Double Overhead Gantry Crane

Gantry crane is a deformation of bridge crane, also called gantry crane. It is mainly used for loading and unloading operations of outdoor cargo yards, stockyard cargoes, and bulk cargoes. Gantry cranes have the characteristics of high site utilization, large operating range, wide adaptability, and strong versatility, and are widely used in port freight yards.

Divided into gantry cranes and cantilever gantry cranes
Gantry crane
1. Full gantry crane: the main girder has no overhang, and the trolley is carried within the main span;
2. Semi-gantry crane: The outriggers have a height difference, which can be determined according to the civil engineering requirements of the site.
Cantilever Gantry Crane
1. Double cantilever gantry crane: The most common structural form, the force of the structure and the effective use of the site area are reasonable.
2. Single cantilever gantry crane: This structural form is often selected due to site constraints.

Global Industrial Gantry Crane Details Images

1. Truss beam
The structural form welded by angle steel or I-beam has the advantages of low cost, light weight and good wind resistance. However, due to the many welding points and the defects of the truss itself, the truss beam also has the disadvantages of large deflection, low stiffness, relatively low reliability, and frequent inspection of welding points. It is suitable for sites with lower safety requirements and lower lifting capacity.
2. Box girder
The steel plate is welded into a box structure, which has the characteristics of high safety and high rigidity. It is generally used for large-tonnage and super-large-tonnage gantry cranes. As shown in the overview diagram MGhz1200, with a lifting capacity of 1,200 tons, it is the largest gantry crane in China, and the main girder adopts a box girder structure. The box girder also has the disadvantages of high cost, heavy weight, and poor wind resistance.
3. Honeycomb beam
Generally refers to "isosceles triangular honeycomb beam", the end face of the main beam is triangular, there are honeycomb holes on the oblique belly on both sides, and there are chords on the upper and lower parts. Honeycomb girder absorbs the characteristics of truss girder and box girder, and has greater rigidity, smaller deflection and higher reliability than truss girder. However, due to the welding of steel plates, the self-weight and cost are slightly higher than those of truss beams. It is suitable for sites or beam yards that are frequently used or have heavy lifting capacity. Since this beam type is a patented product, there are fewer manufacturers.

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