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Gymnasium and dormitory project '12 * 29' raft foundation reinforcement system collapsed serious production safety accident investigation report. After the accident investigation team concluded that the accident was a major production safety accidents. Failure to require stacking materials, etc. at 8:20 on December 29, 2014 Xu, the Beijing Haidian District High School attached to Tsinghua University gymnasium and dormitory construction site, workers in the pit steel banding process, the raft foundation reinforcement system has undergone collapsed, killing 10 people were killed and four wounded. After the accident, the municipal government set up a '12 * 29' major production safety accident investigation team to carry out a comprehensive investigation and handling of the accident. Safety Committee of the State Council, the Central Commission for Discipline Inspection Supervision, the Supreme People's Procuratorate, the Ministry of Housing and Urban-Rural Development of the investigations carried out in handling the accident supervise the handling. Yesterday, the results of the investigation of this accident, 'baked.' Investigation team to identify, not in accordance with program requirements piled materials, production and placement horse stool, stool and reinforced horse does not form a complete structural system, resulting in the collapse of the foundation slab of reinforced overall, is the direct cause of the accident. The survey said, in violation of the construction of 'reinforced construction program,' the provisions of Article 7.7, the whole bundle of reinforced material directly stacked on top of reinforced web construction site stockpile too much, and locally too concentrated, resulting in instability stud horse stool, produced a large horizontal displacement, thereby causing the studs, welding broken down, resulting in the foundation slab of reinforced overall collapse. Haidian Construction Committee providing false materials, on-site production of horse stool used for bar diameter from 'reinforced construction plan' to reduce the required 32mm to 25mm or 28mm; live horse stool arranged spaced 0.9m ~ 2.1m, and 'reinforced construction plan' requirements 1m seriously inconsistent and uneven arrangement, the average spacing is too large; stud horse stool, lower welding less full. Between horse and horse stool stool without effective support, the horse stool with the base plate, the lower reinforcing mesh structure is not formed a complete system, anti-sway poor, can not bear too much of the load stacker. In addition, construction site management deficiencies, the record is not a long-term project manager post, a full-time security staff understaffed, chaotic management, project management is not in place is an indirect cause of the accident. The survey said, the labor sub-units