Runway and Bridge Surveys
Runway misalignment due to building settlement is common to most buildings containing bridge cranes and monorails. Buildings settle naturally anyway but with the added impact loadings that cranes produce they sometimes settle more quickly. This settlement results in runway elevations and spans becoming out of tolerance.
Crane overloads can lead to permanent deflection to bridge support columns and crane runways causing them to be out of tolerance. This out of tolerance condition will tend to worsen over time if left unchecked.