290HC Mast Section Common problems of tower crane equipment in use, which are fatal?
1. What will happen to the enterprise if there is a problem with this equipment?
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The tower crane ear plate explosion will cause serious consequences to the enterprise and bring unnecessary economic losses to the enterprise. On the one hand, it will make the construction site under construction must be shut down for repair, resulting in the failure of the enterprise to complete the project on time, causing huge economic losses to the project. On the other hand, if there is a problem with the tower crane, it will cause casualties of the workers under construction on the site, In addition to a certain amount of compensation, enterprises should also face the adverse impact of reputation.
2. Why does such a problem occur under normal use?
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There are many reasons for this. Most of these problems are due to the non-compliance of welding technology and materials with the standards. There may also be operational problems, such as the overweight and improper operation of the tower crane. If the crane is too heavy, if it is not lowered gently, it will cause the tower crane to shake up and down violently and cause the ear plate of the tower crane to crack.
3. Which parts of the equipment are fatal and cannot be delivered?
(1) relevant standards cannot be strictly implemented Common problems are: luffing mechanism is not equipped with luffing trolley rope breaking and shaft breaking protection device; there is no weighing requirement in the counterweight manufacturing drawing, and the fixed position of counterweight is inconsistent with the design; electrical protection device is incomplete, many tower cranes have no alarm device, under (over) pressure protection device, fault phase protection device and zero position protection device; electrical switch model selection error and poor accuracy of moment protection device. The above problems do not meet the requirements of relevant standards.
(2) problems in management. As a result, the model of the new ex factory equipment is inconsistent with that on the certificate of conformity, and there is error in the dimension of the boom junk, etc.
(3) the operation manual is not perfect. For example, the pre tightening torque value of high-strength bolts is not provided; the lifting characteristic curve does not identify the rated lifting quality when the wire rope is doubled, resulting in the rated lifting quality when the wire rope is doubled, the diameter of the lifting wire rope is too small, the model of the wire rope is unclear, and the wire rope with point contact is selected instead of the wire rope with line contact.
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