Underhung Monorail crane
Underhung Monorail crane
(OP)
I am getting no help from the trolley manufacturer- so I would appreciate input here
I am designing a simple monorail beam for a 2 ton underhung crane. The beam will be over 100 feet long, so it will need a splice. The manufacturer indicates that the beam width must be between 3.5" and 5.5" wide. Since we have a splice, I am thinking that I need to add the width of the splice plates and bolt heads to the 3.5" minimum requirement. I am looking at 1/4" plates on both sides of the web, with 5/8" dia. bolts- overall width = 1.5". Does it make sense that my beam needs to be 3.5" min + 1.5" splice = 5" min width?
The other option is to use welded splices- but I believe that runs the risk of warping the steel and possibly cause operational issues with the trolley. Does that sound accurate?
Thanks in advance
I am designing a simple monorail beam for a 2 ton underhung crane. The beam will be over 100 feet long, so it will need a splice. The manufacturer indicates that the beam width must be between 3.5" and 5.5" wide. Since we have a splice, I am thinking that I need to add the width of the splice plates and bolt heads to the 3.5" minimum requirement. I am looking at 1/4" plates on both sides of the web, with 5/8" dia. bolts- overall width = 1.5". Does it make sense that my beam needs to be 3.5" min + 1.5" splice = 5" min width?
The other option is to use welded splices- but I believe that runs the risk of warping the steel and possibly cause operational issues with the trolley. Does that sound accurate?
Thanks in advance






RE: Underhung Monorail crane
And, yes, you should bolt splices--not weld. Fatigue is an issue with welding splices.
DaveAtkins
RE: Underhung Monorail crane
RE: Underhung Monorail crane
http://www.jettools.com/us/en/p/2-hdt-2-ton-manual...
RE: Underhung Monorail crane
I typically show the beam splice cut at 45 deg (in plan) so that the wheels don't fetch up on the gap in the bottom flange on both sides at the same time.
RE: Underhung Monorail crane
RE: Underhung Monorail crane
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Underhung Monorail crane
Anyway - one option is to find a different trolley hoist.... - they can be ordered up to 12" flange width if a chain hoist & maybe 15" if wire rope.. note that I do not like to sue lighter capacity wire rope hoists.. two easy fro small dia rope to pull out of drum grooves.
I disagree with fatigue concerns ref welded splice .. assuming the splice is located in line with a support
we often weld the bottom flanges together because the flanges are often rolled differently due to mill tolerance for flange roll (tip),,,
I suggest you review how the patented track people resolve some of these challenges...
I've pasted a link to one of their brochures
http://tcamerican.com/files/Perfect%20Beast.pdf
BTW - what lateral force are you applying for beam design?
regards