Key points of high-rise building construction technology?

1 analysis of construction characteristics of high-rise buildings

1. 1 has complex structure and high foundation strength. At present, more and more high-rise buildings not only pursue the height, but also the appearance design is becoming more and more important. The landmark buildings of a city are characterized by complex structure and distinctive personality. Therefore, the complex structure of high-rise buildings also brings adverse consequences such as large construction amount to specific operations. In addition, the high-rise building has a heavy load on the foundation. In order to ensure the safety and durability of the building, the construction must be carried out within the load range of the foundation. We should pay attention to two aspects: first, in the design stage of high-rise buildings, we should ensure that the foundation is as free from atmospheric interference and influence as possible; Secondly, according to the characteristics of high-rise buildings, the foundation design should be adapted to the height of floors, and the principle of "the higher the building, the higher the requirement for foundation strength" should be followed.

1.2 has complicated conditions and long construction period. For low-rise buildings, the construction period of high-rise buildings is relatively long. Data show that the construction period of high-rise buildings is generally around 1 year, and there are many uncertain factors. For example, Guangdong Province, where the author is located, is likely to encounter adverse weather such as rainstorm and typhoon in summer and autumn, which brings many unfavorable conditions to the construction. In case of force majeure, the construction period will be delayed indefinitely, which will also lead to an additional increase in construction costs. In addition, high-rise buildings are generally built in cities with dense buildings, and the construction site will not be too empty, which not only restricts the foundation excavation and the stacking of equipment and materials on site, but also protects the surrounding buildings to some extent.

2 Analysis of key points of high-rise building construction technology

2. 1 Before construction, do a good job in design. According to the author's working experience in Guangdong Zhuhai Gree Real Estate Co., Ltd. for many years, generally speaking, except for complex landmark buildings, the structural structures of general high-rise buildings are similar to some extent, that is, they all adopt vertical structures. In building construction, the author thinks that it is particularly important to do a good job in the design of building construction methods, such as sliding mode method or flying mode method. On the one hand, we should consider the actual situation and construction conditions of the building, on the other hand, we should make full use of the characteristics of construction methods. For example, the slip-form method can make use of one-time mold making in time, tie steel bars and pour concrete at the same time, and jack up slowly. This construction method has two remarkable characteristics: first, it can effectively ensure the integrity and stability of the main structure of the building; Second, it can help the construction unit to reduce the overhead crossover operation and shorten the construction period as much as possible.

Taking Shenzhen International Trade Building as an example, it is called Shenzhen Miracle to build a floor in three days by slip-form method. After pouring concrete, the flying formwork method is used repeatedly from the floor to the upper floor by crane, which is generally suitable for the construction of cast-in-place slab-column structure (without column cap). Its remarkable feature is that the formwork can be lifted by lifting machinery as a whole and used layer by layer, which reduces the occupied area of temporary stacking formwork on the construction site, especially in downtown areas where construction land is tight. In a word, each construction method has its own advantages. According to the unique characteristics of high-rise buildings and construction sites, appropriate construction methods should be selected, or several methods should be organically combined, so as to optimize the allocation of resources and finally obtain higher economic benefits.

2.2 In the construction, do a good job of control (1) Dewatering construction technology In the construction of high-rise buildings, dewatering construction technology plays an important role in southern China, especially in rainy Guangdong Province. To do a good job in dewatering construction, the author thinks that we should start from the following aspects: First, investigate the actual situation of high-rise building areas and take Guangzhou as an example to explain in detail. If we want to consider the stratigraphic structure and lithologic characteristics of this area, generally speaking, thick silty clay will have high toughness and strength, and we should also consider the hydrological and weather conditions of this city. Guangzhou belongs to a typical subtropical monsoon climate, and precipitation is generally concentrated in summer and autumn, so special attention should be paid to the treatment of building water in rainy season. Secondly, on the basis of basic conditions, we will build precipitation treatment facilities, observe natural water levels and make relevant records. In order to ensure normal construction, prevent slope collapse and foundation bearing capacity decline, it is necessary to do a good job of foundation pit dewatering. The author thinks that open ditch drainage method and well point dewatering method can be used to solve this problem.

(2) Concrete construction technology Concrete construction technology is an inevitable technology in modern high-rise buildings, and appropriate measures should be taken during construction to ensure the quality of concrete construction. The author thinks that the most important thing is to choose the appropriate concrete mixture ratio. On the one hand, cement with low hydration heat should be used, on the other hand, a certain amount of micro-expansive agent should be added to mass concrete to form partial shrinkage-compensating concrete. When pouring concrete, the method of layered pouring can be adopted, which can effectively dissipate the internal heat of concrete and form strong crack resistance.

(3) Steel structure reinforcement construction technology is a common structural material in modern buildings, and it is also an important support to ensure the high strength of high-rise buildings. Although it has certain advantages, it is precisely because of the strong thermal conductivity of steel itself that once a fire breaks out in a building, the whole steel structure will be deformed. Therefore, when applying steel structure construction technology, fire prevention measures must be taken. In the specific construction process, the following work should be done well: First, do a good job in the inspection and storage of steel raw materials, and it is strictly forbidden to use unqualified steel in the project; When stored, the steel bars should be padded with wooden boards to ensure at least 20 cm from the ground. Secondly, when processing steel materials, it should be processed according to the size of components, the requirements of design drawings and the thickness of concrete protective layer. Finally, in the process of steel bar welding, different welding methods should be adopted according to the grade and diameter of steel bar. If the rebar diameter is small, the rebar grade is low, and the welding capacity is 100- 150 kva, continuous flash butt welding can be used.

3 Conclusion

High-rise buildings are the inevitable product of urbanization. The increase of their number and scale not only adds a landscape to the city, but also solves the problem of insufficient urban space resources to some extent. However, due to its unique characteristics, such as modern design and complex structural level, it also makes the site construction technology more difficult. Therefore, it is necessary for specific construction personnel to constantly sum up and improve their own construction experience, adopt appropriate construction methods in the construction process, and strive to improve the main construction techniques to ensure the final high-quality completion of the building.

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