The design drawings were approved and signed and sealed.
(8) Chen xx, the technical director of Hupanli Project, was detained criminally on November 24, 2021 and arrested according to law on December 8 on suspicion of a major accident.
As there is no coordination between the architectural design of Heyi Company and the structural design of Jiuque Studio, the load of the structural method in the architectural design and construction drawing is not taken into account in the steel structure construction drawing design.
Recently, the website of Jinhua Emergency Management Bureau of Zhejiang Province released the Investigation Report on the “11 · 23” Major Collapse Accident of the Lakeside Project in Jinhua Economic and Technological Development Zone.
In the architectural construction drawing design, the construction of the banquet hall roof is in the order of 50mm thick C20 fine aggregate concrete rigid protective layer, non-woven fabric isolation layer, 3mm thick waterproof coiled material, 1.5mm thick waterproof coating, 20mm thick cement mortar leveling layer, 120mm thick rock wool board insulation layer, galvanized steel wire mesh, 1.2mm thick steel floor.
It is suggested that the personnel who have been investigated for criminal responsibility and taken criminal coercive measures by the judicial organ 1.
3.
Project design and drawing review of steel roof and operator distribution diagram In August 2020, Wang Baojun subcontracted the design task of Lakeside Project to Heyi Company, which led by Jiang Chuanmin.
Zhongheng Group Design Institute did not find any inconsistency between the design of the steel structure roof of the banquet hall and the practice of the building structure during the review process.
The planned pouring thickness was 50 mm.
At about 13:20 on November 23, 2021, the steel structure roof of the banquet hall of the Lakeside Project, a project under construction in Jinhua Economic and Technological Development Zone, collapsed during the concrete pouring and tamping of the rigid protective layer, resulting in 6 deaths, 6 injuries and a direct economic loss of 10.9755 million yuan.
The accident investigation team determined that the “11.23” collapse accident of Hubinli Project in Jinhua Economic and Technological Development Zone was a major production safety responsibility accident caused by a major error in the design of roof steel structure and failure to construct in accordance with the design drawings reviewed by the construction drawings.
(2) Qian xx, the chief engineer of Jinkai Industrial Group, was held in criminal detention on November 24, 2021, and was released on bail on December 8 for being suspected of a major accident.
Zhu Xiaobao, the actual director of Jiuque Studio, submitted the construction drawings of the main structure discipline of the project to Zhang Wei for design, and Zhang Wei submitted the construction drawings of the banquet hall steel structure roof discipline to Chen Binghong for design.
The direct cause of the accident is that there is a major error in the design of the roof steel structure, the calculated load value of the structural design is inconsistent with the building structure practice, the steel beam is designed as bent frame, and the overall calculation and analysis is not conducted with the concrete structure; The construction was not carried out according to the design drawings reviewed in the construction drawings, and the 20mm thick cement mortar leveling layer in the steel structure roof structure was changed to 50mm thick fine aggregate concrete, and the fine aggregate concrete was poured too thick, further increasing the roof load.
In the process of drawing design, the construction drawing of the steel structure of the banquet hall roof is designed to calculate the load according to the color steel tile, sandalwood strip and steel beam structure of the roof, and the value of the dead load is 0.3kN/m2.
(3) Shao xx, a project manager assigned by Jinkai Industry Group to Hupanli, was criminally detained on November 24, 2021, and was released on bail on December 8 for suspected of major accident.
At about 13:00, there were 13 people on the working face, including 10 masons working in the mud work team who poured and tamped concrete between the ⑩ – ｜ axes, 1 worker who prepared the finishing machine on the roof of the ⑩ – ｜ axis, the pump worker Wang Jun of the concrete company remotely operated the concrete pump pipe blanking at the ⑩ axis, and the management personnel Du Wanglong was on duty at the north side of the ⑩ axis.
On August 24, Jiang Chuanmin successively sent the design drawings of various disciplines of the project to the design institute of Zhongheng Group for review.
(4) Du xx, the actual contractor of Hupanli Project, was detained criminally on November 25, 2021, and arrested according to law on December 8 for being suspected of a major accident.
(6) Song xx, the person in charge of the Hupanli project site, was detained criminally on November 24, 2021, and arrested according to law on December 8 on suspicion of a major accident.
Li Zhiyong, the head of the construction mason team of the Lakeside Project, and 11 workers, such as He Youliang, Wang Fuping, and Li Zhaoya, were engaged in the construction of the C20 fine aggregate concrete rigid protective layer for the steel structure roof of the hotel banquet hall.
(7) Fang xx, the project manager of Hupanli Project, was held in criminal detention on November 24, 2021, and was released on bail on December 8 for being suspected of a major accident.
In August 2020, Heyi Company subcontracted the design of construction drawings of the structural discipline to Jiuque Studio.
When the incident happened, Wang Jun quickly escaped to the safety zone, Du Wanglong fell onto the inner scaffold, and the other 11 workers fell from the roof to the third floor.
(5) Wang xx, the actual contractor and project leader of Hupanli Project, was detained criminally on November 24, 2021, and arrested according to law on December 8 for being suspected of a major accident.
At about 13:20, when the pouring and tamping were completed to ⑩ – ｜ axis axis, the ⑩ – ｜ axis axis steel structure roof collapsed as a whole.
After 9 o’clock on November 23, 2021, the accident occurred.
Relevant personnel of the construction unit.
The concrete was poured from the ⑩ axis to the axial direction, and the concrete was transported to the pouring position by automobile pumps.
Design and drawing review personnel..
2.
Relevant personnel of the Construction Project Department.
(1) Xu xx, the legal representative of Jinkai Industrial Group, was detained criminally on November 25, 2021 and arrested according to law on December 8 on suspicion of a major accident.
As a result of the above reasons, the high-strength bolt slip at the mid span splicing point of the steel beam and the anchor bolt shear and tension bending failure of the steel beam hinge support resulted in the collapse of the two roof steel beams of Axis 11 and 12.
