The design of beam and plate precast field portal jib crane

Combined with the project general situation,it introduces the whole setting of portal jib crane,represents the construction process and methods of using portal jib crane batch by batch,consolidation large-tonnage steel box girder,steel girder spanning by using drag put up girder,so to increase the construction progress and construction quality.

Unitip the rof surport bracket and the crane truss for demotishop cotumn in the light-steel workforms with protal frames the method of that desigh and calculation were intrduced in this paper.

According to the contrast of the three schemes, such as crane truss, welding I-shaped crane girder and welding box-section crane girder, the design scheme of box-section crane girder is adopted by con sidering with the economy and the safety.