We are designing a cable bracket to support several electrical cables in a mine. It needs to be anchored into rock, not concrete. The end user has requested to use 3/4" wedge anchors. After searching online and Hilti's website, we see that Hilti does not recommend wedge anchors for rock and instead recommends an epoxy anchor, HIT-RE 500 V4. Could you help us with a few questions:
- Why would the epoxy anchors be recommended over the wedge anchors? Looking for justification since the end user wants to use wedge anchors.
- Could you provide any guidance on specifying embedment length? We would require threaded rod to be used with the epoxy.
We will likely specify pull test requirements, at least to test the design in the rock. Our estimated loads on the anchors are also relatively low, ~50 lbs tension and ~220 lbs shear.
Any advice would be greatly appreciated.
Hello Adam,
Thank you for contacting Hilti Engineering.
Hilti does not have test data available for installing anchors into natural stone/rock because of the variety of stone properties. However, you can reference the attached University of Catania (Italy) 2014 study on the behavior of post-installed adhesive anchors in natural stone.
We have seen HIT-RE 500 V3 considered for applications into natural stone in the past and we share the study to help in the process of making an engineering judgement on the application.
To make things convenient for you, I have also linked our product technical data below for your review:
- HIT-RE 500 V3:
- Technical Data for this slow cure epoxy adhesive anchor starting on Page 106, Canadian data starts at Page 139.
- ICC-ES ESR 3814 and ICC-ES ELC 3814 for anchoring into concrete
Unfortunately, Hilti Does not offer design services for anchors at the moment, however, we offer a design software PROFIS Engineering where you can model your application using Hilti anchor portfolio and simulate the design resistance in real time before printing the design report. Please keep in mind that the software currently only includes concrete and masonry as base materials.
Please feel free to contact us if you have any further questions.
