Lift Bridge-Girder Gantry Crane equipped with special spreader, traveling mechanism can do steering walk, mainly used for handling and transitions lifting of large bridge.
http://www.craneus.com/Bridge-Construction-Gantry-Crane/Lift_Bridge_Girder_Gantry_/Lift_Bridge_Girder_Gantry_Crane_58.html
http://chinamarket.chinesecms.com/Service/
