Bridge crane

When the load on the main girder span camber should be F = LK1000 (0.9 ~ 1.4) (wherein LK-based beam span), but the crane in use, often due to overload, thermal radiation and repair bridge gantry crane irrational factors such as main beam camber disappear. From a city crane factory to investigate the plant manufactured products tested 106 quay cranes situation, the result is the use of the arch disappeared after 1 year, 2-5 years 20% of the arch disappeared 30% to 50%. use 5-10 years more than 60% on the arch disappeared almost entirely disappeared more than 10 years, and produce under torsion, seriously affecting the safety in production. Disappearance of the main beam camber is essentially metal structure deformation. This will cause a malfunction size car run institutions, resulting in wheel overhead gantry crane size skew span error increases, which will affect the smooth operation of the trolley car safety gauge changes, the size of the car, "bite the Road" serious phenomenon. Main beam deflection will produce severe lower level next bend plate waves increases.