Notice for Selecting Gantry Crane Used in Precast Yard

 
Gantry crane for lifting girder in precast yard is widely used for highway and high speed railway for bridge construction site. Before provided quotation, customers must provide below necessary information about the needed gantry crane as following: 
 
1.Lifting Capacity
2.Span 
3.Lifting Height
 
After that, our engineers will design the drawings of gantry crane in demand according to the above figure. Then drawings will be transferred to fabricating department to produce. After the acceptance of quality department, the gantry crane will be transported to the construction site for assembly. Soon afterwards, the gantry crane must obtain the certificate before its daily bridge construction work.
 
How to choose the most suitable gantry crane?  Not only it depends on precast girder, but also it decides by the surrounding of the precast yard. Below is the explain about lifting capacity, span and lifting height and other technical parameters of gantry crane:
 
1. Lifting Capacity:
 
In order to keep safety, rated lifting capacity of gantry crane must be more than weight of precast girder. For example, we suggest 90t precast girder adopts a set of gantry crane with 120t capacity, or two sets of gantry cranes with 60t capacity. In general, we advice to adopt two sets of gantry cranes to finish the lifting.
 
2. Span:
 
The designed span must be large than the length of precast yard. 
 
3. Lifting Height:
 
It will be decided according to stacking method of the precast girders.
 
4. Electric Hoist:
 
Gantry crane for lifting girder is always used in precast yard, there is always equipped with a set of electric hoist under main girder of the gantry crane for lifting and transport. In general, lifting capacity of the electric hoist is under 30t.
 
5. Operation Methods:
 
There are three operation methods for ZZHZ gantry crane, which includes driver’s operation, ground control, and remote control. Customers can also combine the above control methods according to their requirements.
 
6. Power Supply:
 
Cable drum or trolley conductor. In general, precast yard in always in the open air, therefore it is suggested to choose cable drum for the gantry crane used for precast yard. Trolley conductor is selected for gantry crane in workshop or factory.