Chemical Fastener 3

[dik]

I'm looking to secure threaded rod from the underside of a concrete bridge deck for hanging 3"Ø fiberglass conduit. The hanger depth will be less than 12" to the bottom and it is nestled next to a concrete beam. Environmental loading from wind and snow will be minimum. The load from the conduit will likely be less than 30 pounds (I will include design for ice loading).

I'm looking at using a chemical fastener that will accept a 3/8" dia or 1/2" dia UNC or UNF threaded rod. It appears that the Hilti HIS RN 316 fastener will work, but I've been unable to obtain technical information about it.

Is there an alternate faster that can be used to secure threaded rod? Can a KB1 be used and instead of using the supplied bolt, can a threaded rod be used in lieu of it after it has been tightened? Do they use standard UNC or UNF threads?

I'm thinking of something like this (all SS):

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dvd]

Be aware of selecting epoxy anchors rated for overhead use -

Boston Tunnel Failure

The attached lists Hilti anchors rated for overhead use.

 

[EdStainless]

And beware of using 300 SS for overhead work as well.
Any salts (road or environmental) will lead to SCC failures.

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P.E. Metallurgy, consulting work welcomed

 

[dik]

I remember the Big Dig failure... thanks.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dik]

Thanks, Ed... Is that chloride salts? or salts in general?

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[azcats]

If you're willing to go mechanical, the Simpson Titen HD has a threaded rod hanger version.

[URL unfurl="true"]https://www.strongtie.com/mechanicalanchors_mechanicalanchoringproducts/thd-rh_anchor/p/titen-hd-threaded-rod-hanger[/url]

Nevermind - dry interior only.

 

[dik]

Thanks azcats... I was planning chemical... my preference... but will take a look at mechanical. Before coming across the Hilti chem fastener, I was thinking about using KB1s and using a threaded rod in lieu of their bolt... just using the bolt to set the wedges...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dik]

Heck, if needed and possible, I'd have it HDG and used it.

I knew chlorides are a problem with SS, but not as much as has been shown. Currently waiting on the salts they use and will likely use HDG or if I have to, fiberglass...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[CrabbyT]

HILTI HIT-HY 200 + piston plugs (HIT-SZ or HIT-IP) should work. Check out section 5.22 of the ESR linked below.

https://www.hilti.com/media-canonical/ASSET_DOC_16368681_APC_RAW

Here's a link to the HILTI site for HIT-HY 200.

https://www.hilti.com/c/CLS_FASTENER_7135/CLS_CHEMICAL_ANCHORS_7135/r11219549

Simpson also makes several adhesive anchors that would probably work.

https://www.strongtie.com/adhesives_anchoringsystems/category

 

[dik]

Thanks Crabby...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik