When the load near the lifting point of the frame increases, causing local damage, the frame loses the overload protection and shutdown function, resulting in chain reaction, resulting in the overall fall of the frame, which is the direct cause of the accident
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There are some problems in the project, such as affiliation, illegal subcontracting and falsehood of scaffolders
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The direct cause of the accident is that the operators work on the falling frame and cross work on the landing frame in violation of regulations
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The working hours of the workers on the construction site are 12:30 in the afternoon, and the working hours of the management personnel of the project department are 13:30
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Illegal command
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During the falling process, the climbing frame collided with the floor frame at the bottom (the top of the floor frame is about 44m above the ground), resulting in partial damage to the floor frame
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On March 13, the project Department of China Construction Second Engineering Bureau planned to move the climbing frame downward according to the progress of the project
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discussed the resumption of construction of China Construction Second Engineering Bureau
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At the same time, wechat was used to forward the “supervision memorandum” on June 26, 2018, which read: “in view of the fact that the project manager of the sub contractor of the climbing frame specialty does not perform his duties, the project manager’s signature is not his own, which violates the safety management regulations of the more dangerous sub projects and sub projects, and there are potential safety hazards; the general contractor is required to strengthen the management of the professional sub contractors, and distinguish the supervision safety management responsibilities This is a reminder
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Indirect causes of the accident 1
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On the morning of March 21, Li Lin, Gong Xing, Chen Hongguang and Yao Mingming, the scaffolders of Nanjing techen, under the leadership of Liao Junhong, the team leader, continued to reduce the scaffolds
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Later, AVIC Baosheng Offshore Engineering Cable Co., Ltd
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On March 16, during the daily safety inspection, Solvay company found that the climbing frame on the northwest side of No
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Xu Wei immediately contacted Gao Dongwei, director of the equipment testing department of Yangzhou Jianning Engineering Technology Consulting Co., Ltd
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Liu Shengwei and LV Chengcheng organized the climbing frame to descend in pieces without the consent of Solvay
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did not seriously perform the unified coordination and management responsibilities, resulting in the confusion of on-site safety management; secondly, LV Chengcheng, the safety officer of the project of China Construction Second Engineering Bureau, concurrently served as the construction worker, deleted the signature column of the supervision unit in the inspection and acceptance form before climbing and descending; thirdly, ou chuanfei, the former project manager of haitechen, was absent for a long time, and Liu Shengwei, the safety officer of Nanjing techen, acted as the supervisor The actual person in charge of the site pretended to be the project manager’s signature, and the relevant parties did not take effective measures to stop it; fourth, the operation time of the safety management personnel of the project department was inconsistent with that of the labor service personnel, and the operation process was lack of effective supervision
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At 10:24, Xu Wei contacted Hu you, the production manager of China Construction Second Engineering Bureau by telephone and forwarded the “supervision notes” to Hu you via wechat
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First, Xiao Feibiao, the person in charge of the safety department of Nanjing techen, directed the construction personnel of the climbing frame to remove part of the anti falling and anti overturning device of the climbing frame through wechat, which resulted in the climbing frame losing the anti falling control; second, Yang Dong, the manager of the Engineering Department of the project Department of the second construction bureau of China, and LV Chengcheng, the safety officer, illegally directed the personnel of the climbing frame sub contractor and the labor sub contractor on the climbing frame and landing frame at the same time Third, in the case that the landing frame has not passed the acceptance, Yang Dong illegally directed the personnel of the labor sub contractor to engage in the external wall plastering operation; fourth, in the process of climbing down, Yang Dong illegally directed the personnel of the labor sub contractor to engage in the wall hole repair operation on the climbing frame
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First, Nanjing techen contracted the climbing frame project by affixing the qualification of Qianhai techen; second, Qianhai techen illegally contracted the labor work to Li Bin who did not have the qualification; third, the scaffold wage certificate held by the climbing frame operators (Li Bin, Liao Junhong, Gong Xing, etc.) was forged
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4
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On the same day, according to the inspection conclusion, LV Chengcheng submitted the “Notice of climbing frame descending operation” to Suwei company, and planned to implement the descending operation of climbing frame at 6:30 on March 14
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by telephone to inquire about the hidden dangers and precautions of climbing frame descending
