The structure system of the canopy is seriously unreasonable.
(2) as the industry management department of industrial enterprises, the economic and Information Technology Department of Emeishan City did not perform the duties of supervision and inspection of work safety in place, and the implementation of the work of “cracking down on non violations and dealing with violations” in work safety was not effective.
Due to the thin wall thickness of chord raw materials, the on-site butt welding of chord will cause a certain degree of damage to the base metal, so as to further reduce the design strength value of the members, When the steel column collapsed and pulled the truss down, it broke from the parts with weak welding and serious corrosion in the middle.
It is also an indirect cause of the accident.
The bearing capacity and stability of the structure are seriously insufficient.
Due to the unreasonable structure system of the canopy and unscientific construction process and construction organization, the steel columns were eccentrically compressed, The truss structure was unstable, there was no effective connection under the steel column, and the embedded reinforcement was sheared and brittle, resulting in overturning and local collapse, causing 7 operators who did not take any safety protection measures to fall from a height of about 13 meters, resulting in casualties.
3.
The on-site management personnel command in violation of regulations, and the construction operators have weak safety awareness, and do not wear safety helmets and safety belts.
(1) In the absence of construction drawings and construction schemes, risk-taking construction is blindly organized, there are serious loopholes in safety technical measures and major defects in the project.
3.
According to the field inspection, the unstable collapsed steel column foundation is connected with the reinforcement by spot welding, and the weld length and thickness do not meet the specification requirements; The connection welds of truss members in the collapse area are not full and cannot be effectively connected.
Ma mingling (legal person of Wuling door and window business department of Wutongqiao): the main person in charge of the construction unit of the accident canopy failed to comply with the safety production law The safety production management responsibilities specified in Article 18 fail to guarantee the safety production management on the construction site, resulting in serious loopholes in safety technical measures and major defects in the construction scheme.
It violates the provisions of articles 4 and 5 of the safety production law and the regulations on the administration of safety production of construction projects Article 20 and 21: unqualified contractors who blindly organize unqualified labor personnel to construct the canopy construction project in the absence of design and construction scheme and safety production conditions, resulting in an accident, resulting in the serious consequences of 5 deaths and 2 injuries, are mainly responsible for the occurrence of the accident.
The local government and industry management departments do not have strong awareness of the red line of safety production, do not pay enough attention to safety production, and the local supervision responsibility is not implemented in place.
There is no reliable measure to connect the upper end of the steel column with the roof truss, resulting in the geometric variable system composed of the steel column and the roof truss, and the collapse canopy itself cannot form a stable structural system.
2.
The construction unit of the accident canopy (Fuling door and window business department, Wutongqiao District, Leshan City): the main indirect cause of the accident is that it is unqualified to contract the canopy construction project, poor safety production management and blind organization of risky construction.
（1） After investigation, the direct cause of the accident is that the construction unit organized labor personnel to work above the canopy truss with basically completed main body and concentrated stacking of color steel tiles (paving color steel tiles and purlin welding).
The owner of the accident canopy (Emeishan Yonghui industry and Trade Co., Ltd.): fails to fulfill the main responsibility of safety production, and fails to supervise and manage the safety production of the construction unit.
（2） Indirect cause of the accident 1.
III.
In violation of the requirements on the design strength and stability of steel structures in sections 7.1 and 7.2 of the steel structure design standard, about 90 color steel tiles (3 of 30 stacked) are stacked on the collapsed truss, There are about 30 transparent glass fiber tiles, weighing more than 6000 kg.
Members are connected by welding, and the welding process is rough.
According to the accident scene investigation, the specific causes of the accident are analyzed as follows: 1.
2、 The cause and nature of the accident were identified according to the principle of “four no let go” in the investigation and handling of production safety accidents.
(5) “three violations” The phenomenon is serious.
It is an important indirect cause of the accident.
The structural system does not have any inter column support and roof horizontal support; There is no reliable connection measure at the lower end of the steel column (the steel plate under the column is anchored into the foundation with four round steels with a diameter of 10mm, which is invalid anchorage and should be connected with anchor bolts).
The project leader has no basic knowledge of the building structure system.
(3) the nature of the accident was investigated and determined as “8.12” in Ledu Town, Emeishan City The canopy collapse accident is a major production safety responsibility accident.
The identification and handling suggestions of accident responsibility are proposed to “8.12” in Ledu Town, Emeishan City in accordance with the regulations of the Communist Party of China on disciplinary measures, the production safety law of the people’s Republic of China, the regulations on the reporting, investigation and handling of production safety accidents, the regulations on the administration of production safety of construction projects and other relevant provisions The units and personnel responsible for the large accident of canopy collapse shall be handled as follows: (I) personnel recommended to be transferred to the judicial organ for treatment (3 persons) 1.
By observing the connecting welds of the upper chord, web member and lower chord in the collapsed truss on site, the members at the welding position are seriously rusted, and some chord members have been rusted through.
1、 Accident process: it is understood that at about 15:40 on August 12, 2018, a responsible company in Emeishan City, Sichuan Province, during the construction of canopy, there was a major production safety accident in which seven construction workers fell due to local collapse, one died on the spot and six were injured, of which four seriously injured died due to ineffective rescue.
It is suggested that the judicial organ should be held responsible for the suspected offender Those who commit crimes shall be investigated for criminal responsibility according to law..
(1) Failure to improve and implement the safety production responsibility system and safety production rules and regulations.
After modeling, analysis and checking calculation with the steel structure design software 3D3S, the strength checking calculation result of the truss member exceeds the specification limit by 14.21 times, and the stability checking calculation exceeds the Euler critical stress.
(4) there is no safety technical disclosure and the construction quality is poor.
(2) The safety production responsibility system is not improved and implemented, there are no safety production rules and regulations and operating procedures, no full-time safety officer is arranged for on-site supervision, no safety inspection records, hidden danger investigation is not in place, and there are no safety warning signs and signs on the site.
(3) the housing and Construction Department of Emeishan City did not effectively supervise the construction safety of projects under construction.
Recently, Sichuan emergency management department issued an investigation report on the large production safety accident caused by the “8.12” canopy collapse in Ledu Town, Emeishan City.
(3) failure to entrust the project to construction units (individuals) without corresponding qualifications , lack of on-site supervision of the construction unit during construction.
(2) failure to go through planning and construction procedures, failure to entrust qualified units to design, and lack of formal design drawings.
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(1) Ledu town government failed to seriously perform its responsibility for the territorial management of production safety, failed to patrol the illegal buildings within its jurisdiction, failed to patrol the illegal construction of accident shelters, and failed to find out the potential safety problems in time and take effective measures to stop them; the major inspection of production safety was a mere formality, the investigation of potential safety hazards was not in place, and carried out the “fight against non-compliance” of production safety Poor work.
In order to further find out the cause and nature of the accident, the accident investigation team conducted a lot of investigation, inquiry and evidence collection, hired experts to conduct a detailed investigation of the accident scene, collected and mastered a large number of materials, and found out the cause and nature of the accident.
(3) safety production training and education are not in place, and operators are not qualified to work (without the qualification certificate for work at heights and special operation of welders, such information of 7 persons such as Zhang Defu can not be found through the national work safety qualification certificate system of the emergency management department).
2.
