In the face of the construction party’s non-compliance How many units can be brave enough to say “no”? Circular of Beijing Municipal Commission of housing and urban rural development, Beijing Municipal Commission of planning, land and resources management on the investigation and handling of the quality problem of local collapse of the roof of the first floor of the underground garage project of plot A-E, Xihuang village, Shijingshan District, housing and urban construction commissions of all districts, housing and urban construction commissions of Dongcheng and Xicheng districts, and Construction Bureau of economic and Technological Development Zone, All relevant units: on the afternoon of August 19, 2017, when the construction personnel on the site of the underground garage project of plot A-E, Xihuang village, Shijingshan District, our city used a forklift to cover the soil on the basement roof, the roof on the northeast side of the basement floor collapsed locally.
The construction unit of the project is a company in Beijing (level IV of real estate development), the design unit is a company in Beijing (level a of Construction Engineering), the construction unit is a company in China (special grade of general contracting of Housing Construction Engineering), and the supervision unit is a company in Beijing (class a supervision of Housing Construction Engineering).
During garden operation, due to excessive optimization and unreasonable structure type, the structure collapses during backfill.
In this link, the construction unit has the behavior of reducing the quality standards of construction projects, which violates the provisions of paragraph 2 of Article 10 of the regulations on the quality management of construction projects that “the construction unit shall not express or imply that the design unit or construction unit violates the mandatory standards of project construction and reduces the quality of construction projects”..
Under pressure, the design institute obeys.
1.
(Android and IOS users operate the same) in 2017, a collapse accident occurred in Beijing due to the optimization of the basement.
At present, it can be confirmed that the punching bearing capacity at the slab column joints of the roof of the first underground floor does not meet the requirements of the design code, which is the direct cause of the quality problem.
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At about 3:15 p.m., the area of axis 3-8 / G-K was on the ground The roof of the next floor sinks and collapses, and the second floor underground in the same area collapses locally.
The design Institute was unwilling to change the original design, and the construction unit immediately issued a document saying: “If the drawings are not submitted on time, the comments are not replied, or the modifications are not modified or incomplete, our company reserves the right to claim against your company.
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After the collapse, the Municipal Commission of housing and urban rural development and the Municipal Commission of planning, land and resources established a joint investigation team to investigate the construction, design, construction and supervision units from the aspects of engineering design, construction quality, on-site management, market behavior and so on.
Basic information of engineering and quality problems.
The construction unit optimized the structure type of the basement from the original beam floor to the beamless floor, and the reinforcement content index was reduced from 150-175kg / m2 to 105-115kg / m2.
The investigation and treatment are reported as follows: I.
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The underground garage project of lot A-E, phase II of resettlement housing project of Xihuang village shantytown reconstruction land development project, Shijingshan District, Beijing is located in the east of Badachu Road, Shijingshan District, Beijing.
On the afternoon of August 19, 2017, two ZL50 loaders were operating on the project site, one was removing soil from the roof of A-E garage, and the other was loading the removed unqualified soil onto the transport vehicle on the north side of building 14, while pushing about 3 vehicles of qualified soil on the north side of building 14 directly to the roof of A-E garage.
Finally, the construction party is punished together with the construction, design and supervision.
（2） Indirect cause the construction unit, the design unit, the construction unit and the supervision unit all have management loopholes in varying degrees, which is the indirect cause of the quality problem.
The roof of the underground garage adopts concrete slab column shear wall structure, with a construction area of 10849.7 square meters and a design soil covering thickness of 1.80 meters, The project structure passed the acceptance on June 26, 2017.
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First, the construction unit entrusted a Beijing company to optimize the design of the independent garage according to the supervision The company’s garage optimization design opinion of “it is recommended to adopt the beamless floor system (the beam slab system originally designed by the design unit) and the quota design of the reinforcement consumption of the independent garage (reduced from 150-175kg / m2 to 105-115kg / m2)” was clearly put forward in the work contact sheet sent to the design company on June 29, 2015 “If the drawings are not submitted on time and the comments are not replied or not modified or modified incompletely, our company reserves the right to claim against your company”, and the design unit modifies the design under its pressure.
Through on-site inspection, detection and identification, investigation and evidence collection, the causes and responsibilities of the quality problem were identified, and the relevant responsible units and persons were punished and dealt with based on the investigation facts and relevant laws and regulations.
The construction unit violates the regulations to reduce the project quality standard and neglect the project management.
II Cause analysis (I) direct cause according to the appraisal conclusion in the appraisal report of the national construction engineering quality supervision and inspection center: “under the design condition, the design value of punching action effect of some slab column joints on the roof of the first floor underground is greater than the design value of punching bearing capacity at the corresponding position, which does not meet the code for design of concrete structures (gb50010-2010); under actual working conditions, the design value of punching effect of some slab column joints on the roof of the first floor underground is greater than the design value of punching bearing capacity at corresponding positions, which does not meet the code for design of concrete structures (gb50010-2010) “, the local collapse of the basement may be caused by a variety of reasons.