Development course and trend editor
The early 80s of last century, China has introduced from abroad, door scaffolding, bowl button scaffolding and other types of scaffolding. Door scaffolding in many projects in the country has also been a large number of applications, and achieved good results, due to door scaffolding product quality problems, this scaffolding has not been a lot of promotion and application. In the country and built a number of door scaffolding production plant, most of its products according to foreign to map processing. Bowl button scaffolding is a new scaffolding to promote the use of a scaffolding, but the use of the surface is not wide, only part of the region and part of the application.
Since the 1990s, some domestic enterprises to introduce advanced foreign technology, the development of a variety of new scaffolding, such as plug scaffolding, CRAB module scaffolding, disc scaffolding, square tower scaffolding, and various types of climbing. To 2013, the domestic professional scaffolding production enterprises more than 100, mainly in Wuxi, Guangzhou, Qingdao and other places. Technically speaking, China's scaffolding enterprises have the ability to produce and produce a variety of new scaffolding. But the domestic market has not yet formed, the construction enterprises on the new scaffolding awareness is insufficient.
With the emergence of a large number of modern large-scale building system, fastener steel scaffolding can not meet the needs of the development of construction, vigorously develop and promote the use of new scaffolding is a priority. Practice has proved that the use of new scaffolding is not only safe and reliable construction, loading and unloading speed, and scaffolding with steel can be reduced by 33%, assembly and demolition work efficiency more than doubled, the construction costs can be significantly reduced, the construction site civilization, clean. 
Different types of construction use scaffolding for different purposes. Bridge support frame using bowl buckle scaffolding of the majority, but also the use of door scaffolding. The main structure of the construction of scaffolding scaffolding use the majority of scaffolding, scaffolding pole vertical distance is generally 1.2 ~ 1.8m; span is generally 0.9 ~ 1.5m.
Scaffolding compared with the general structure, its working conditions have the following characteristics:
1, suffered a large load variability;
2, fastener connection nodes are semi-rigid, and the node rigid size and fastener quality, installation quality, node performance there is a big variation;
3, scaffolding structure, the existence of initial defects in the components, such as the initial bending of the bar, corrosion, erection size error, the eccentric and so on are larger;
4, with the wall of the connection point, the scaffolding of the binding variation. The research on the above problems lacks the system accumulation and statistical data, and does not have the independent condition of probability analysis. Therefore, the adjustment coefficient of the structural resistance multiplied by less than 1 is determined by the calibration with the safety factor used in the past. Therefore, the design method used in this specification is essentially semi-empirical and semi-empirical. Scaffolding to meet the requirements of this specification is the design and calculation of the basic conditions