The enterprise illegally contracts the steel structure roof project of the accident building roof to individuals without steel structure design and construction qualification, and organizes the construction without passing the review of the construction drawings.
Some of its defects may cause accidents.
10 persons responsible for the accident were arrested and investigated for criminal responsibility! ∨ then, what are the engineering accidents prone to steel structure? Steel structure is a new type of structural system with various advantages.
Every time this disaster happens, Xiaobian’s heart will become extremely heavy.
Jinhua Municipal People’s Government: on November 23, 2021, a major steel structure collapse accident occurred at the construction site of “hubinli” project in Jinhua development zone.
It is understood that the office of Zhejiang work safety committee has asked Jinhua City to immediately organize an investigation, quickly identify the causes, study and put forward handling opinions in strict accordance with the requirements of accident investigation regulations.
② The connection strength does not meet the requirements.
collapsed during the installation of steel structure, resulting in 4 deaths and 4 injuries, and a direct economic loss of 9.86 million yuan.
Before the accident is closed, the accident investigation report (not finalized) shall be submitted to the Provincial Safety Commission Office for review and approval, and your city shall be responsible for approving and closing the case and publishing it to the public; After the case is closed, the implementation of the accident investigation report and accident handling decision shall be reported to the provincial safety committee office for filing in time.
It can be divided into two categories: loss of global stability and loss of local stability.
NOCITCE changed the push rule because of WeChat official account.
The Provincial Construction Commission Office is requested to strengthen business guidance and urge Jinhua City to seriously carry out accident investigation, cause analysis and other related work.
With the continuous development of steel structure, many other structural systems are being replaced, and the steel structure in China is also booming.
It is a community commercial complex integrating shopping, dining, entertainment, accommodation and neighborhood supporting projects.
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As of 8:00 on the 25th, 6 people were killed and 6 injured.
Steel structure accidents can be roughly divided into: steel structure bearing capacity and stiffness failure; Instability of steel structure; Steel structure fatigue; Brittle fracture of steel structure and corrosion of steel structure.
It should be noted that the calculated length of the two main axes of the section may be different, and the difference between the actual bearing surface at both ends of the member and the calculated bearing surface.
On January 4, 2021, he was suspected of the crime of major liability accident and was taken criminal coercive measures by the public security organ according to law.
It was windy and rainy that night.
But the steel structure also has its shortcomings.
After the accident, the leading comrades of the provincial Party committee and the provincial government attached great importance to it and made important instructions successively.
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The main parameter affecting it is slenderness ratio（ λ= L / R), where l is the calculated length of the member and R is the radius of gyration of the member section.
Contact person and Tel.: Zhou Chengcheng, 0571-87055020.
01 steel structure bearing capacity and stiffness failure 1.
The instability of steel structure mainly occurs in axial compression, compression bending and bending members.
Your city shall, in accordance with the provisions of Zhejiang Province on the reporting, investigation and handling of production safety accidents and other relevant provisions, immediately organize and carry out accident investigation, quickly find out the cause of the accident, study and put forward handling opinions in strict accordance with the requirements of the provisions on accident investigation.
The main reasons are: ① the strength index of steel is unqualified.
In the stability analysis of members, various initial defects have a significant impact on their ultimate bearing capacity..
As of 8:00 on the 25th, 6 people were killed and 6 injured.
Office of Zhejiang Work Safety Commission According to the official WeChat official account of Jinhua economic and Technological Development Zone in November 25, 2021, “lakeside” is located in the lake and seawall area of Jinhua economic development zone.
//Wechat public account setting prompt/// The official account is official.
Steel structure bearing capacity failure refers to the damage caused by exceeding the strength of structural members or connecting materials under normal use.
2.
The planned land is 42 mu, with a total construction area of about 100 thousand square meters.
③ Changes in service loads and conditions.
The main reasons affecting the overall stability of structural members are as follows: ① the overall stability of members does not meet the requirements.
Your city should deeply draw lessons from the accident, draw inferences from one instance, and pay close attention to the rectification of potential problems.
It is not only beneficial to resist horizontal load and vibration, but also directly affects the normal use of the structure (for example, when the overall stiffness of industrial plant is insufficient, vibration and shaking will occur during the operation of crane).
After research, the provincial safety committee office decided to supervise the investigation and handling of the major accident.
② Insufficient structural support system.
The following small series will introduce you to the engineering accidents prone to steel structures.
The wind load and ponding load induced the instability and failure of the main and secondary beams of the steel structure roof, and finally caused the collapse of the steel structure roof.
Everyone is responsible for safe production! This is a sentence that we engineers should keep in mind all the time.
02 steel structure instability 1.
② The components have various initial defects.
Both kinds of instability will affect the normal use of structural members, and may also cause other forms of damage.
The strength of welded connection depends on the strength of welding materials matched with the base metal, welding process, weld quality and defects and their inspection control, and the influence of welding on the strength of heat affected zone of base metal; The influencing factors of bolt connection strength are: the quality and heat treatment effect of bolt and its accessories (high-strength bolt), the control of bolt connection construction technology, especially the prestress control and friction surface treatment of high-strength bolt, the weakening and stress concentration of connected member section caused by bolt hole, etc.
There are two important strength indexes in qualified steel structure design: yield strength FY; In addition, when structural members bear large shear or torque, the shear strength FV of steel is also an important index.
Among them, Wei mouyou, the legal representative of the construction unit, was responsible for the accident because he dismembered the contract without approval.
Stiffness failure of steel structure refers to the plastic deformation or vibration that affects its continuous bearing or normal use.
Including overload of calculated load, additional load of other members caused by withdrawal of some members from work, accidental impact load, additional stress caused by temperature change, additional stress caused by uneven settlement of foundation, etc.
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Let’s review several similar accidents with you, hoping to have more warnings! At about 8:05 on December 30, 20, the A2 fruit workshop of the 55000 ton navel orange processing project of Anyuan Jiangxi Xiduo orange Agricultural Products Co., Ltd.
Your city should deeply draw lessons from the accident, draw inferences from one instance, and pay close attention to the rectification of potential problems.
The total investment is more than 900 million yuan.
The Zhejiang Emergency Management Office issued a notice on the inspection and supervision of the larger production safety accidents, which shows: in November 23, 2021, the Jinhua Development Zone “lakeside” A major steel structure collapse accident occurred at the construction site of the project.
The main reasons are: ① the stiffness of the structure or member does not meet the design requirements, such as the axial compression member does not meet the slenderness ratio requirements; Bending members do not meet the allowable deflection requirements; Bending members do not meet the above two requirements.
After the accident, the leading comrades of the provincial Party committee and the provincial government attached great importance to it and made important instructions successively.
and is planned to be ready for trial operation in August 2022.
At about 0:40 on May 20, 19, a steel structure roof collapse accident occurred in Baise City, Guangxi, killing 6 people and injuring 87 people.
Support system is an important part to ensure the overall and local stiffness of the structure.
The project is constructed by Jinkai Industrial Development Group Co., Ltd.
