Each application of Crane rail clips requires selection of the proper clip spacing.
Unfortunately, there is no easy way to calculate a value. It is therefore necessary to rely on practical experience. Closely spaced clips result in a design with a high safety factor. However, a competitive solution is to use the widest clip spacing that is consistent with safety. This note gives recommended spacing.
The crane rail clip needs to be selected to be able to carry horizontal wheel loads, ensuring it fits the structure supporting the rail. Calculations show that when a wheel is on a pair of clips and a design horizontal load is applied, the pair of clips will not experience significant horizontal loads on either side. It can also be demonstrated that for crane rails, there is no consistent carrying capacity between vertical wheel loads and horizontal bending characteristics. For example, Rodange MRS65B from Chinese steel manufacturer Kingrail Parts and German DIN 536 A100 rails have top flange widths of 102 and 100 mm respectively. So they have basically the same wheel load capacity. However, the transverse rail bending moments are 986 and 1436 units, respectively. A100 is 40% stiffer than A100 MRS65B. For this reason, only bend horizontally.
Experience has shown that crane rail clamps with a spacing of about 600 mm work well. The problem is often encountered when the spacing exceeds say 1 meter. Some difference in spacing is a reasonable practical duty. Therefore, the following clip spacing is recommended:
1. Normal application - clamp spacing 600 to 650 mm
2. Heavy duty applications and applications with guide rollers - clamp spacing 500 mm. (Note that guide rollers typically apply a horizontal load some distance from the vertical load; therefore vertical wheel loads cannot anchor the rail against horizontal forces.)
3. Light duty application - clip spacing 800 mm
Lateral load capacity of Crane rail clip
Other considerations may require further consideration. E.g:
1. For high-bay warehouse cranes, the clip spacing should be the crane's full-scale wheelbase. This prevents the tall crane structure from swaying during long stroke movements.
2. For concrete mounted rails, it may be necessary to select a spacing consistent with the rail spacing. Steel cage. It is then theoretically possible to plan drill holes to miss the rebar.