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gantry cranes main girder

the failure of gantry cranes main girder problem

Long Span Gantry Crane


(1)the main girder sinking of gantry crane, The main reason for the main girder sinking are the main girder structure stress is too large, rigidity is insufficient, the joint gap is too large; overload; use over the years;

Thermal effects or heat radiation effects; chord or belly rod deformation; storage, transportation, hoisting ways is not correct.

Mainly for the main girder subsidence maintenance methods are: the use of flame and prestressing two ways to repair; for the local reinforcement.


(2)The girder of the gantry crane is horizontally bent. The main cause of horizontal bending of the main girder are :Improper welding process; Stored and transported incorrectly. For the main girder horizontal bending to take the main method repair to the use of flame correction method and appropriate with a pull, with the top correction.

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