The following video is from Jiangsu news
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Recently, some owners in Huaiyin District, Huai’an City, Jiangsu Province reported to the reporter that after three delays, the developer finally informed them to accept the new house
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However, the owners found that there were still many quality problems in the house
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The supporting facilities such as fire control, greening, street lights and civil air defense were also not perfect
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What was the actual situation? Can such a house be delivered? There are serious water seepage cracks in the cement floor, which can be poked out with wood
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Shangduhui community is developed and constructed by Jiangsu oubeisha real estate company
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At present, there are five high-rise residential buildings in area a being delivered
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On the afternoon of April 27, the reporter followed the owner into a house in Building 8
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There were obvious water marks on the floor and ceiling of the kitchen
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In the bedroom, living room and other rooms, the owner took some tap water and splashed it at will
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The water soon seeped down
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At the same time, many cracks appeared on the ground
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In addition, the owner reflected that the concrete floor of the room is also very fragile, and it can be poked open with wood
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Mr
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Wang, the owner, said: “the cement floor is very hard and needs to be hammered
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Now we don’t know whether the conditions for delivery are like this
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Whether it’s cement mortar or soil, it’s the same as flour.” There are owners found that their balcony iron fence is very thin, there are certain security risks
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Mr
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Li, the owner, said, “can I fix this thin piece of iron and two screws? Moreover, the thing itself is very weak
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I can’t shake it when I break it a little.” Although the building has passed the acceptance, there are quality problems in the construction
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In order to understand the relevant situation, the reporter found the developer of shangduhui community
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The staff said that the main body of their building has passed the acceptance, meeting the housing delivery conditions agreed in the commercial housing sales contract
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Huaiyin District of Huai’an City, the staff of the Department of housing and urban rural development told reporters that the cement floor that was poked out of the hole used a new technology
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The original concrete floor below was used, and the light concrete with heat insulation and sound insulation was used in the upper layer
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According to the design specifications, although the strength of this light concrete is lower than that of ordinary cement floor, it is not as good as being poked out with wood, This shows that there are still some quality problems in the construction, in addition, it may not be found in the later acceptance
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Chen Dayong, a staff member of Huaiyin District Construction Engineering Quality Supervision Station in Huai’an City, said: “the qualified project does not mean that it is a zero defect and zero defect project, and there may be some local quality problems
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We firmly require the general contractor to maintain it in place.” Yin Chuanguang, construction technical director of shangduhui a district, said:“ It may be when it’s cold, or the maintenance is not watered in time
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” It is reported that the housing construction department also requires the construction party to rectify, reinforce and install protective facilities on the balcony to eliminate potential safety hazards
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Staff said that if the owners find their houses have quality problems, they can refuse to accept them
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A district of shangduhui community has been listed as “problem building” because of many delays in delivery
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In order to resolve the contradiction, the local government has held coordination meetings for many times to interview various responsible units and promote the construction progress of the project
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In view of some quality problems of the owner’s house, the developer is organizing construction personnel to actively repair, and the reporter will continue to pay attention to this
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You may know a lot about concrete watering and curing? On the one hand, the main purpose of concrete watering and curing is to keep the concrete structure moist enough inside and outside in the specified time, which is the basis of cement hydration heat
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On the other hand, only by controlling the external conditions of concrete watering and curing, can it help to control the temperature and avoid cracks
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In the process of concrete watering and curing, the operators often have the wrong understanding of the purpose of concrete watering and curing
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They just understand the concrete watering and curing as the specified operation, and they don’t have much value for the concrete structure itself
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Before concrete watering and curing, the construction personnel should be organized together to learn the process and principle of concrete watering and curing, clarify the purpose of concrete watering and curing, improve the attention to concrete watering and curing, and then guide the concrete behavior in concrete watering and curing work, so as to improve the quality of concrete watering and curing work
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Misunderstanding of the starting time of concrete watering and curing according to the relevant specifications and acceptance rules of concrete, the curing activities of covering and watering should be carried out in time within 12 hours after concrete pouring
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However, the actual situation is that some construction personnel, including technical personnel, mistakenly understand the time of concrete watering and curing as after 12 hours, which leads to various problems in the poured concrete, Especially at present, early strength cement and high performance concrete are frequently used
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If the concrete is not watered and cured, it will cause early cracking of concrete, and then temperature deformation and shrinkage deformation will form various cracks
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In the process of concrete pouring, the understanding of cement and concrete properties should be carried out to avoid the possibility of deviation of concrete properties
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At the same time, technical training should be carried out for concrete watering and maintenance personnel, and technical disclosure should be carried out for high-performance concrete and early strength cement, On the basis of determining the starting time of concrete watering and curing in time, the effective prevention of concrete early cracking is formed, the potential impact on the structure in the process of concrete watering and curing is avoided, the accumulation of quality problems is prevented, and the concrete construction effect is improved
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Misunderstanding of the length of concrete watering and curing
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At present, there is a misconception in the industry that the longer the concrete watering and curing time, the better the concrete structure
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Some enterprises even blindly extend the process of concrete watering and curing, which will not only increase the cost of concrete watering and curing, And it has a serious impact on the strength and quality of the concrete structure itself
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In the normal construction, the concrete curing is generally divided into 7 days or 14 days
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If the concrete is watered for a long time, it will increase the hydrate in the concrete, which will greatly increase the autogenous shrinkage deformation of concrete to a certain extent, and can not reduce the dry shrinkage of concrete, At the same time, it will also prolong the concrete shrinkage time, which is not conducive to the formation of the strength and stiffness of the whole concrete structure
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According to the key technology and design parameters of concrete construction, the control of concrete watering and curing time should be carried out with the factors of mix proportion, temperature and humidity as the control points, and the concrete structure with low water binder ratio should be watered in time, so as to realize the water filling from the outside
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When the water glue ratio is large, the time of concrete watering and curing should be appropriately extended
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On the basis of stabilizing the concrete structure, cracks caused by poor concrete watering and curing should be prevented
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For the concrete structure with admixtures and retarders, the time of concrete watering and curing should be determined according to the design and related scientific research, so as to effectively ensure the strength and stiffness of the concrete structure
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The wrong cognition of concrete final setting will form condensation water on the surface when concrete final setting, and many concrete watering and maintenance personnel make the judgment that it is not necessary to carry out watering and maintenance according to the existence of condensation water
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This is the wrong cognition that they have no in-depth understanding of concrete setting process and technical specifications
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The generation of condensation water does not mean that the whole concrete structure has no urgent need for water, It should be noted that the complex process before the final setting of concrete, especially in the concrete structure, there is still a large demand for water
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If it is not watered and cured in time, the surface condensation water will accelerate the drying shrinkage effect of the concrete surface after rapid evaporation, and there is no supplement due to the serious water shortage in the concrete, which will lead to the problems of drying shrinkage and cracking, Plastic shrinkage, autogenous shrinkage and dry shrinkage exist simultaneously in different parts of concrete, which seriously affects the performance and safety of the whole concrete structure.
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