Beam for hoist

[Bobbarebygg]

Hello
I need to install an 18-meter beam for a hoist weighing 2.5 tons or alternatively 3.2 tons.

Can anyone help with calculating what beam I need? The idea is to attach one side to existing steel columns for stability, and at each end of the beam, columns to the floor.

So some type of ipe or hea

 

[hawk1ye]

Have I understood correctly that you wish to fix it at each end and have a span of 18 meters?

To achieve an approximately acceptable deflection (L/300), you would need a HEB300, which would cost a fortune. You should really consider attaching the beam at more points if you plan to have such lifts.

 

[Bobbarebygg]

Yes, it's quite a long span, there are truss rafters in steel above the intended beam, running crosswise. I think it's 6m between them if I remember correctly, but it might be difficult to figure out how much extra weight they can handle 🤔

 

[hawk1ye]

It's not very difficult, but it would help to have more information about your conditions. Right now it feels a bit ill-considered since you mention 18 meters but haven't considered that you would need to splice such a beam, as it's not normally stored in such lengths unless you special order it, which sounds expensive.

I would look at the walls to see if it's possible to place two beams on some bearing line/ridge beam/standing studs that in turn support the lift beam, thus reducing the span and making it easier to splice the beam.

 

[Workingclasshero]

I probably have 12 meters at work, and it's probably a 600 beam. At home, I have 8.4 meters and a 240 beam, but then it supports the trusses' ridge beam/floor.

You need to explain the conditions better.
/W

 

[Bobbarebygg]

It's not very difficult but it would help with more information about your conditions. Right now it feels a bit thoughtless as you say 18 meters but you haven't considered that you would need to splice such a beam since it's not normally stocked in such lengths unless you special order which sounds expensive.

I would look at the walls if it's possible to place two beams on a load-bearing line/hammer band/upright studs that in turn carry the lift beam, thus reducing the span and easing the splicing of the beam.

I know that it's possible to order 18 meter lengths so that's not a problem there, yes I'll have to think about if it's possible to support it somewhere, I want to avoid more columns in the middle of the room.

I just checked, it wasn't very expensive with a HEB 300 18.1 meters. But you mean it would work for a 3.2-ton hoist?

 

[Bobbarebygg]

I have about 12 meters at work, and it's probably a 600 beam.
At home, I have 8.4 meters and a 240 beam, but it supports the rafters' collar ties/floor.

You need to explain the conditions better.
/W

Okay.
I also have an 8m beam at home, but I haven't calculated anything there; I just used a 300 beam that was left over, but I only have a 500kg hoist there.

 

[Karrock]

The roof should handle the design snow load for Norrbotten. In my own workshop, I would also hang things from the rafters and avoid lifting heavy things when there's the most snow.
If there are employees moving around in the premises, you can't think that way.

 

[Bobbarebygg]

The roof should withstand the design snow load for Norrbotten. In my own workshop, I would hang from the rafters too and avoid lifting heavy objects just when there's the most snow.
If there are employees moving around in the premises, you can't think like that.

Yes, I want to avoid making any weakening in the roof, partly because there is staff moving around there and partly because it is a rental premises, so I want to avoid harming people and the premises.

 

[hawk1ye]

I know it is possible to order 18-meter lengths, so that's not a problem. I will have to think about whether it is possible to offload it somewhere, as I want to avoid more pillars in the middle of the premises.

I just checked, and it wasn't very expensive with an heb 300 18.1 meters.
But you mean that it would work for a 3.2-ton hoist?

Yes, it would work, but the deflection on an HEB300 is 72 mm with a load in the middle of 31.2 kN.

Which gives 18000/72=250, which is less than what I can personally recommend.

HEB360 would be better if you want 3.2 tons capacity with some margin, at least. It gives a deflection of 42 mm. I rarely deal with the construction of lifting beams, but those I've seen used L/500 in their protocols, so it can be a hint, and at 42 mm, we are at 18000/42=428, so sufficiently close for "home use".

 

[Bobbarebygg]

Yes, that would work, but the deflection on an HEB300 is 72 mm with a center load of 31.2 kN.

Which gives 18000/72=250, which is slightly below what I personally can recommend.

HEB360 would be a better fit if you want a 3.2-ton capacity with a little margin, at least. It gives a deflection of 42 mm. I rarely come into contact with the construction of lifting beams, but those I've seen have used L/500 in their protocols, so it can be a hint, and at 42 mm we have 18000/42=428, which is close enough for "home use."

Okay, thank you for the answer, is there a simple way for me to calculate the deflection in each beam if I choose to use, for example, a 2.5-ton hoist?

 

[hawk1ye]

Okay, thanks for the reply. Is there an easy way for me to calculate the deflection in each beam if I choose to use, for example, a 2.5 ton hoist?

In this case, you can simply think that 2.5 tons is 78% of 3.2 tons. Which results in 56 mm for an HEB300 and 32.8 mm HEB360, with a load of 2.5 tons.

 

[Granngubben]

In this case, you can simply think 2.5 tons is 78% of 3.2 tons.
Which becomes 56 mm for an HEB300 and 32.8 mm HEB360, for a load of 2.5 tons.

Deflection caused by the beam's own weight should also be included in the calculations!
It becomes 30 mm for HEA300 and 21 mm for HEA360 (freely supported on two supports, span 18 m).

A crane beam should also be checked for local stresses from the crane's wheel loads.

 

[hawk1ye]

Deflection caused by the beam's own weight should also be included in the calculation!
It will be 30 mm for HEA300 and 21 mm for HEA360, (simply supported on two supports, span 18 m).

A trolley beam should also be checked for local stresses from the trolley's wheel loads.

Exactly right, good that you added that! Which suggests that it will be a substantial beam, surely at least an HEB360 at the lower weight.

 

[Granngubben]

I think a stronger beam is needed, 18 meters is a very large span. Consideration also needs to be given to buckling, local stresses and relevant deformation requirements, fatigue, etc.

There is a handbook for the design of crane runways, see:

https://www.sbi.se/produkt/telferbana-handbok-for-dimensionering-av-telferbanor/

There is certainly a lot of useful information in it.

PS. In my previous answer it says "HEA". It should be HEB!.