Cranes should be able to travel along their runway rails without binding or with a minimum amount of skew. Their overall performance depends on certain factors, including the condition of the runway and its alignment. Poor rail alignment can cause a chain reaction, eventually leading to unnecessary wear and tear of wheels and rails, and structural fatigue.
Improper tracking is usually investigated by performing a traditional runway survey. This method, however, may result in days of costly downtime or yield findings that may not be clear or accurate.
So what causes a crane to travel incorrectly on the runway? Here are a few examples.
A runway that is not installed in accordance with specifications and tolerances may bring about premature wheel and rail wear, as well as other crane and component issues.
Poor runway alignment may result in crane flanging, skewing, or binding. It too can lead to excessive stress to the runway beams and extensive wheel and rail wear.
Clips, which secure and support the crane rail, prevent it from moving when the crane travels on the runway.
A crane rail pad is essential in reducing shock and vibration in a rail system. The pad laid under the rail provides load distribution over a larger surface, elimination of load concentrations and the resultant fatigue stresses, and centering of loads on the supporting element. It also absorbs uneven contact surfaces between rail and support, reduces noise and vibrations, and acts as a seal between the bottom of the rail and the top of the support.
Incorrect crane alignment can give rise to premature wheel wear, rail wear, structural component failures or drive faults.
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