Divided into gantry crane and cantilever gantry crane
1. Full gantry crane: The main beam has no overhang, and the trolley runs within the main span.
2. Semi-gantry crane: The outrigger has a height difference, which can be determined according to the civil construction requirements of the place of use.
1. Double-cantilever gantry crane: the most common structural method, the force of the structure and the effective use of the area of the site are reasonable.
2. Single cantilever gantry crane: This structure is often selected due to the constraints of the site.
The single main beam gantry crane has a simple structure, is easy to manufacture and install, and has a low mass. The main beam is mostly a box-shaped frame structure. Compared with the double girder gantry crane, the overall rigidity is weaker. Therefore, when the lifting weight Q≤50t and the span S≤35m, this method can be selected. There are two ways of single main beam gantry crane door legs: L type and C type. The L-shape is easy to manufacture and install, with good stress and low mass. However, the space where the lifting goods pass through the legs is relatively small. The C-shaped feet are made inclined or zigzag shape, the purpose is to have a larger horizontal space, so that the goods can pass through the feet smoothly.
The double girder gantry crane has strong load-bearing capacity, large span, good overall stability, and various types, but its own quality and the single girder gantry crane with the same lifting weight are larger and the cost is higher. According to the different main beam structure, it can be divided into box beam and truss. Nowadays, box-shaped structures are generally used.
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