Difference between level plate and temp plate

[Veer007]

Hey guys, what's the difference between leveling plate and temp plate at steel column base, can anyone assist me?

Thanks in advance!

 

[klaus.]

Question is not clear to me...what do you mean ??
maybe a sketch or picture

A steel column usually has a base plate at the end...maybe some shim plates too for tolerance

 

[Veer007]

Below is the images shown you clear details,i need to know the difference between them

Thanks in advance!!

 

[Veer007]

Could you able to see now?

Thanks in advance!!

 

[Ron247]

Based on the bolt type shown it appears the 1st picture temp plate is a leveling plate because it has leveling nuts under it. The nuts may be used to level the plate before the column is set.

The 2nd picture leveling plate is manually leveled without any bolts and later it looks like epoxy anchors or cinch anchors are then used to attach the column base plate.

Both plates appear to be leveling plates with different leveling procedures.

 

[Ron247]

The 3rd picture is also leveling plate that is manually leveled since there are not leveling nuts.

 

[Veer007]

apologies, i deleted the second one, and added new one.

Thanks in advance!!

 

[Settingsun]

Could 'temp plate' actually be 'template' but someone has typed it wrong? Looks to me like it's meant to keep the anchor bolts in the right place during concreting.

Or temporary plate, same conclusion.

 

[Settingsun]

Turns out these plates are used for levelling by some people.

https://www.eng-tips.com/viewthread.cfm?qid=300734

I don't see that this addresses fabrication tolerance in the steelwork but does even out the concrete surface. Half a solution?

What does the first detail achieve? Leveling plate below the grout.

 

[klaus.]

a temp plate is a temporary plate for setting in the anchor bolts at the time the concret gets poured
can be a thin steel plate or anything else....it is usually not structuraly interesting

 

[BAretired]

The only temp plates I have seen are made of plywood and are secured to the forms. Their purpose is to set anchor bolts in accordance with the drawings and to hold them precisely in place during the placing of concrete. The plywood is removed before setting the column and base plate.

Leveling nuts sound like a good idea, but do not seem to be favored by most erection crews who seem to prefer steel shim plates for leveling. Shims are kept in place during and after grout is placed.

BA

 

[Veer007]

Hey guys, whats the purpose of template being located below grout?

Thanks in advance!!

 

[Ron247]

If it is a steel plate, I think it is just easier to leave it than to remove it. Wood templates get removed.

 

[BAretired]

In over fifty years of practice, I have never seen a steel template located below grout. I have no idea what its purpose might be. It is certainly not a common detail.

BA

 

[KootK]

Leveling nuts sound like a good idea, but do not seem to be favored by most erection crews who seem to prefer steel shim plates for leveling.

This seems to be regional. I got started in the midwest US and only saw leveling plates. Then, when I moved to Alberta, I pretty much only saw shim stacks. I'm torn as to which I prefer:

- to this day, I don't understand how one grouts around a bunch of loose-ish shim stacks and feels good about the bearing condition. It all just seems so messy to me compared to just solid grout, particularly if there's shear transfer in play. And it's not as though the shim stacks are ever going to match the base-plate inclination exactly.

- The leveling plate has the obvious concern about base plate and anchor bolt suitability prior to grouting. As you know, contractors tend to get a fair bit built prior to circling back for the grouting at times.

 

[Ron247]

I have never seen one either. Most setting templates are wood because of cost and they get removed. I could envision someone using steel templates and then just leaving them but have never actually witnessed it.

 

[BAretired]

- to this day, I don't understand how one grouts around a bunch of loose-ish shim stacks and feels good about the bearing condition. It all just seems so messy to me compared to just solid grout, particularly if there's shear transfer in play. And it's not as though the shim stacks are ever going to match the base-plate inclination exactly.

If liquid grout is used, there should be a hole in the base plate for the grout to daylight; in that case, the grout should flow around the shim stacks. But if it's dry-pack grout, I agree it would be difficult to cover 100% of the area of base plate.

BA

 

[dhengr]

Veer007:
There’s a 50-50 chance that the two details are just very poorly drawn, because the duffus who did them had a CAD program, but no knowledge of what he was doing. Once you can CAD, you can draw most anything, buildable or not. I’ve seen templates used fairly often on large industrial jobs, where there are many AB’s in a fairly complicated arrangement, with some degree of tight tolerances.

 

[BridgeSmith]

Kootk, almost all of our installations, from traffic rails to high mast light towers, utilize leveling nuts. The high mast light towers don't get grouted, just an expanded metal screen between the base plate and the top of the concrete to keep the critters out.

Functionally, it would seem that the amount of axial load should have the greatest influence on whether to have the base plate bear on a grout pad or rely on compression in the bolts. For small axial loads (relative to the moment), having the bolts carry all the tension and compression (through the leveling nuts) is fairly efficient, since the compression is not significantly different in magnitude than the tension. If you have significant axial load, and not much moment, it's going to be far more efficient to have the grout pad to carry the much larger compression force to the foundation.