Hi there,
I hope you can confirm the correct product combination has been used in the scenario provided below.
I am currently working on designing an equal angle support to bear a reinforced concrete member above. The EA support will be anchored on a reinforced concrete wall using M20 SS threaded rods with Hilti HIT HY 200-R V3 HAS-U 100. YEARS. The angle is also made from stainless steel to avoid dissimilar metal induced galvanic corrosion. The support and the concrete member bearing on top will be submerged under the water from time to time and the chemset will be under permanent tension.
Could you please confirm if it is right product to use or you have a more optimal product combination to recommend?
(I have checked the design action against the anchor capacity- approximately 85% utilisation).
Hello Junwei,
Thank you for reaching out to Hilti.
First of all, if your drilled holes are not submerged/water filled during the time of installation, then HIT HY200-R V3 can be used, given that the adhesive has been cured before submerging. However, if your holes are going to be submerged during the installation then please select HIT RE500V3 instead of HIT HY200-R V3. This is because based on our internal testing we have data for installing this adhesive in submerged holes as well.
If you are looking for a complete solution, we also have HAS-U rods available in stainless steel.
Secondly, while doing the design for anchors which are in permanent tension, I would suggest you to apply a sustained load factor into your design. If you are using Profis Engineering for this design, you will see a dotted blue line in z - direction where you can add your sustained loads/permanent tension loads. Other than that, if you are doing manual
calculations, please consider a reduction factor of 0.7 into account. The reason being, water saturated concrete will have less mechanical strength than dry concrete. Hence, the lower mechanical performance of water saturated concrete and the behaviour of bonded systems in such base material must be
taken into consideration when designing underwater fastenings.
Lastly, please note that if the holes are submerged during installation you will have to use hammer drilling as your method of installation along with piston plugs (HIT-SZ) for adhesive installation.
Hope the above helps. If you would like to learn more about installations in submerged holes, please contact our engineering team >> here.
Kind Regards,
Ask Hilti Team
Australia