Once the overhead crane girder camber is deformed, the repairing is required unless you have adequate budget, you can replace the old piece of lifting equipment with a set of new overhead crane. There are two ways to restore the deformed crane girder, the traditional Flame Correction Method and Prestress Correction Method.
Flame Correction Method
The principle of flame correction method is to heat the three sides of the girder and cool it down to reform the girder camber. It is difficult to control the heating temperature and time, thus, it is also very difficult to guarantee the reformation of the girder camber.
Prestress Correction Method
Prestress correction method is to install two prestressed tensioners on the both sides of the flange-slabs of the overhead crane girder and use the tensioners to produce tensioning forces evenly and simultaneously to restore the crane girder camber. The advantages of this approach are:
The repairing crane girder needs no dissembling, remaining in place and taking no space.
The repairing takes short time, around 2-3 days in general.
It can restore the camber of the overhead crane girder but also can increase the strength and stiffness of girder and improve the bearing capacity.
Low repair costs
When overhead crane camber deformation happened, professional crane restoration engineer is needed and advices, technique support and services from the overhead crane manufacturer are important. Free consultation are provided from Dongqi Crane whenever needed.
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