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Old 02-19-2012, 12:04 PM   #1
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Lally column question.


I am adding a I-beam in my workshop for a trolly hoist system. It will only be supporting itself and whatever I pick up, not any of the building. I will be supporting the beam with a single column in the rear (braced to the wall for stabilty) and a pair of columns bridged with a pair of LVL's (lvl specs done by Weyerhaeuser). The lvls will be fastened to the shop walls just to keep them in place, not for load. 3.5" lally columns are way stronger then needed for my small load. In looking around at lally column info I have seen talk about filling the columns with concrete. I can't seem to find out more info on this and when it is needed or why. I know you all stayed at a Holiday Inn Express and have lots of great answers .

TIA

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Old 02-19-2012, 12:38 PM   #2
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Lally column question.


And everyones going to asking exactly what and how much does it weigh that your lifting?

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Old 02-19-2012, 12:41 PM   #3
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Lally column question.


Quote:
Originally Posted by toolferone
I am adding a I-beam in my workshop for a trolly hoist system. It will only be supporting itself and whatever I pick up, not any of the building. I will be supporting the beam with a single column in the rear (braced to the wall for stabilty) and a pair of columns bridged with a pair of LVL's (lvl specs done by Weyerhaeuser). The lvls will be fastened to the shop walls just to keep them in place, not for load. 3.5" lally columns are way stronger then needed for my small load. In looking around at lally column info I have seen talk about filling the columns with concrete. I can't seem to find out more info on this and when it is needed or why. I know you all stayed at a Holiday Inn Express and have lots of great answers .

TIA
They come filled already at any real lumberyard. Whomever spec'd your I-beam should have spec'd the lally column.
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Old 02-19-2012, 12:45 PM   #4
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Lally column question.


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And everyones going to asking exactly what and how much does it weigh that your lifting?
Joe, I am not so much worried about the engineering of my project as much as I want to understand why or why not to add the concrete.

But since you asked, the beam weighs 720 lbs. It will be a 2000 lb (double line) electric hoist on a trolly. Most of my lifting will be far lighter then that and it will be a light use tool. It just seems that every project I work on I ned to borrow a person to help me lift it off my work table or such.
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Old 02-19-2012, 12:51 PM   #5
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Lally column question.


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They come filled already at any real lumberyard. Whomever spec'd your I-beam should have spec'd the lally column.
Well, see I already learned something. Thx.

I have not had the project engineered yet. I got the beam used from a hobby auto shop that was using it for the samething. I got their engineering drawings to start my process. I have a me friend that is going to look at my setup.
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Old 02-19-2012, 01:31 PM   #6
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Lally column question.


You don't fill them yourself. They come filled with concrete if needed. All column will have a rating of the carrying load. Just get ones that can carry your loads which sounds like about 1500 ponds each would be plenty. I don't think you could even find a column less than 5000 pounds.
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Old 02-19-2012, 02:02 PM   #7
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Lally column question.


Lally columns are usually (not always) filled with concrete in order to increase the vertical load capacity of the column. The capacity is increased because the concrete acts to increase the polar moment of inertia of the column, which reduces the tendency of the column to buckle. Additionally, the concrete is typically quite strong in compression, hence the concrete adds compressive strength to the assembly. By using low cost concrete to fill the pipe, the manufacturers can use thinner steel for the walls, which is typically more expensive than filling with concrete.

The concrete is claimed to add fire resistance to the assembly. I am not clear how much fire resistance the concrete adds. In a fire, the steel will certainly soften and will buckle at relatively low load (see the horrific consequences of steel softening due to heat in the collapse of the World Trade Center). The presence of a core of concrete may provide adequate residual capacity to support the load even if the steel fails.
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Old 02-29-2012, 08:07 AM   #8
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Lally column question.


You can check out our website www.deancolumn.com
We make concrete filled steel columns "Lally Columns". If you have more questions please feel free to contact me. Thanks.

David

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