Straightness of Monorail Beam

[structuralnuke]

We have a monorail beam (S15x42.9) which has some local deformation of the bottom flange. The trolley has four wheels but is only driven by two of these geared wheels. The deformation is only about 1/8" (vertical); but it is enough that the trolly drive wheels can lose contact with the bottom flange of monorail, and therefore trolley is stuck in place.

Anyone have any experience with straightening of this type? AISC Steel Construction Manual allows heating of normal steel section to 1200F to allow straightening, not sure if crane rails are different. Broused thru CMAA-70 and didn't seen any mention.

 

[MiketheEngineer]

Can you "grind" out the flaw?? or fill with welding or maybe even epoxy??

 

[structuralnuke]

Not sure about grinding, it is an option just not prewheels to seeferred. I've asked shop to re-align trolley wheels to see if it lessens issue. I had also thought about using one of the belzona ceramic metal products to level.
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[GregLocock]

Slightly off topic, but do you know why they're bent? Seems like you could add a doubling strip along the entire length to prevent recurrence AND solve the current issue in one hit.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[21121956]

Hello everybody:

If you decide to perform a welding, possibly this document can be of some help to you.

http://www.wtia.com.au/pdf/TGN-BC-05 Repair Welding of Crane Rails .pdf

Good luck!

El que no puede andar, se sienta.

 

[structuralnuke]

Greg,

The bent part in rails appears to be a fatigue/wear issue. The deformation is in the area of most use, a specific location which it often services one paticular piece of equipment.

21121956, Thanks for the document i will review.

 

[MiketheEngineer]

Might need to be replaced with something a bit stronger

 

[byrdj]

deformation of a piece of rigging equipment should raise a flag.

 

[MiketheEngineer]

That's basically what I am suggesting agreeing with byrdj