foundation methods can be tricky to implement when access is limited, overhead clearance is especially low, or soil conditions call for strict weight limitations. For instance, on swampy ground or low-quality soil, the machines needed to install conventional foundations cannot always operate safely or maneuver effectively.

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Topics: Construction, Foundations

Why Helical Piles are Effective for Foundation Repair

Posted by CHANCE Foundation Solutions on Feb 5, 2020 9:42:00 AM

With residential remedial foundation repair becoming a greater concern, the CHANCE® helical pile was developed in the mid-1980s and was issued a helical underpinning methods patent in 1992. This all sounds well and good, but the question remains: Why are helical piles so effective for remedial foundation repair?

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Topics: Foundations, Civil, Engineering, Contractors, Residential

What To Check If Your Helical Piles Are Breaking

Posted by Shawn Downey on Jan 30, 2020 9:15:00 AM

There is no equivalent for measuring torque directly in the tooling string.  Using differential pressure (or pressure drop across the motor) can work if it is properly set up and calibrated, but keep in mind that pressure is being measured, not torque. 

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Topics: Foundations, Civil, Torque

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