Lolly / lally columns, where to buy? 2

[COEngineeer]

So I helped my inlaws designing extra support for their flat roof garage. Their roof was built with 2x10 @ 12" o.c. long ways!!! (25 ft) yikes! So I am telling them to get (3)-1 3/4x14 LVL and break the span in half and maybe use lolly column on ea. side and bear it on existing slab & footing. Where can I buy lolly columns? I want one with saddle at least 5 1/4" wide so I can brace the LVL. I googled it and had no luck.

http://www.swijetty.com

Sea Water Intake and Jetty Construction

 

[jike]

Lally columns are used normally for special fire rated application in commercial construction. They are fabricated by Dean Lally / Fire-trol in Joliet, Illinois.

I would think that all you need would be an adjustable jack post pipe column that you can purchase at almost any local home center. Your other option is to have a structural steel fabricator fab up a pipe column with a steel saddle to your specifications.

 

[COEngineeer]

Thanks jike, I didnt know they were 2 diffrent things. What do you think my other option if I put (3)-1 3/4x14 LVL dropped beam underneath the 2x10s? Do you agree I need to have a saddle and lag screw it from the side? Do I have other option so I dont need to fabricate anything? This is what I found from homedepot.

http://www.homedepot.com/webapp/wcs...langId=-1&catalogId=10053&productId=100022783

http://www.swijetty.com

Sea Water Intake and Jetty Construction

 

[Lion06]

COEngineer-
Is the saddle and lag screw from the side just to consider it braced at the ends? If so, can you just install a Simpson A21 or something similar from the 2x10's bearing on the LVL to the top of the LVL?

 

[COEngineeer]

Yeah, I might have to go that route. Kinda hard to swing a hammer in 2x10 @ 12" o.c. joist space. Dont think he has a nail gun either. OK, thanks guys! If you have other ideas let me know.

http://www.swijetty.com

Sea Water Intake and Jetty Construction

 

[DarthSoilsGuy]

who was it that started calling all round HSS steel columns "lally columns"? was it the residential architects and the SEs followed suit to talk down on their level, or was it the contractors that started this. (spoiler alert: the architects did it)

seriously, the "lally columns" i've seen in residental construction are the adjustable jack post pipe columns (calc a 3.5" Sch 40) like jike is talking about. The fabrication your looking for is either standard or it should be because it's designed a lot.

If you go with adjustable columns, i'd look into anchoring the threads with concrete at the base.

 

[COEngineeer]

Yeah, we will definately achor it.

http://www.swijetty.com

Sea Water Intake and Jetty Construction

 

[jike]

If you drop the LVL's under the 2x10's, I would use a saddle on the column with thru bolts into the LVL's for column stability.

 

[Lion06]

couldn't you just fasten the plate at the top of the lally column to the underside of the LVL?

 

[COEngineeer]

Then you would have a hinge on top of the column, thats all. I think without the saddle is sufficient, but I think saddle would really prevent the beam from tilting and sliding.

http://www.swijetty.com

Sea Water Intake and Jetty Construction

 

[Lion06]

I am sorry, I should have been more clear. I meant fasten the plate at the top of the column to brace the column, not the beam. I would still use the A21 clip to brace the beam.
Now that I think about it more, I am not sure the saddle with a lag screw/bolt through the LVL will brace the LVL without something from the 2x10 to the LVL unless you have a different means of bracing the column.
I agree that the saddle with lag is probably the way to do, but still use something to brace the top of the LVL to the 2x10's.

 

[samdamon]

COE Couple suggestions-I don't know what the forces are in your posts but look into using parallam columns. There are several sizes available as well as prefab metal top and bottom post connectors that could work with your new girders, thus eliminate the need for lally's.

Also see article in "Structure" magazine Sept 2004, page 16, has load tables for Lally posts.

 

[COEngineeer]

but it is kind of hard to use LVL columns when the roof is already up. You have to shim it to have exact fit.

http://www.swijetty.com

Sea Water Intake and Jetty Construction

 

[PEinc]

Ok, now how about the foundation for the column? I would not found the column on the slab. It may be only 2 or 3 inches thick. You really should break a hole through the floor, then dig and pour a footing of proper size.

I just had a home appraiser make a big stink because someone did what you are proposing and did not put a footing under the column. The sale of the house now depends on the owner fixing his DIY screw adjustable column.