Analysis of tower crane accidents

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With the continuous deepening of China’s reform and opening up and the continuous development of the national economy, the domestic construction industry is in full swing. Tower cranes have been used more and more in construction sites and have produced good economic and social benefits. However, due to the continuous renewal of the engineering structure and the ever-increasing building height, tower cranes have been used more and more widely in urban and rural areas. Due to their great harm and inefficiency, tower cranes have gradually become a social focus in the construction safety production process.

December 24, 2015, Qingdao Guoxin Stadium is located in the Laoshan District of auxiliary training project site crane collapse accident occurred, a crane collapsed at work. One of the tower cranes completely fell down, and the other tower crane was half-inclined in the air. The accident caused three deaths and six injuries.

May 31, 2016, in the Golden Dongyang South Zhenmou industrial area of a construction site occurred were working crane collapse accident. The collapsed tower crane has a height of about 20 meters , and it has been broken by a barrage. The tower crane main frame and the bracket are stacked together. After full rescue, the crane operators who were crushed under the tower crane were rescued, but they had no vital signs. When the tower crane collapsed, another construction worker who was moving the bricks on the construction site was found to have been injured and his head was injured.

The frequent occurrence of tower crane tilt accidents sounded the alarm on top of our construction workers. The tower crane is a full-scale tower crane and belongs to a large-scale machinery and equipment. Because of its heavy lifting equipment, large working radius and high working height, its own working characteristics will cause major safety accidents in the event of an accident. In the daily construction and production process, we must strictly monitor the tower cranes from the entry registration record registration, the installation process, the use of the process of daily operations and regular maintenance process.

Tower cranes are not high-precision mechanical equipment and the causes of accidents are easily analyzed. There are three reasons for this: one is the installation and disassembly of the tower crane, the second is the use of the problem, and the third is the quality of the tower crane itself. The general causes of tower crane accident analysis are as follows:

First, tower crane manufacturers do not strictly control the production of tower cranes, technical design defects, product quality, but off, leading to accidents.

2. When the tower crane enters the construction site, the service life is too long, the entrance inspection report is not timely or is false, and it is not used by the competent authority for registration and filing for private use.

III. During the construction of the tower crane foundation, the bearing capacity of the foundation, concrete strength, rebar tying, and embedded parts cannot meet the requirements of the relevant national technical standards and standards. It is easy to form a top-heavy state, causing the tower to tilt and tilt the tower crane.

4. The hidden dangers in the installation, lifting, and attachment of tower cranes are common causes of accidents. In the process of dismantlement, there are no targeted programs, technical disclosures and corresponding organizational structures, blind operations, lack of mutual cooperation, violation of safety procedures, illegal command, and brutal construction. In the tower crane, unqualified safety hazards such as welds, structural parts, embedded parts, bolts, etc. cannot be discovered and rectified in a timely manner, which may lead to accidents during the process of dismantling and lifting.

5. The failure of the tower crane's limit has not been discovered and rectified in time, which is also the cause of multiple tower crane accidents.

6. There are multiple tower cranes on the construction site, and no anti-collision scheme and limit have been compiled. The adjacent tower cranes have overlapped operating radiuses, causing collisions and accidents.

Seventh, the tower crane driver without a license, illegal operations, coupled with lax supervision of the project department, but also easily lead to accidents.

In view of the above causes of the accident, as the construction unit, we should respond positively to the seven major requirements of the Ministry of Construction on the use of tower cranes, increase the intensity of project inspections, strictly control the tower to hang in, require construction units to purchase and use a production license and factory The tower cranes of certificates of conformity shall do a good job in site detection, and shall prepare special construction plans and emergency plans to ensure that tower crane operators, including tower crane drivers, signal workers, and secret cable workers, shall carry out their safety inspections to ensure the implementation of the tertiary education. The use of the process on time maintenance, the security risks found to supervise the rectification in place.

The occurrence of tower crane accidents will cause great personal and economic harm to the victims and their families. The social impact is huge. As a construction unit, they should take corresponding responsibility, seize the source, strictly control the process, and not relax at the end. Avoid accidents caused by tower cranes during the production process, ensure that safety is first , prevention is the main principle, and comprehensive management is the principle. Participate in creating a harmonious society.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.

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