[abstract] This paper summarizes the main characteristics of concrete pouring construction technology in building construction, and studies the practice of concrete pouring technology. This paper clarifies the matters needing attention in concrete construction, aiming at the rational application of concrete pouring construction technology and the continuous improvement of construction quality in combination with the concrete construction situation of construction engineering, combined with past practice and current science and technology, and expounds in detail.
[keywords] building construction; concrete pouring construction technology; practice
Article No. 2095-4085 (2016) 07-0138-02
In the construction, construction operation should be strictly standardized, and the technical management and control of construction personnel should be well done. Staff members should be regularly organized to learn and train relevant theoretical knowledge. In the actual construction process, the operation requirements and specifications should be clearly defined, and the construction should be carried out in accordance with the specific operation process.
Main characteristics of concrete pouring construction technology
In building construction, the emphasis of concrete pouring construction technology is large-scale concrete construction project. Compared with general concrete construction, this kind of large-volume concrete construction can achieve the characteristics of large amount of concrete, and the quantity and density of steel bar are large. It has very high requirements for construction, and its volume and thickness are very large [2,3]. After the above-mentioned concrete pouring construction technology features appear, it will increase the difficulty of operation in construction, which has a serious impact on the overall quality of building construction and prevents concrete from cracking. It can be seen that the construction requirements of this technology are very high. The pouring construction will change with the height of the building, which will make the concrete bear a larger weight and the construction space will be limited. These factors will increase the difficulty of construction. Therefore, appropriate construction technology is needed to avoid the above or possible shortcomings of construction. In order to improve the overall construction quality of pouring construction and maintain the overall benefits of enterprises. Concrete engineering, mainly including water, aggregate, admixtures and different types of minerals, is made by mixing proportionally according to relevant regulations. The mixing concrete should meet the standards of uniformity, compactness and quality, and be selected according to the requirements of fluidity, cohesiveness and water retention. With the increase of the number of buildings, the filling voids in pouring construction will be directly affected. The proportion of concrete modulation should be combined with the concrete standards of Engineering pouring, and the construction materials and construction technology that meet the quality standards should be selected and put into use after the practice of precision technology in the laboratory.
Practical Research on Concrete Casting Technology
Application of 2.1 Concrete Casting Construction Technology
Before concrete pouring, the mixing concrete should be transported to the construction site according to the scientific proportion. The initial solidification time is 3 hours. It is forbidden to add water on the way. After arriving at the construction site, appropriate amount of expansion agent and water reducing agent can be added according to the specific conditions. After completion of the pouring work, the partition treatment of concrete and the partition pouring treatment of concrete are carried out, and the operation is carried out through the correct process. When vibrating concrete, the vibrating rod should be inserted in time and pulled out at the first time. The main purpose of the above operation is to ensure the compactness of concrete. The grouting of concrete should be carried out before the concrete is not solidified, in order to avoid the appearance of fracture, and the pressing and plastering work should be completed in three steps. Concrete pouring construction should be continuous and uninterrupted. If adverse events occur, it needs to be dealt with by emergency plan in the first time, so as to improve the efficiency of concrete construction. After concrete pouring construction, we should control the surface temperature, internal temperature, surface temperature and atmospheric temperature difference of concrete to prevent adverse events.
2.2 Key Construction Technology in Casting Concrete
(1) Layered construction should be comprehensive. In the process of pouring, the layered pouring of the project should be comprehensive until all the pouring work is completed. During the first full-scale pouring construction process, it is necessary to ensure that the whole project is poured, and then the next pouring is carried out, which is generally suitable for moderate and small construction area. The construction is carried out on short side to long side, at the same time through both sides to the middle, and at the same time through the middle to both sides of the casting construction.
(2) Key points of layered and segmented buildings. Because of the large amount of work, or by the impact of mixers and excavators, the construction is greatly hindered. For this reason, layered and segmented pouring construction should be adopted. It is mainly poured through the bottom, and then completed the pouring construction step by step until the completion of the pouring operation. It should be noted that the building body should not be too thick or too long in the application process of this pouring construction technology.
(3) Key points of layered casting on the remaining surface. The layered construction technology of the remaining surface is mostly used in buildings with thicknesses more than three times. In concrete construction, special-shaped buildings should be ensured to be located at the top. At this time, concrete constitutes a natural slope with a slope ratio of 1:3. In actual construction, the operation process of concrete vibration is as follows - up, which can fundamentally improve the overall quality of Engineering construction. The larger volume of concrete, because of the larger section area, will lead to crack phenomenon, its causes and shrinkage, cooling have a greater relationship. Therefore, when pouring concrete into large-scale building structures, relevant measures should be taken to control the probability of cracks in concrete construction.
2.3 Concrete Building Maintenance Technology
After finishing the press-plastering construction, the concrete construction work is basically completed. At this time, the concrete maintenance construction should be strengthened. Cover the surface of concrete with a layer of construction material which is not absorbed, so as to avoid dry cracking and wet cycling caused by water shortage of concrete. Usually, the temperature of concrete should be controlled at about 15 degrees and the time should be controlled for one month in order to ensure the safe implementation of concrete hydration construction.
3 matters needing attention in concrete building
3.1 Strict Control of Concrete Strength
The criterion for judging the quality of concrete is the compressive capacity of concrete. The compressive capacity of concrete is proportional to the strength of cement in concrete. Therefore, in the implementation of concrete strength allocation, we need to do a good job in the selection of cement. The proportion of water and ash will affect the strength of concrete. The larger the proportion of water and ash, the lower the strength of concrete. On the contrary, the smaller the proportion of water and ash, the higher the strength of concrete. Therefore, it is necessary to do a good job in the management and control of concrete quality in order to control the quality of cement.
3.2 Strict control of construction distance
In order to avoid segregation during pouring, it is necessary to measure the distance between hopper and foundation pit of dumper truck. The basic height of concrete should be controlled within 2 m, and the segregation of concrete should be observed strictly. If the above phenomena occur, the re-pouring construction should be carried out. Because the thickness and volume of pouring buildings are relatively large, the difficulty of pouring construction is also greater, and it is difficult to complete all the construction at one time. Therefore, layered pouring construction should be done to prevent concrete from being too thick and causing honeycomb holes.
3.3 Strictly Control the Intermittent Time of Casting Construction
Generally speaking, there should be no intermittence in the actual pouring process of concrete, and continuous construction should be maintained. However, in actual operation, because of unexpected events, special circumstances, construction needs to be intermittent, at this time, the relevant staff need to do a good job in the calculation of the length of intermittent time.
In the concrete pouring construction process, the concrete type should be reasonably selected according to the specific requirements of the project construction, and the concrete pouring construction should be carried out according to the requirements of temperature and time to ensure that the concrete strength meets the specific requirements of the project. When the quality of concrete raw materials reaches the standard, it is necessary to do a good job in the construction of concrete mix proportion and strengthen the detection of the strength of concrete. In order to ensure the overall quality of concrete pouring construction, a one-week concrete strength experiment can be carried out, which can further promote the concrete to meet the requirements of strength and construction quality.
4 Conclusion
Concrete construction quality and construction technology can directly affect the overall construction efficiency of construction. In the process of pouring, proper pouring method and construction technology should be chosen. Before concrete pouring construction, reasonable and feasible construction schemes and emergency plans should be formulated to ensure the overall construction efficiency of the project.
Reference:
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