Blind bolts

[bluedog225]

Good morning.

I’d like to bolt **** hinges to a 24’ piece of 4” square tubing on 24” centers.

I’ll be attaching 12’ H-beams for a solar project.

Everything is hot dipped so I’d rather not weld.

Can anyone recommend a type of structural bolt that takes up like a drywall expanding anchor for this application?

Many thanks

 

[bluedog225]

Generally like this (internet pic not mine)

 

[firebirdparts]

Nut-sert is all I know. https://www.fastenal.com/product/details/0125617

 

[rancherbill]

Rivet Nuts

https://www.amazon.ca/dp/B07BFVCSNP/?tag=atomicindus04-20

 

[ycgoat]

Even those nut-certs are nice I don’t think they are structural fasteners (I am no expert). You may want to verify the load capacity will be enough for your needs

 

[strutaeng]

Weld threaded rod to the tubes, then go over the welds with cold galvanizing compound. They sell hot dipped galvanized threaded rod.

 

[cvairwerks]

Weld the nuts to an "X" that is just small enough to fit in the tube. Use a string to pull into the location, add adhesive and magnet to hold in place. Thread in bolt when adhesive is cured.

 

[manwithtools]

Even those nut-certs are nice I don’t think they are structural fasteners (I am no expert). You may want to verify the load capacity will be enough for your needs

Rivnut Pull Out Strength

 

[nadogail]

I have found some very nice fasteners that were made by Hilti.

 

[RPH]

Uni-strut should have suitable pieces available.

 

[wssix99]

I would:
1) Get a weldable hinge and weld it.

If not, then I would:
2) Use a pop rivet.

If you are using off-the-shelf hinges with counter-sunk holes, then I would:
3) Get countersunk blind rivets: https://www.mscdirect.com/browse/tn...QUvtmRoCE4oQAvD_BwE&mkwid=|dc&cid=ppc-google-

 

[ycgoat]

Rivnut Pull Out Strength

Whoop there it is, now all he needs is the load when the wind blows on the panels

 

[Grimpala]

How are you going to protect the holes that you drill in the galv tubing?

 

[bluedog225]

Wind load on the vertical side of the conex would be around 7000 lbs at 70 mph. From memory and if I calculated correctly (unlikely).

I’ll protect the holes with cold galvanize or if ambitions, melt a zinc stick on them.

 

[Jacko264]

Mono bolts are very good there like big pop rivets or
daisy bolts they open up inside the box like a you got it a daisy
the only thing is you will have to buy or hire a gun to use this type of fitment
Graham

 

[jbfsr]

Make a tapped backing plate with the hole pattern of the hinges and slide it in.

 

[Jacko264]

How thick is the box section wall if 6mm you could taptite screw the hinges on just drill the correct hole and the taptite makes it’s own thread
Graham

 

[bluedog225]

I’ve not purchased the piece yet. I’m guessing 0.25 is as thick as I’ll find locally.

Sliding backing plates down 12’ seems impractical.

 

[jack stand]

Can you through bolt?
What are the hinges supporting and what type of hinge?
They are semi crude, but they make good hot dipped galvanized gate hardware long enough to go through telephone poles.