What’re the advantages of pre-stressing force method of gantry crane?
Pre-stressing force method of gantry crane is an effective method to correct main girder down-warp
Advantages:
1. Accurate and stable up-warp value after main girder correction, and it can be adjusted anytime in accordance with different purpose;
2. Simple correction technology, short period, low cost
Disadvantages:
1. It is just suitable to correct box main girder down-warp of bridge (gantry) crane, not suitable for main girder horizontal bend, local deformation, set-back correction for gantry crane cantilever
2. External appearance is not beautiful after correction
Pre-stressing force method is most appropriate to be used in below conditions:
1. Cranes that have been used many years
2. Main girder stiffness is not enough
3. Bad bearing capacity
4. Crane works with full load for a long term
5. Bad working environment
