How Does Corrosion Impact the Service Life of Earth Anchors in Water? Let’s Evaluate!

Posted by Gary L. Seider, PE on Jul 8, 2021 3:00:00 PM

Every application is different, but they often have something in common with other applications. We normally consider helical guy anchor performance in different types of soil, but different underwater applications can also impact the service life of guy anchors.

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Topics: Anchors

Serving the World through Hands-On Helical Pile Training

Posted by Timothy See Thoe on Mar 19, 2021 8:00:00 AM

At Hubbell Power Systems, Inc. (HPS), we are committed to providing our customers with outstanding service, whether in our hometowns or halfway across the world. In 2019, prior to COVID-19, two engineers from HPS spent two weeks giving presentations and training crews in Sri Lanka on the application and installation of CHANCE® helical piles and anchors manufactured by HPS. Here is their story:

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Topics: Anchors, Helical Pile Benefits, Training

Why Measuring Torque Matters

Posted by Tim Staelens on Jun 24, 2020 9:00:00 AM

The torque-to-capacity relationship for helical anchors and piles is an empirical method originally developed by the A. B. CHANCE Company beginning in the late 1950s. Today, the relationship is well recognized in the deep foundation industry. It is commonly referred to as torque correlation.

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Topics: Construction, Anchors, Foundations

Guy Anchor Testing Procedure

Posted by Tim Staelens on May 20, 2020 11:00:00 AM

Predicting the holding capacity of an anchor can be difficult due to soil variations at different depths and different structure sites. It is critical to understand anchor capacity to ensure the integrity of your guyed structures.

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Topics: Anchors

4 Reasons to Field Test Helical Guy Anchors

Posted by Tim Staelens on May 13, 2020 11:00:00 AM

The reliability of our overhead power and communication lines is as important today as ever before. The integrity of overhead construction often relies on guy anchor systems that can be trusted when put to the test during high wind loading situations and when tree branches come into contact with the lines.  If an anchor pulls even the slightest amount, it causes the top of the pole to lean. This can cause improper line sag resulting in clearance issues.

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Topics: Anchors

How to Install Helical Anchors for Utility Poles in Rock-Hard Soil

Posted by Tim Staelens on Nov 29, 2019 4:30:00 PM

Caliche is best described as salt-cemented sand. Naturally occurring in arid and semi-arid regions, caliche is a dense, thick layer of rock-hard ground that anchor installing machines can barely scratch. CHANCE® engineers, wanting nature’s toughest test for their ROCK-IT™ helical anchor, took product to the Atacama Desert in Chile, to see if the square shaft anchor with a carbide tip welded to the shaft would live up to its name.

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Topics: Construction, Anchors, Foundations

Calibration of CHANCE Wireless Torque Indicators

Posted by Tim Staelens on Nov 21, 2019 8:15:00 AM

It is well-documented that the best method for predicting the capacity of helical piles and anchors is to measure the installation torque. Accurate torque measurements are crucial to calculate the load capacity or holding capacity.

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Topics: Anchors

12 Steps to Install Earth Anchors: Round Rod and SS Anchors

Posted by Tim Staelens on Apr 17, 2019 3:09:00 PM
  1. Once all safety concerns have been addressed, attach the Kelly bar adapter and installing tool assembly to the Kelly bar on the installing truck.
  2. Insert the upper end of the anchors’ lead section into the installing tool. Position the anchor at the desired guy location and at a near vertical position; screw the first helix into the ground.
  3. When the first helix is buried, begin to make the angular adjustment for the desired guying angle.
  4. Remember, final angular adjustments should be made before the second helix penetrates the ground.
  5. When the installing tool becomes 12”-18” from the ground, disconnect it from the section in the ground and reconnect it to the next extension.
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Topics: Anchors

Maintaining your Anchor Tools

Posted by Tim Staelens on Mar 11, 2019 1:07:00 PM

As with most mechanical devices, CHANCE® anchor-installing tools periodically require maintenance checks to ensure peak performance.

SHEAR PIN LIMITER

In the case of the shear-pin torque limiter, (see drawing and photo) you should be able to rotate the tool shear halves independently from one another using a smooth-turning action. If rotation cannot be done by hand or if movement is challenging, disassemble the torque indicator to check the thrust bearing, washers and/or pin for wear.

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Topics: Anchors

7 Steps to Install Expanding Rock Anchors

Posted by Tim Staelens on Feb 13, 2019 11:25:00 AM
  1. Choose anchor site carefully. Rock anchors will only perform effectively in solid competent rock (Class 0 Soil).
  2. Drill the hole into the competent rock a minimum depth of 12 inches along the drill steel. Be sure to drill so that the anchor rod will be in line with the guy.
  3. Holes should be drilled so the diameter is optimally an 1/8th inch larger than the diameter of the unexpanded anchor. For example, the hole drilled for a R315 is 1-7/8 inch diameter. However, drill bits are usually available in 1/4 inch increments. In practice, a 2 inch diameter hole is drilled for the R3_ series anchors and a 2-1/2 inch dia. hole is drilled for the R1_series anchors. Be sure to thoroughly clean the drilled hole of rock dust and debris.
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Topics: Communications, Anchors