L46A1 Mast Section Basic knowledge - what are the causes of tower crane steel structure fracture?

17-12-2019

The steel structure of tower crane is the support of the whole tower crane. Its quality directly represents the firmness of the tower crane. If the steel structure is not solid and breaks, especially in use, it will have very serious consequences. According to the characteristics of tower crane, the following reasons of steel structure fracture of tower crane are summarized in the tower crane construction machinery plant (http://www.fx68.net).


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1 overload




The data show that there are many accidents of hoisting equipment caused by overload. Sometimes it is the operator or commander who blindly overloads with luck to catch up with the speed. In order to catch up with the construction period, some construction project managers make the safety devices fail or dismantle the safety protection devices, especially the moment limiter fails, long-term overload operation results in the fatigue damage of the tower crane steel structure in advance, shortens the service life of the tower crane, and is prone to major accidents. When removing the old equipment or other obstacles and attachment devices, the tower crane does not clean all kinds of connecting parts (such as the embedded parts are not cut off, etc.), resulting in increased load after lifting and broken boom.




Sometimes, it is overloaded due to insufficient estimation of the weight of the lifting objects, and large-scale lifting of objects of unknown weight causes the lifting moment out of control, which easily leads to instability and tensile fracture of boom, boom tie rod and main chord of tower body. If an internal climbing tower crane is disassembled at a construction site in Shanghai and wqlo roof crane is used, the operation is against rules. When the tower crane is disassembled, it is overloaded blindly. The disassembled parts are not disassembled and the parts are not separated, resulting in local damage and serious deformation and cracking of the roof crane steel structure.

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2. The foundation is not solid




When the tower crane raises the rated load to the maximum extent, its tipping moment will cause the sinking of the unstable foundation and the impact load, resulting in the overall tipping or folding of the arm. For example, for a newly installed tower crane in a construction site in Wujiang, since the foundation selected by the construction company is on the fill of river and creek, no reinforcement treatment is carried out under the foundation of the tower crane, and the foundation of the tower crane is not made according to the requirements in the specification, and the foundation of the tower crane is not up to the ground endurance, resulting in the overall tipping of the tower crane and the foundation after installation.




3 fatigue




The fatigue failure of steel structure of tower crane is complex and bears unstable alternating stress. With the increase of working times, the fatigue strength decreases gradually. Illegal operation, cable-stayed and inclined lifting of heavy objects, causes fatigue damage of tower crane steel structure, especially large-scale cable-stayed and inclined lifting of heavy objects. In addition to bearing the lifting moment, the boom is also subject to a horizontal transverse moment. The superposition of these two moments may lead to instability and bending of boom chord, serious fatigue damage, and lateral bending of boom.

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