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The factors to consider when choosing a semi gantry crane also apply to a gantry crane.

1.Selection of single girder and double girder semi gantry crane
In general, the lifting capacity of a semi gantry crane is below 50t and the span is within 35m. If there are no special usage requirements, it is recommended to use a single main beam type. If the width of the door legs is required to be large, the working speed is high, or heavy or long items are frequently lifted, it is advisable to choose a double beam semi gantry crane.

2.Span and cantilever length of semi gantry crane
The span of a semi gantry crane is an important factor affecting the quality of the crane itself. In the selection process, while meeting the equipment usage conditions and complying with the span series standards, the span should be minimized as much as possible.

3.Principles for determining the wheelbase of semi gantry crane

(a) Can meet the stability requirements of the gantry along the direction of the crane track;
(b) The external dimensions of the goods should be able to smoothly pass through the leg flat steel frame;
(c) Pay attention to making the wheelbase B proportional to the span S, generally taking the wheelbase B=(1/4-1/6) S.

4.Determination of spacing dimensions for semi gantry cranes
In work, there should be a certain amount of space between the external dimensions of the semi gantry crane and the cargo and transportation vehicle channels in the yard to facilitate loading and unloading operations. When general transport vehicles are loaded and unloaded within the span, they should maintain a distance of at least 0.7m from the door legs. When the lifting device is not working, there should be a distance of at least 0.5m between it and the transport vehicle. When the goods pass through the door legs, there should be a distance of at least 0.5m.

5.Selection of electrical equipment for semi gantry cranes

It should comply with the relevant provisions of GB/T14406-1993 for general semi gantry cranes.

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