When and why is a pull test recommended?
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&#;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.&#;
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&#;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.&#;
Our experts at ATS are the best when it comes to Anchor Pull Testing. The main purpose or objective for the use of this test is to measure the performance of the anchor installation, and verify that it will resist the pull out forces. Several parameters such as the capacity of the loading apparatus, the loading rate, the bearing ring size, and anchor embedment depth should be taken into account when setting up the test. Ideally, unless the purpose of the test is determining the maximum pull out force, the anchor bolt should not fail or show any movement at the specified load.
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