The safety of the crane is used

Overview of a certain steel company mainspan no.2 steelmaking plant a hook bridge crane hoisting the steel slag, caused by secondary hook header to vice hook to hang spreader collision girder falling, applied on the surface of the hit to death a line homework personnel. At the scene of the accident to a steel mill mainspan, engaged in hoist gantry crane transportation operations lifting equipment is a hook double beam crane, crane rated lifting weight G = 30/10 t S = 19.5 m, span, lifting height H = 16 m, lifting speed.vn = 7.5 n/min, the crane cart running speed vitamin k = 87.6 m/min, the car speed vitamin k = 42.4 m/min, crane work volume for the A5. Accident process for a crane driver at the end of a set of the lifting process, vice hook back, move the hook to assignments, a vice steel crane in the ascent of the at the same time, moved the main hook of crane load, and all the attention focused on the main hook run down, and did not pay attention to pair of hook lifting operation, the secondary hook collision with girder summit, vice hook hook line's fall from 16 m altitude and hit the ground line personnel b, caused b serious accident died on the spot.