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 the gantry crane prepares to hoisting, the worker need to check the installation of each mechanism , parts and connection, only to make sure the safety, we can do the lifting work.
2. when the slings are falling , the connection points of slings and steel box girder, we adopt steel rope flexible connection, so make the connection of lifting tools and lifting points come true is very easy.
3. when hoisting, we need to measure the stress of steel box girder is even or not , or the moment of lifting point is equal or not, if the moment is not equal , the worker should adjust the steel rope by winch, if the adjust can’t work, the worker should stop the lifting work.
4. 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.
5. we set up the wind cable on the gantry crane’s legs to fix the cranes ‘ traverse brake.
6. when the steel box girder is lifted in the air , we should check all the slings and lifting points .
7. the cranes’ working speed we should control about 8m/min, it can’t exceed the speed limit.
8. when lifting the steel box girder, we should do some control in case of influence of swing of wind and shock.