How to lifting the box girder of gantry crane(Part II ) ?
In order to finish the girder lifting successfully , when using the crane to lifting box girder , we must adhere to the process flow,. ZZHZ has very rich installing experience , the 
matters need attentions are following:
1. when lifting, in case of swing of steel box girder is too big, we often adopt the transverse girder by manual hoist to control them.
2. we set up the wind cable on the gantry crane’s legs to fix the cranes ‘ traverse brake.
3. when the steel box girder is lifted in the air , we should check all the slings and lifting points .
4. the cranes’ working speed we should control about 8m/min, it can’t exceed the speed limit.
5. when lifting the steel box girder, we should do some control in case of influence of swing of wind and shock.
