Caution also applies if the drilling method used deviates from that required in the approval, e.g. drilling is carried out with an impact, although the ETA of the washer anchor describes a rotary drill position for the substrate used.
Whenever no load-bearing capacity values are specified in the ETA for the explicitly existing substrate or the selected drilling method, anchor pull-out tests must be carried out. Only with the data from the tests can the proof of the total load-bearing capacity of the ETIC system be provided and thus the required numbers of anchors be calculated.
How is an anchor pull-out test carried out?
A special, tested and calibrated extraction device is required for the anchor pull-out test. The test is therefore always carried out by a specially trained EJOT field engineer with the participation of those responsible for the building. At least 15 tests are carried out on different positions of a building when extracting the anchor. In order to obtain as detailed a building assessment as possible, the tests should be carried out in full on the entire facade – i.e. on all sides if possible – and recorded in a corresponding log.
After the drill hole has been properly drilled taking into account the required drill hole depth, the anchor is set taking into account the (minimum) anchoring depth. This is followed by the actual pull-out test. The extraction device is equipped with special adapters for the respective EJOT products to be tested. The pull-out test is always carried out at a defined and constant speed in order not to falsify the results. This means that the loads are introduced into the anchor by the extraction device and continuously increased until failure occurs. Failure can occur in a wide variety of places, for example in the substrate, i.e. in the actual building material, or in the area of the anchor. The reason for the failure and the load at which the failure occurs are documented in the log.