High-rise building development in China at the beginning of twentieth Century, the development time compared with abroad late, but due to the rapid pace of development, high-rise buildings in our country has been the key technology, and has been applied to the actual construction. At present, high-rise buildings have been built in the Shanghai World Financial Center (492 meters, 101 floors), Nanjing Zifeng tower (450 meters), Shanghai Jinmao Tower (421 meters), the Hongkong international financial center 2 (415 m), Taiwan 101 (508 meters), Guangzhou CITIC Plaza (391 meters), Shenzhen is the most expensive land building (384 meters).
In the construction of high-rise buildings in Shanghai Center (about 632 meters) and Shenzhen Ping An Financial Center (about 668 meters).
1 steel structure construction technology
Steel structure is widely used in civil engineering construction because of its light weight, good seismic performance, high strength and good plasticity. The characteristics of the construction technology of steel structure is steel beams, column frame made of steel plate, each frame between bolts and rivets or take the welding connection, is one of the main architectural form of [1]. using the construction technology of steel structure in high-rise buildings have more stringent requirements, whether to add on for welding or steel structure hoisting, demolition etc.. Because high-rise building itself because of the higher floors, safety is the primary factor to consider, so for details and more excellence, not any flaws. Shenzhen Wang building as an example, the main structure of the steel structure, in the construction process is also a comprehensive use of steel construction technology.
2 integral climbing method and integral sliding mode method
The whole climbing mould method using the "principle of monkey bar", is mainly composed of inner and outer climbing frame and the inner and outer templates composed of these, after climbing frame and one-time assembly template and climbing frame and lifting on the template, the template and enhance the interaction of the two depends on the climbing frame, alternately and rely on each other. In order to use this technology to support each other to achieve the building construction objective of casting layer by layer structure of concrete, so that the concrete wall pouring in and outside at the same time, the level of [2]. and the complete synchronous construction of whole slide template rule is the bracket and the whole beam two together, smooth the top place after concrete pouring, to reach the mouth template the upper floor level can be carried out after the level of construction structure. The whole climbing formwork method and the integral sliding mode method are the key technologies that must be used in the super high-rise building. The two have the same points and different points. They only need a template assembly, which greatly reduces the construction time, while a higher degree of mechanization, saving the template and labor, which is very important for high-rise buildings. The difference between the two lies in whether through the relative movement between the template and concrete to complete the construction. In our country, the overall climbing mould method and whole sliding mode technique has been mature, has formed a complete system, built in 1995, Wuhan International Trade Building or Cetra Building has used the overall sliding mode method, after the completion of the Shanghai world financial center and other high-rise buildings have adopted key technologies for this.
3 inverse method
As the most advanced construction technology in the super high-rise building, the reverse construction method is mainly used for some special requirements of the project or the traditional construction methods can not meet the requirements. The principle of inverse method is the use of the interior of the building pouring intermediate supporting pile and pile, the axis along the building basement construction of underground continuous wall or other support structure, make it as the building is an important support to bear the construction load and the weight of the superstructure construction plate at bottom, by this point by the earthwork and pouring underground structure of each layer under the layer excavation due to the structure of [3]., until the bottom cover the ground floor has been completed, to provide convenient conditions for the construction of the superstructure, so you can also uplayered on the ground structure construction, until the completion of construction. The reverse can be divided into full inverse method and semi inverse method, top-down and hierarchical top-down four basement, global financial center of Shanghai and Shenzhen is the most expensive land building basement by inverse method and semi inverse method to complete the. Compared with the traditional construction technology, the reverse construction method has the advantages of saving the construction period and good force. Because of the particularity of the top-down, the promotion of domestic on top-down implementation are among countries has been wildly beating gongs and drums, policies to promote the use of reverse as the key technology of high-rise building, although the lack of practice and inverse technology, but I believe that in the near future these problems will be smoothly done or easily solved and ushered in its heyday, in China.
4 concrete construction technology
High rise building due to the high floor, so the strength of concrete, durability requirements are also improved. High strength and high performance, lightweight concrete is used more and more in the construction process of super high-rise building. Now, most of the high-rise building is the use of pumping concrete technology. The high strength and high performance concrete has promoted the development of pumping concrete technology. At present, the "double mixing technology", which is the mixture of pulverized coal ash and chemical admixtures, reflects the comprehensive utilization of construction technology. The use of pump concrete technology reflects the progress and development of construction technology of high-rise building in China, although China's high-rise building started relatively late, but still in recent decades has made breakthrough, and will make greater achievements in the construction industry.
5 concluding remarks
With the rapid development of China's high-tech economy, accelerate the process of city, city contradiction between population and land resources become increasingly prominent. In order to solve this problem, the development of the times, high-rise building has become the necessary facilities of modern society. The super high-rise building is becoming more and more popular in China, which is the inevitable requirement of the development of social economy and the product of the development of the times. Due to the increase in the number of high-rise buildings, the technical requirements are more stringent, not only to ensure the safety of the building, but also for the architectural design and functional requirements are also increasing. The construction technology of our high-rise building is both opportunity and challenge. At present, China's super high-rise building technology has tended to a high level in the world, but also has a complete Chinese characteristics of the super high-rise building technology system. However, in view of the actual development of our country, although the super high-rise building has been widespread, but there are still uneven distribution problems. The first big city high-rise building technology is already mature, high-rise building in the two or three line of the city is still in the initial stage, in the face of these problems, as the construction industry workers in practice need to constantly sum up experience, to perfect the domestic technology system at the same time also should pay attention to learn from foreign advanced experience, the development of high-rise building technology development first-tier cities at the same time the main meaning of the two or three line of the city's balance. Only by constantly learning to improve, and to practice them in order to improve the technical level of China's high-rise buildings, promote the development of the city, to promote economic and social progress.
Reference
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[3] Qian Feng, Wang Yanjin. Analysis on the selection of super tall building structure system [J]. Heilongjiang science and technology information, 2011 (35): 7