The HeliFix PatchPin is based on the HeliFix DryFix technology which has been used for well over 20 years. It is further based on a spiral Stainless Steel twisted element being driven into a smaller hole in a substrate to obtain anchorage. For the purpose of a Wall Tie Pullout values are extremely important. Why the PatchPin works so well for concrete patching pins is that it is Stainless Steel and the twist provides maximum grip to the new patching material, the pin can be bent so Stainless Steel wire can be attached but Pullout not so much. If you look at the diagram you will see that when the PatchPin is installed at “alternate” angles they form an impediment which holds the patch in place as the pins are fixed by the substrate and the patch and cannot move. The only need for Pullout is to hold the PatchPin in for installation and attachment of the wire, after that no pullout is needed, only the geometry to hold it, and the concrete patch, in place. This is the misconception that most engineers have, that the performance of the PatchPin is based on Pullout, which of course, being in concrete always exceeds 400 pounds anyway.
