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

When and why is a pull test recommended?

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We are strong advocates for pull testing on every wall we anchor, or pin, for several reasons. Firstly, facade stabilization has serious implications for life safety, and we take this matter very seriously. Secondly, while we have third-party laboratory test values for anchoring systems, the conditions can vary significantly from one building to another during retrofit or post-installed anchoring projects. As a result, the actual performance may not align with those laboratory values or could even exceed them. Factors such as the condition of the mortar, brick, or substrate being anchored, as well as the substrate’s material properties, can lead to varying solutions from project to project and wall to wall.

For example, there is always a risk that when you install an anchor on-site, that anchor may only achieve a capacity of 50 pounds instead of the lab-tested estimate of 500 pounds. In such a case, a different solution would be necessary, and you would need to evaluate options that are more suitable for that specific project. This might involve modifying the installation method, such as changing the drill type (e.g., SDS+ vs. 3-jaw chuck hammer vs. core drill), the drill method (e.g., rotary-only vs. rotary-hammer), or the size of the pilot hole. Alternatively, you may need to change the type of anchor being used, either by increasing its diameter for better engagement or by switching to an entirely different style, such as transitioning from a hammer-set Stitch-Tie helical anchor to an adhesive-style Grout-Tie or even a mechanical expanding fastener like the Grip-Tie product line. Each of these options has its own advantages and disadvantages, and it’s helpful to conduct a cost-benefit analysis to determine the most appropriate anchoring solution for each project.

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

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

As an innovator in the asphalt anchor industry, we often encounter experienced engineers who may doubt our pull-force resistance claims. However, the significant cost benefits of using our anchors provide a strong incentive for architects, mechanical engineers, and PE to conduct their own pull tests.

Recently, a customer faced the challenge of verifying pull resistance at a 45-degree angle. I was impressed with the effective method they devised: positioning a forklift at the correct distance and height from the anchor, using a heavy-duty come along, a digital load cell, and a chain for pulling. Thanks to the weight of the forklift and its flexible tires, the digital readings remained stable and were easy to increment.

When the SP12 anchor's internal thread finally yielded at 5,400 lb. of pull force, the anchor was still firmly embedded in the thick asphalt. It’s worth noting that this anchor is rated for a vertical pull of 2,000 lb.

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