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Due to the supervision error of the construction party, inferior concrete was purchased, resulting in the overall low concrete strength of the project
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18 buildings in block 85 of Qingdao Guoke health technology town were destroyed and rebuilt at 6:15 am on April 14
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In December last year, it was widely spread that three residential buildings under construction in Qingdao Guoke health town would be demolished due to quality problems
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A member of the public disclosed to reporters that a building under construction in Qingdao needed to be rebuilt due to concrete problems
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According to the video, on December 6, a communication meeting was held for the owners of plot 85 of Guoke health technology town in Chengyang District of Qingdao due to the delay in delivery, with nearly 1000 owners participating in the meeting
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The reason for the delay in delivery is that the building has been exposed to plot 85, the concrete strength of three buildings does not meet the design requirements, and the three buildings will be reworked and rebuilt
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Developers called a meeting of buyers on November 29
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According to the video information provided by the owner at the communication meeting, the overall concrete strength of buildings 9, 13 and 17 in plot 85 of Qingdao Guoke health technology town is low, and the local components of other buildings do not meet the design requirements of concrete strength
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According to the previous Shandong TV Qilu channel report, the test report issued by Shandong construction quality inspection and Testing Center shows that the proportion of test batches whose estimated concrete strength of the main structure of the three reconstructed buildings reaches 85% of the design strength is 25%, 11.1% and 15% respectively, and the rest of the buildings are only 47% to 80%
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In this regard, the Beijing News invited experts to interpret that concrete is a raw material, there are quality problems, which may harm the building components
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Video screenshot at the communication meeting between Guoke project and the owner, the general contractor of construction admitted that “the procurement supervision is not in place”
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In recent years, many cases of substandard concrete quality leading to building collapse, demolition and reconstruction have been exposed..
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Take a look at the following cases of substandard concrete in residential buildings! Yiwu, Zhejiang: “Xijiang Yayuan” in December 2019, CCTV finance exposed that there were serious quality problems in the building under construction “Xijiang Yayuan” in Yiwu, Zhejiang
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This property is known as the local high-end property
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There are some problems in different floors of many houses, such as “the concrete will fall down when the beams and columns are pulled lightly”, “the ceiling, walls, balconies, bay windows and so on have different degrees of cracking”
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According to the plan, the total construction area of the project is 134574.20 square meters above ground and 111960.72 square meters underground
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Some owners said that “who dares to live in the house he bought with more than 10 million yuan?”
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It is understood that before the owners and developers jointly selected five testing units to test 40 buildings that have been capped
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However, in the test report of every household, there is the same sentence – “it does not meet the design requirements, it does not meet the use requirements”
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On December 28, the developer of the real estate responded that the company agreed to check out the owner who had quality problems and did not accept the rectification plan
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Changsha, Hunan: “problem concrete” in the second half of 2019, some property owners and media reported that the concrete of Hunan tuoyu Concrete Co., Ltd
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had quality problems
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After that, Changsha Municipal Bureau of housing and urban rural development issued a circular
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After verification, it was found that there were 59 projects using problematic concrete in the same period in the city, and a total of 3 projects had problems
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The strength of some concrete members above the 12th floor of C10 building in the third bid of Xincheng international Huadu phase 5 project did not meet the design requirements
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In October, the participating units were required to rework and reconstruct the 12th-27th floors of C10 building
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The strength of some concrete members on floors 21-25 of building 13 in lot 2 of phase 2 of land 1.1 of new Hualian dream city project does not meet the design requirements
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It is planned to officially enter the site for demolition on December 10, with a construction period of about 60 days
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The concrete compressive strength of the four roof beams in the basement of the complex building of Baowan international e-commerce logistics port project in Wangcheng district is one grade lower than the design requirements
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After the original design unit’s review, the members meet the requirements of bearing capacity and normal use
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At present, the concrete supplier Hunan tuoyu Concrete Co., Ltd
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has been completely shut down
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The public security organ of Wangcheng District of Changsha City has put the case on file for investigation and taken compulsory measures against the legal representative of the enterprise
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Bengbu, Anhui: the intensity is not up to the standard
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In November 2019, a residential building in Huaishang District, Bengbu, Anhui was reported by the local bureau of housing and urban rural development
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Because the concrete construction of the shear wall on the second floor was not carried out according to the engineering design drawings, and failed to reach the design strength level after testing, the construction party was fined more than 330000 yuan
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At the same time, the project manager of the project was fined 16588 yuan
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According to the official decision, “after testing, it only reaches C40 strength level, but does not meet the design strength level C50 requirements.”
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Jinan, Shandong Province: Lily Garden Project in December 2018, there are four high-rise residential buildings in the Lily Garden project located in Zhangqiu District, Jinan City, which have been mostly sold
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Due to the substandard concrete strength, they are being demolished by the developer
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Zhangqiu district housing and Construction Commission and construction quality supervision station of the relevant responsible person said, this is the developer took the initiative to demolish four residential buildings, “after demolition will be rebuilt.”
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According to the circular, Zhangqiu District Commission of housing and urban rural development has punished the construction unit, agent construction management unit, supervision unit, construction unit and relevant ready mixed concrete production unit and person in charge to varying degrees
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Among them, the construction unit and the person in charge of the project were criticized in the whole region; Instruct the construction unit to make a written review and publicize it in the whole district
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According to the code for acceptance of construction quality of concrete structures (GB 50204-2015), the acceptance of construction quality of concrete structure subdivisions should be qualified not only in appearance quality, but also in structural entity inspection
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The structural entity inspection is mainly carried out for the representative parts related to the safety of concrete structure, including three major contents: ① concrete strength, ② thickness of reinforcement cover, and ③ structural position and size deviation
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concrete strength inspection Specimens cured under the same conditions (2) The concrete strength of structural entity with rebound core method should be tested according to different strength grades, and the test method should be the same condition curing specimen method; When the strength of specimens cured under the same conditions is not obtained or the strength of specimens cured under the same conditions does not meet the requirements, the rebound coring method can be used for inspection
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The equivalent curing age of concrete strength inspection can be taken as the corresponding age when the daily average temperature reaches 600 ℃ · d day by day, and should not be less than 14 days
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The age of 0 ℃ and below is not included
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In winter construction, the temperature for calculating the equivalent curing age can be taken as the actual curing temperature of structural components
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According to the actual curing conditions of structural components, the strength of specimens cured under the same condition is equal to that of specimens cured under the standard curing condition at the age of 28 days, which can be determined jointly by the supervisor, construction and other parties.
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