Anchoring Threaded Rods to Concrete Pool: Advice Needed

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SUMMARY

This discussion focuses on anchoring a timber ledger to a concrete pool using 10mm stainless-steel threaded rods at 900mm centers, utilizing Ramset polyester adhesive. The adhesive requires a 90mm hole depth for optimal strength, but the engineer restricts drilling to 70mm due to reinforcing bars positioned 75mm from the shell. The user seeks advice on whether to adjust the spacing of the rods to maintain structural integrity or if the situation requires a more complex solution.

PREREQUISITES
  • Understanding of concrete anchoring techniques
  • Knowledge of polyester adhesives, specifically Ramset products
  • Familiarity with structural engineering principles related to reinforcement bars
  • Experience with drilling tools and techniques for concrete
NEXT STEPS
  • Research the properties and application methods of Ramset polyester adhesive
  • Learn about concrete cover meters and their use in locating reinforcing bars
  • Investigate structural implications of reducing anchor spacing in concrete applications
  • Explore best practices for drilling into concrete while avoiding reinforcement bars
USEFUL FOR

This discussion is beneficial for contractors, DIY enthusiasts, and engineers involved in construction projects that require anchoring techniques and an understanding of concrete reinforcement.

jack in oz
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Hi All,
my first post on this fantastic forum.

I am attaching a timber ledger to a concrete pool with 10mm stainless-steel threaded rods at 900mm centres. I am using a polyester adhesive made by ramset to anchor the rods into the concrete. The adhesive instructions call for the rod to be embedded in a 90mm deep hole. However, the engineer who designed the pool will only allow me to drill 70mm deep because the reinforcing bars are embedded 75mm from the outside of the shell.

My question is: do I simply reduce the distance between the threaded rods by the ratio 70/90 (i.e. 700mm centres) to achieve the same overall strength, or is it more complicated than that?

Appreciate any advice.

Regards,
Jack
 
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You can hire bar locater probes to find the spaces between the bars and drill deeper there.

Look up 'concrete cover meter' in you local YP.
 
thanks Studiot, I'll look into it.