Neke glavne klasifikacije portalnih dizalica

According to the door frame structure

Divided into gantry cranes and cantilever gantry cranes

portalne dizalice

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 site.

Cantilever gantry cranes

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 structure is often selected due to site constraints.

According to the main beam form

1. Single main beam

The single beam gantry crane has a simple structure, is easy to manufacture and install, and has a low mass. The main beam is mostly an off-track 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 form can be adopted.

The door legs have two forms: L-shaped and C-shaped. The L-shape is easy to manufacture and install, with good stress and low mass. However, the space for lifting goods through the outriggers is relatively small. The C-shaped feet are made inclined or curved, and the purpose is to have a larger lateral space so that the goods can pass through the feet smoothly.

2. Double main beam

The double girder gantry crane has strong carrying capacity, large span, good overall stability, and many varieties, but its quality is larger than that of a single girder gantry crane of the same lifting weight, and the cost is also higher. According to the main beam structure, it can be divided into two forms: box beam and truss. Generally, a box-shaped structure is used.