River Surfing Wave - Underwater Anchors
River Surfing Wave - Underwater Anchors
(OP)
Hello Everyone,
I am building am adjustable river surfing wave and am anchoring the wave shaping structure to a bedrock river bottom. The river I am in turns off for about 12 hours each day. Currently, the plan is to use Hilti HIT RE-500 SD anchors with 12" embedment provided the anchors pass a few onsite tension pull out tests. The river is just above freezing and the anchors will be fully submerged during installation. The problem is the HIT RE-500 SD have a 72 hour cure time and the river will be cycling on and off a few times. The current plan is to build temporary protection around each anchor to allow it to cure with minimal interference.
Do you know of any good underwater anchoring systems for 0C/32F water that cure in less then 12 hours?
Link to Wave Structure Image
The anchors are for the steel plate platform
Thank you,
Neil Egsgard
Surf Anywhere Project
www.SurfAnywhere.ca
I am building am adjustable river surfing wave and am anchoring the wave shaping structure to a bedrock river bottom. The river I am in turns off for about 12 hours each day. Currently, the plan is to use Hilti HIT RE-500 SD anchors with 12" embedment provided the anchors pass a few onsite tension pull out tests. The river is just above freezing and the anchors will be fully submerged during installation. The problem is the HIT RE-500 SD have a 72 hour cure time and the river will be cycling on and off a few times. The current plan is to build temporary protection around each anchor to allow it to cure with minimal interference.
Do you know of any good underwater anchoring systems for 0C/32F water that cure in less then 12 hours?
Link to Wave Structure Image
The anchors are for the steel plate platform
Thank you,
Neil Egsgard
Surf Anywhere Project
www.SurfAnywhere.ca






RE: River Surfing Wave - Underwater Anchors
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: River Surfing Wave - Underwater Anchors
RE: River Surfing Wave - Underwater Anchors
Why not something like Simpson’s “ Titen HD’s”. There’s no need for a structural epoxy in the hole for strength. Check with them about corrosion resistance and alternating dry and wet conditions. Ask them what would happen if you just greased the holes with a quick curing epoxy at a hole sealing means. Then, just set the base pl. or anchor pl. in a good bed of quick curing epoxy to form a seal and a good bond/bearing surface. You might also set your wave shaping structural system into some shear keys cut into the rock river bed. Most of the loading would be taken by these shear keys, in bearing. Also, consider some soft o-ring/washers btwn. the stl. base pls. and the rock, just to keep rushing water out of this space. How does hydraulic cement work as a base pl. grout in these situations?
RE: River Surfing Wave - Underwater Anchors
You might want to investigate Williams Rock Bolts. They're designed to do what you're planning and they don't use epoxy.
Link
Regards,
DB
RE: River Surfing Wave - Underwater Anchors
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: River Surfing Wave - Underwater Anchors
But you also need to pay attention to the knock-down factors Hilti describes for the cured adhesive mechanical properties when applied to a wet surface. Due to such uncertainties in the mechanical strength of the anchor bolt adhesive, it would be a good idea to use a conservative factor of safety when calculating the number of anchor bolts required to restrain your wave generating device.
Good luck with your project. I grew up in coastal So. California and have surfed since I was 10 years old. Being a die-hard surfer this sounds like a neat idea to me, except for the fact that the water temperature is just above freezing!
RE: River Surfing Wave - Underwater Anchors
Thanks again for the help and feel free to share any other suggestions.
Regards,
Neil
RE: River Surfing Wave - Underwater Anchors