Crane suffered crane load work characteristics determine the randomness of its load , the load in different states have a basic load , three additional loads and special loads .
a) Basic load
The basic load is always acting on the structure and regular load . It includes crane metal structure, organization , power and electrical equipment , such as quality of gravity and the weight of the load lifting crane lifting load capacity quality . Lifting quality including allowing maximum lifting objects , devices and extract suspension and other equipment along with elevating the quality , but also the impact generated when running on uneven road load and agencies Kai , horizontal load caused by braking .
b) additional load
Additional load refers to the crane under normal operating conditions, the structure suffered non-recurring effect of the load . Major role in the structure , including the maximum wind load ; hanging horizontal load items when the wind load on the structure produced ; crane skew lateral forces caused by the operation ; temperature loads , snow loads and loads of technology and so on.
c) special loads
Special crane load is the maximum load in the structure may be a non- working state , the operating state or in the occasional adverse load. The former non-operating state , such as wind load, the test load , the installation loads, seismic loads , some of the load process ; latter below the crane operation state structure by the collision load.
When using a crane before delivery must be static and dynamic tests . Static test load of 1.25 times the rated load . Dynamic test load to rated load 1.1 beta . Full test items off the ground when dropped from up or down the brake should be smooth .
Crane installation process, the metal becomes u loads suffered install load. Playing highly mobile cranes installed in the earthquake zone must consider seismic loads .
Load generated when the crane or trolley buffers and end stoppers collision , or the collision of two cranes collision load when called .