Product description 300t truss type bridge girder erection equipment beam launcher crane is a professional design for u type bridge machine required for erection of city rail transit construction beam. As a kind of structure section, the u beam has good noise reduction effect, low construction height, high utilization ratio of cross section space. Because of u type beam for thin-walled opening structure, the traditional bridge rack beam cannot be applied directly. Unable to realize the traditional function of carrying beam traversing, beam body installation can only be achieved by traversing the crane. Therefore 300t truss type bridge girder erection equipment beam launcher crane, acquired vehicle girder, two cranes synchronous walking, then synchronized fall beam" of the process, simple operation, safe and stable.