Stainless Steel Anchor Rod vs Galvanized Anchor Rod - Pros & Cons 1

[oengineer]

What are the benefits of using a Stainless Steel Anchor Rod vs Galvanized Anchor Rod inside of a Lift Station/Wet Well?

The anchor rod is inside of the Wet Well, connecting the wall to the bottom of the slab (see image):

Initially, to me the benefit of using just a galvanized anchor rod is that I can use a higher strength steel (both yield & tensile strength). But the concern is that just using galvanized anchor rods would not be sufficient to resist corrosion due to the constant exposure the anchor rod would have to resist based on what is inside the wet well.

I am trying to determine the best rout to go regarding this connection. Stainless steel seems to have a much lower available yield & tensile strength. But I am not sure if galvanized steel would endure as long as stainless steel.

Comments/suggestions are appreciated.

 

[oengineer]

If this is the caisson method, you should dowel in the wall or provide couplers then pour the base slab inside of the caisson. No reason to have a toe on the base slab.

In order for the wet well to have the type of slab shown in your picture, I would have to extend the seal slab to several feet (for buoyancy requirements) pass the recommended bearing location below grade. Due to the soil conditions, I am unable to do that. This is the reason for the base slab to be extended using a toe.

 

[canwesteng]

Why do you need yield of 100 ksi?

 

[oengineer]

Why do you need yield of 100 ksi?

My goal is to insure that the anchor rods have enough strength to keep the precast riser walls & the bottom slab held together.

A 65ksi yield 95ksi tensile strength would be acceptable as well. I am just wanting to use a yield strength that's greater than 30 something for the stainless steel threaded anchor rod.

 

[bones206]

This table is from ESR-3187 for Hilti's HY 200 adhesive system. If you were to use this product, these would be the threaded rod anchor material you have to choose from. Since your rod diameter is 5/8", you are limited to ASTM F593 (A193 B8 only available as 1-1/4" diameter for if using HY 200 system).

They have some other proprietary anchors available as well (HIT-Z, HIS-N) that have different material strengths.

 

[oengineer]

This table is from ESR-3187 for Hilti's HY 200 adhesive system. If you were to use this product, these would be the threaded rod anchor material you have to choose from. Since your rod diameter is 5/8", you are limited to ASTM F593 (A193 B8 only available as 1-1/4" diameter for if using HY 200 system).

They have some other proprietary anchors available as well (HIT-Z, HIS-N) that have different material strengths.

I have no issue increasing the size of the dimeter (let say to 3/4").

It looks like, for a 3/4" diameter anchor rod, the yield & tensile strength would be 45 ksi & 85 ksi, respectively. That's using the ASTM F593 CW2.

 

[GC_Hopi]

If you have a toe then the sinking caisson need to be jacked up for the base slab to be poured. Thats not an easy task. What the bearing material...can you use tie downs.