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Several factors causing the accident of tower crane
Add time：2017-08-18 16:29 Number of clicks：429
Due to the special structure of tower crane and its use, the safety problems of ideological factors exist in the installation and use of the natural environment, management, etc..
(1) the structure factors of tower crane
The stiffness, stability and strength of the steel structure of the tower crane directly affect the safety of the tower crane. Because the crane is subjected to frequent alternating load during the operation, it is very easy to make the steel structure friends tired to break the maple. As the tower crane truss weld cracking, fracture, deformation and bending of the parent material, the careful, stability and strength of the structure decreases, the steel structure of thin work damage, destruction of the local stability of steel structure. The accident cited friends.
(2) the electrical system, the mechanism and the element
The working mechanism of tower crane by electrical and control advantages of salary, easy control and low cost. At the same time, Nuo Festival electrical components easy to achieve standardization and generalization, dimensional luxury replacement is convenient, easy to implement various security protection. The working condition of the electrical system determines the reliability, safety and service performance of the tower crane. If there is any damage or abnormality, it may lead to accidents. If the electrical system is malfunction, it can cause the mechanism to produce shock and vibration, and cause the accident of breaking the axis and breaking the teeth. The damage or control of the clutch or brake may cause the crash of the car and the heavy weight. Electrical insulation aging or bad cupboard may lead to electric shock. The failure of various safety devices may lead to accidents such as inverted towers, folding arms, and heavy weight falling. Such as amplitude limit or travel limit failure, it may cause the car or car to flush the car to derailment accident. Overloading limiter and torque limiter fail, and may break up and reverse the tower accident.
Height limit device failure, may lead to excessive volume and a broken rope and a heavy fall accident of wire rope. Phase sequence protection, in the case of the fault phase and the broken phase, may cause the operation instruction disorder to cause the accident.
(3) human factors
In a number of tower crane accidents. Most of the accidents are caused by the user's violation or misoperation. The following two accidents also have the factors of illegal operation.
A unit is not driving without a ring. As a result, the workers on the track were injured by the extravagance. The construction company of a mechanical installation inspection team in the luxury of towercrane TQSOB, to replace the boom in pulling pin, ready to put off balance weight for pulling plate pins, the crane and lifting rope together, then lift the car boom. Open the jib pull plate pin, down the arm, because of backward balance weight generated over great torque, so that the tower crane is out of balance caused by falling along with the spire of the balance arm.
An accident of disassembly and disassembly. Because of the high weight of the metal structure of the tower body, the tower disassembly is a high altitude operation, with great danger and strong technical nature. In the accident of tower crane, the accident of disassembly and disassembly takes up quite a large proportion, and it is a relatively large accident. Some tower disassembly is not completed by professional installation team, but by non professional personnel. Because of the low quality of the installation staff, there is no ability to compile the installation plan, no plan selection and mechanical calculation ability, no scientific disassembly and assembly capacity is established, so the new problems or special problems in the operation process can not be solved. Accidents are inevitable. Some installation quality is not standard, leaving the accident hidden trouble.
Improper management. Inadequate training for staff and safety departments, lack of understanding and implementation of all rules and regulations, and inadequate on-site management are all risks for accidents. Some enterprise systems are not perfect, the staff members have no rules to follow, so they have to operate on personal experience and make mistakes easily. Some enterprises do not carry out special personal computers, and different plant models have different layout of operation handles. So the driver is likely to fail in operation. Some construction sites temporarily work for some staff members for work needs, so that commanders, drivers and sentries can hardly achieve them.
The industry is in harmony. Some non professionals or leaders are acting as operators temporarily. Mistakes and accidents are unavoidable. Some enterprises do not pay attention to maintenance management and fail to eliminate potential dangers.
Improper management. Inadequate training for staff and safety departments, lack of understanding and implementation of all rules and regulations, and inadequate on-site management are all risks for accidents. Some enterprise systems are not perfect, the staff members have no rules to follow, so they have to operate on personal experience and make mistakes easily. Some enterprises do not carry out special personal computers, and different plant models have different layout of operation handles. So the driver is likely to fail in operation. Some construction sites temporarily work for some staff members for work needs, so that commanders, drivers and sentries can hardly achieve them.
The industry is in harmony. Some non professionals or leaders are acting as operators temporarily. Mistakes and accidents are unavoidable. Some enterprises do not pay attention to maintenance management and fail to eliminate potential dangers.
(4) natural factors
The so-called natural because people fail to see that for ugly and harm of sudden neck, not the people's will, there is an irresistible disaster. Like earthquakes, floods, and typhoons, they can be connected to or indirectly caused by Guangdong Province. For example, when the tower crane is in the process of manufacturing, the residual stress inside the structure is too large, the stress concentration in the operation is under external force, the local stress of the structure increases sharply, and the component suddenly breaks, which results in accidents, which is also unforeseen for the users. And the tower cranes, which are made with ordinary steel, are working below zero 20 degrees centigrade, causing brittle fracture and causing force.
The component is broken. The power supply voltage of the power grid is too low and the system voltage drop is too large, which causes the failure of the electrical control, which causes the failure of the mechanism to get out of control.
There are other factors that may cause accidents. For example, the safety distance between tower cranes and high-voltage lines or adjacent buildings is not enough, which can lead to electric shock or collision accidents.
The base pressure of the tower crane is not enough, which can lead to the instability of the foundation and cause the accident of the tower.
The improper or unfavourable suspension of the hanger will lead to the fall of heavy objects. The safety protection measures, safety guardrail and retainer platform of tower crane and inconsistent requirements, may cause personnel falling accident. All of these factors are the causes of the accident. Only by following the operation and strengthening the maintenance of the equipment can we eliminate the hidden dangers and ensure the safety of production.
The so-called natural because people fail to see that for ugly and harm of sudden neck, not the people's will, there is an irresistible disaster. Like earthquakes, floods, and typhoons, they can be connected to or indirectly caused by Guangdong Province. For example, when the tower crane is in the process of manufacturing, the residual stress inside the structure is too large, the stress concentration in the operation is under external force, the local stress of the structure increases sharply, and the component suddenly breaks, which results in accidents, which is also unforeseen for the users. And the tower cranes, which are made with ordinary steel, are working below zero 20 degrees centigrade, causing brittle fracture and causing force.
The component is broken. The power supply voltage of the power grid is too low and the system voltage drop is too large, which causes the failure of the electrical control, which causes the failure of the mechanism to get out of control.
There are other factors that may cause accidents. For example, the safety distance between tower cranes and high-voltage lines or adjacent buildings is not enough, which can lead to electric shock or collision accidents.
The base pressure of the tower crane is not enough, which can lead to the instability of the foundation and cause the accident of the tower.
The improper or unfavourable suspension of the hanger will lead to the fall of heavy objects. The safety protection measures, safety guardrail and retainer platform of tower crane and inconsistent requirements, may cause personnel falling accident. All of these factors are the causes of the accident. Only by following the operation and strengthening the maintenance of the equipment can we eliminate the hidden dangers and ensure the safety of production.