What conditions affect the safety factors of
chemical anchors
1. The cleaning of dust in the hole has a great influence on the chemical anchor. If the performance of the chemical anchor during standard cleaning (vacuum cleaner, brush) is 100%, then the performance of the chemical anchor is only 70% when the spare vacuum cleaner is used. When the spare brush is used The performance of
chemical anchors is only 50%.
2. Affected by the state of the hole, if the performance of the chemical anchor is 100% when the hole is dry, then the performance of the chemical anchor is 80% when the hole is filled with water, and the performance of the chemical anchor is 100% when the hole is wet. .
3. Excessive stirring has a great influence on the anchoring strength of the chemical anchor bolt. The bolt must be marked with a depth of burial. When the bolt mark reaches the hole surface, it should be stopped in time. Otherwise, over stirring for 5 seconds, the anchoring force will only reach 97%, over stirring for 10 seconds, the fixation force will only reach 77%, over stirring for 15 seconds, the fixation force will only reach 67%.
4. The larger the hole diameter is, the more the drawing load will be significantly reduced, so the hole diameter must be carried out according to the data provided by the manufacturer.
5. Impact on
chemical anchors when embedded in concrete through asphalt layer. Since the asphalt contains a resin superposition inhibitor component, it will hinder the hardening of the resin. When cleaning the concrete dust after drilling, it is also necessary to clean the asphalt dust. When drilling holes, the thickness of the asphalt should be deepened into the concrete part.
6. The effect of honeycomb holes on chemical anchors during drilling operations. The following processing must be done. The position movement will not affect the original hole, move to another position to continue drilling. Repeat the stirring, insert the specified chemical anchor bolt, embed it with a screw of specified diameter, pull out the screw immediately after stirring, insert a chemical anchor bolt again, embed and stir the screw again until the resin mixture overflows to the vicinity of the orifice, Stop the construction and mixing action immediately.
7. The impact on the chemical anchor when it is deeper than the reference embedding depth. In the case of deeper than the standard embedding depth, because the amount of resin is necessary, it is necessary to use more than two
chemical anchors.
