What is the gantry crane gantry?
The use of steel welded into a box structure, with high security, high stiffness and so on.
Generally used for large tonnage and oversized tonnage gantry cranes.
As the right picture MGhz1200, from the weight of 1,200 tons, the largest gantry crane for the country, the main beam using the box girder structure.
Box girders also have high cost, since the major, poor wind resistance and other shortcomings.