In the steel plant in the crane inspection a few questions

Lateral stiffness of the rail and the beam instability
     Steel plant bearing rail beam, the use of "I"-shaped self-contained steel surface, the rail beam itself fixed commonly used methods are as follows: the rail beam mounted on a steel column bracket on the lower edge of the beam plate with bolts and bracket connection, beam edge board through the plate and column connection. When the  hoist crane  trolley or hanging objects swing longitudinally along the main beam, its large wheels to the rail through applying a lateral variation of the beam load; time if not enough lateral stiffness of the rail beam severe vibration occurred, or is not firmly fixed bearing rail beam and instability, the safe operation of the  bridge gantry crane  will be adversely affected. For some large span the rail beam, when the crane girder span in the rail when unloaded from the car, the brake will cause a greater bearing rail beam transverse vibrations. Currently  overhead gantry crane  rail beam inspection regulations Chengdui Cheng lateral stiffness is no clear standard requirements and the corresponding test methods, making inspection judgment difficult. Recommended test can be used when no load, the amount of 1.1 times the amount of load and load up under braking the car simply to authenticate the rail beam lateral stiffness.