What is a pull test, and why would I need one?

When and why is a pull test recommended?  

Link to TRM

&#;We&#;re strong advocates for pull-testing on every wall we anchor, or pin, for a couple of reasons. One is that facade stabilization comes with life safety ramifications, and we take that extremely seriously. Also, we have third-party laboratory test values for anchoring systems, but when you&#;re working on a retrofit or post-installed anchoring project, the conditions can vary widely from one building to the next, and performance may not meet those laboratory values, or they could even exceed our published values. So, based on different variables like the condition of the mortar, brick, or whatever substrate you&#;re anchoring into, as well as the material properties of the substrate itself, the solution may differ from project to project and from wall to wall.&#;

&#;For example, there is always the chance that when you go on a project and install an anchor, the tested laboratory value estimates an ultimate capacity of 500 pounds, but when tested on-site it has a capacity of 50 pounds. In this case, clearly, you would need a different solution and you could work your way up from there to choose something that&#;s more appropriate for that project. In some cases, that could mean modifying the installation via drill type (SDS+ vs 3-jaw chuck hammer vs core drill), drill method (rotary-only vs rotary-hammer), or pilot hole size. In other cases, the type of anchor could be changed, either by increasing the anchor&#;s diameter and in turn its engagement into the substrate, or by switching the style altogether, say from a hammer-set Stitch-Tie helical anchor to an adhesive-style Grout-Tie, or even to a mechanical expanding fastener such as the Grip-Tie product line. Each of these has its own pros and cons, and a cost-benefit analysis could be done to find which anchoring solution is most appropriate for each project.&#;

The key metric that defines an anchor used to secure structures to asphalt is it pull force resistance.

For more Bolt Pull Testinformation, please contact us. We will provide professional answers.

As the innovator in the asphalt anchor industry, we encounter a lot of experienced engineers that have a healthy dose of doubt about our pull-force resistance claims. But the dramatic cost benefits of using our anchors provide a strong incentive for architects, mechanical engineers and PE to actually run their own pull tests.

We have previously provided guidelines for a simple vertical pull test setup. Recently, a customer was faced with a need to verify pull resistance at a 45 degree angle. I was impressed with the simple and effective method that they devised: placing a fork lift at the right distance and height from the anchor, and pulling using a heavy duty come along, through a digital load cell and a chain. With the weight of the forklift and the flexibility of its tires, the digital readings were stable and easy to increment.

When the SP12 anchor internal thread finally yielded at 5,400 lb. pull, anchor was still firmly embedded in the thick asphalt. It should be noticed that the anchor is rated for 2,000 lb. vertical pull.

If you want to learn more, please visit our website Friction Bolt.