Crane Design Information
Crane Design Information
(OP)
Anybody have information regarding ASCE rail design for crane end truck wheels? I have a crane (50 metric tons), span = 118 feet, bogie end trucks (4 wheels, 20" dia), wheel load is 50 kips. I have an old Whiting Crane Manual that discusses rail design based on a formula:
D x W x 1400 (Class D)
D x W X 1200 (Class A-C)
D = wheel diameter
W = width of top of crane rail
1400 or 1200 = ????
The width of the actual wheel on the end truck is 3 inches while sitting on a ASCE 60# rail (1.25 inches wide) at the top of the rail.
Is this too much tolerance? Is a 60# rail too small? Please advise.
Thanks,
alumpkin
D x W x 1400 (Class D)
D x W X 1200 (Class A-C)
D = wheel diameter
W = width of top of crane rail
1400 or 1200 = ????
The width of the actual wheel on the end truck is 3 inches while sitting on a ASCE 60# rail (1.25 inches wide) at the top of the rail.
Is this too much tolerance? Is a 60# rail too small? Please advise.
Thanks,
alumpkin






RE: Crane Design Information
RE: Crane Design Information
Dik
RE: Crane Design Information
RE: Crane Design Information
An ASCE 60# rail has a head width of 2 3/8", not 1 1/4".
RE: Crane Design Information
True the head width for an ASCE 60# rail is 2-3/8", the flat part at the top less the radius' is only 1.25 inches. That is what is shown in the old Whiting Crane Design manual as well.
I was looking for someone familiar with the rail design process other than the crane manufacturer. We may have a problem so I want some outside assessment and backup for my benefit.
Additional comments are welcome.
RE: Crane Design Information
RE: Crane Design Information
-Class of service (duty cycle)
-Wheel hardness - (big part of wheel/rail design)
-Crane speed
-Crane span to wheelbase ratio
-Tapered or flat treads (flat being common these days - but this maybe proving to be a bad idea)
-Indoor or outdoor service
-Thermal expansion of crane girder vs runway system
-Tight Wheel/rail float Demands Properly aligned rails - and make sure the same tool and people measure the crane's span and rail span.
All those thoughts aside -
I confirm that 60# asce has a 2-3/8" head, ignore the 1-1/4" contact area - thats getting too scientific,
That leaves 5/8" float - this seems a bit tight to me
under general circumstances.
We too have had some problems in the past which evolved into very very detailed evaluation of the cranes and runways. There are a large number of variables all of which can easily lead you to different conclusions.
RE: Crane Design Information