Single girder gantry crane reason for the existence of assembled components and solutions

    Single girder  overhead gantry crane  simple structure, easy installation, the quality of their small, mostly off-track girder box-shaped frame structure. And double-girder gantry crane compared to the overall stiffness is weaker. Therefore, when the starting weight Q ≤ 50t, span S ≤ 35m, we can use this form. Single girder  bridge gantry crane  doors legs with L-and C-type forms. L-manufacture and installation convenience, the force is good, the quality of their small, but, lifting cargo space through the legs at a relatively small number. The feet made ​​of C-inclined or curved shape, the purpose is to have large lateral space to pass the goods foot.

    I. Analysis:

     1, single girder  hoist gantry crane  assembly process is unreasonable.

     2, the assembly node size does not meet the design requirements.

    Second, the solution:

     1, component assembly to be set up assembly table, positioning welding to single girder gantry crane component leveling underside to prevent warping. The level of the pivot table should be assembled, to prevent welding in welding deformation. In particular beam segment or stairway final assembly, to adjust the positioning after welding deformation, pay attention to the node size to meet the design requirements, otherwise easily lead to component distortion.

     2, own less rigid member, stood before welding reinforcement, components should be carried out after leveling stand, or component can not be corrected after welding.

     3, component bagging, value greater than single girder gantry crane design value, easy to produce extruded surface elevation exceeded; value is less than the design value, install rear spar lower torsion.