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Firstly, Suwei company found that there were hidden dangers in the climbing operation, and did not take effective measures to stop it; secondly, Suwei company did not check the climbing project according to the relevant requirements of the Ministry of construction on the inspection of dangerous large projects; thirdly, Suwei company did not track and supervise the implementation in place when it knew that the project manager of the subcontractor was not on duty for a long time and the relevant personnel pretended to be the project manager’s signature
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The supervisor of Solvay did not issue the order of project suspension and other emergency measures to the construction unit after finding out
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The project supervision is not in place
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Review of the incident: at about 13:10 on March 21, 2019, the attached lifting scaffold (hereinafter referred to as climbing scaffold) at 16.5-19 floors in the northeast corner of No
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After receiving Xu Wei’s call, Hu you forwarded the “supervision notes” wechat to LV Chengcheng
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101A cross-linked vertical tower (the height of the frame is about 22.5m × the length is about 19m, and the weight is about 20 tons) fell, and the bottom of the frame is about 92m above the ground
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planned to suspend the construction contract with China Construction Second Engineering Bureau, and informed the supervision unit to suspend the supervision work
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101A cross-linked vertical tower had dropped to its position, and asked the construction unit to check and accept the climbing frame system after it had been lowered, but did not stop the descending behavior of the climbing frame
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From March 17 to 19, Liu Shengwei and LV Chengcheng successively organized relevant personnel to lower the main climbing frame on the north side of No
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At 10:12, under the arrangement of chief supervision engineer Zhang Lide, Li Shengjie, supervisor of Suwei company, reported to Xu Wei of municipal safety supervision station by wechat, saying that “the climbing frame system is being installed downward (external powder), the danger is greater than that of upward installation, and there are potential safety hazards
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3
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2
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After the accident from January 16 to March 11, 2019, due to project progress and other reasons, AVIC Baosheng Offshore Engineering Cable Co., Ltd
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On the morning of March 21, Yang Dong, manager of the Engineering Department of the project Department of China Construction Second Engineering Bureau, orally informed Li Chenjian, the construction worker of Zheshu company, to organize labor workers to plaster the external wall on the floor frame, and arrange another labor worker to repair the screw hole on the northeast corner of the climbing frame
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Project management confusion
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5
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At the time of the accident, there were five scaffolders working on the climbing frame in Nanjing techen; one employee of Zhejiang Shu company was engaged in hole mending on the climbing frame, and seven employees were engaged in external wall plastering on the landing frame (five involved)
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The inspection conclusion was qualified, Su Wei said The company did not participate in the inspection work before climbing and descending
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Recently, Yangzhou Emergency Management Bureau released the accident investigation report
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Firstly, AVIC Baosheng Offshore Engineering Cable Co., Ltd
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During the falling process, it collided with the landing scaffold at the bottom of cross-linked tower (hereinafter referred to as landing scaffold), causing 7 deaths and 4 deaths The direct economic loss caused by the accident was about 10.38 million yuan
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On March 11, Suwei company received the contact list of the restoration project and continued to implement the supervision
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China Construction Second Engineering Bureau and Solvay did not arrange personnel to inspect the construction site
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101A cross-linked tower began to descend
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On March 20, the climbing frame at the northeast corner of No
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The direct cause of the accident is that the steel wire rope is used to replace the lifting support of the climbing frame, all the anti falling devices of the climbing frame are removed artificially, and the signal wire of the synchronous control device is pulled out
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At about 13:10 p.m., the climbing frame at the northeast corner of No
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Li Chen Jian arranged Xi Deshui, sun baomu, Zhang Zhongyang, Xu Huayu, Wang Haiping, linggentang and sun Shengyue to plaster on the floor stand, and arranged song Baolin to repair screw holes on the climbing stand
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101A cross-linked tower of AVIC Baosheng offshore cable engineering project in Yangzhou Economic and Technological Development Zone fell during descending operation
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101A cross linked vertical tower
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LV Chengcheng, Liu Shengwei and other relevant personnel of the project department inspected and accepted the climbing frame before lowering operation, and filled in the inspection and acceptance form of attached lifting scaffold before lifting and lowering operation (the signature column of the supervision unit was deleted in the form)
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Ineffective implementation of regulatory responsibilities.
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The supervision memorandum has been reported to the owner, and it is hereby reported for reference.”
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