Those of you who know about fastenings

[gurrre]

I am going to install a road barrier and cast a foundation for the foot of the barrier.

The load is that the barrier moves back and forth and that someone might want to sit at the end of the barrier for fun.

I wonder if there is any difference between casting and then drilling holes and then cleaning them thoroughly with a blow pump and then using anchor compound and threaded rod versus just pushing the threaded rods into the wet concrete before it has set?

 

[Isakare]

Directly in the concrete is definitely the most sustainable.
But make a template with the holes and slip it over so they stay in place, e.g., from a piece of plywood.

 

[Plupp 405730]

I am going to install a road barrier and cast a foundation for the base of the barrier.

The stress involves the barrier moving back and forth and someone potentially wanting to sit at the far end of the barrier for fun.

I wonder if there's any difference between casting and then drilling holes and cleaning them thoroughly with a blow pump before using anchor adhesive and threaded rods, compared to just pressing the threaded rods into the wet concrete before it sets?

It is cheaper to cast them in and easier if you only have the hole placement from the barrier. I usually drill holes in a board or plywood with the same hole spacing as the base of the barrier to fix the threaded rods before casting.
Drilling and injecting works, but it's more expensive with the anchor adhesive and takes longer to execute before you can mount the barrier.

 

[gurrre]

Exciting, I've heard the complete opposite before. That nothing beats anchor adhesive.
And that it can crack and that the concrete shrinks around the threaded rod.

We'll see if we get more answers.

 

[Plupp 405730]

Exciting, I've heard the exact opposite before. That nothing beats anchor mass.
And that it can crack and that the concrete shrinks around the threaded rod.

We'll see if we get more answers.

It holds with anchor mass...

In larger constructions with steel columns, etc., injection fastenings are not approved...

 

[gurrre]

It holds with anchor mass..

In larger constructions with steel columns etc., injection fastenings are not approved..

Do you cast it directly into new concrete then?

I'd rather do that, it's much faster to make a template and then go for it.

 

[Plupp 405730]

Do you cast it directly into new concrete then?

Then I might as well go with that, it's much quicker to make a mold and then go for it.

Yes, you fill your mold that you will cast in with concrete, vibrate the concrete, and then lower the entire fastening package into it. Once you are satisfied with the positioning, tap a little on the threaded rods with a hammer so that the concrete closes around them.

A reinforcement tip is to thread one or a couple of nuts onto each rod, which makes it impossible to pull them up.