Use factors affecting the safety of Tower crane hoist


Tower hoisting is one of the most widely used and most efficient vertical lifting equipment in construction field, which has become an important factor affecting construction progress and quality.

Analyzing the characteristics of tower crane safety management and taking measures to improve the security of tower crane, the effect of receiving half the effort is doubled.
The use factors that affect the safety of the tower crane are as follows:
(1) The height of the tower lifting operation is from 20 meters to more than 400 meters. Drivers, installers and maintenance personnel all work in the air.

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With the rapid development of urban construction, the space that can be left to the construction units is already very small. In this narrow space, the operation of the tower crane inevitably exceeds the scope of the construction site, and the arm frame activity area often extends to non-construction areas.

 Installation and maintenance are more difficult than engineering machinery operating on the ground. In the event of a tower accident, not only will drivers, installation personnel and maintenance personnel be killed or injured, but the safety of buildings, equipment and personnel in the surrounding non-construction areas will be endangered, and the tower crane itself will also be damaged.

Serious tower accidents will cause a tragedy of "killing people."

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(2) For tower lifts in middle and high-rise buildings, the tower body is connected with the structure of the building by anchoring devices every 16 to 20m with a tether(attached wall frame). Some inverted tower accidents are caused by the fact that the device is not strong or the wall structure is not good enough to anchor the device.

 After the inverted tower, the tower crane and the building will be damaged.
(3) Unlike most internal combustion engineering machinery, tower cranes are powered by electricity, and some tower suspension operation areas have overhead power lines crossing.

 Therefore, hidden dangers of electric shock exist in the internal and external environments of Tower cranes. Safe use of electricity and avoidance of overhead power lines are the first step in the security management of Tower cranes.
(4) Unlike most construction machinery that can be operated by machines alone, tower lifting operations require a variety of special operators such as drivers and command personnel(signal workers) to work together.

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Their technical quality or coordination status has also become an influence on the safety of Tower lifting. factor. Some tower hanging accidents are caused by the poor technical quality or poor coordination of one or more of their operators.
(5) Of the more than 200,000 towers currently in use in China, more than 100,000 are leased. Many tower cranes are caused by the lack of security management of one or both parties.
(6) During the entire construction period, most construction machinery generally does not need to be demolished or installed to change the main structure, while tower cranes are required to perform construction during the entire construction of high-rise buildings.

In order to carry out the work of changing the structure such as loading, dismantling and repeatedly upgrading, the potential for accidents is also natural.
(7) During the construction of large buildings or buildings, or in order to shorten the duration of construction and improve the efficiency of work, construction units will have multiple towers and cranes operating in the same area at the same time.

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 Due to the small size of the construction site, there is a hidden danger that the command signal and the wireless communication Heqi will interfere with each other. If handled improperly, it will cause safety accidents. Engineering machines operating on the ground also have group operations, but the operations are not related to each other.

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(5) The government departments shall strengthen supervision over the use of towers for more than five years. In addition to requiring the owners of towers to conduct regular self-inspection, the supervisory authorities shall also conduct inspections.

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(6) The use of reliable technical means to strengthen the monitoring of Tower lifting. For example, the black box for tower lifting can be scientifically tested for illegal operation of Tower lifting, provide real and reliable data for managers to effectively manage equipment, effectively prevent and suppress accidents, and eliminate hidden dangers to safe production.

At the same time, it also provides detailed data inquiries for the quality supervision department.

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