Gantry crane design to determine

Crane for material lifting, transportation, handling and installation of machinery and equipment and other operations.  gantry crane  is a machine along the track direction, winches lateral movement along the main beam, for the lifting movement of the lifting hook lifting devices. It features: light weight, lifting weight, installation and removal and transportation is very convenient. Universal gantry crane design has the following options:
    1, the curved beam webs webs single girder  bridge crane  curved structure, which is determined by a longitudinal girders and beams composed of two lateral side, the main beams of thin-walled curved plate structure, that is, from the center of the beam swing around the bend line single web and the upper and lower plate composed, instead of the traditional forms of box girder.
    2, box double box beam structure with a two double beam structure box girder beams and two transverse end, a dual beam bridge, in the general run on  bridge gantry crane  trolley, lifting and horizontal moving objects can be .
    3, common gantry crane gantry cranes General girder structure using a U-shaped channel steel rolling, and then with a box beam welding solid web girder is rolled into a U-shaped steel plate, and then welding into the box shaped beams.
       Gantry crane design according to the general conditions given task parameters, considering rationality, economy and reliability of such design principles, the above decision after comparing several options in this design uses a single beam structure.