Scaffolding refers to the construction site for the workers to operate and solve the vertical and horizontal transport and erected various stents. Common terminology in the construction industry, refers to the construction site used in the external walls, interior decoration or high height can not be directly the construction of the place. Mainly for the construction staff up and down operations or external safety net enclosure and high-altitude installation components, said white is the shelf, scaffolding production materials are: bamboo, wood, steel or synthetic materials. Some projects are also used as scaffolding templates, in addition to the advertising industry, municipal, traffic, roads and bridges, mines and other departments are widely used.
Different types of construction use different scaffolding and template stent. Bridge support frame using the bowl buckle scaffolding of the majority, but also the use of door scaffolding. The main structure of the construction of scaffolding use scaffolding scaffolding majority, 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,
4, with the wall of the connection point, the scaffolding of the binding variation. The study of the above problems lacks the system accumulation and statistical data, and does not have the independent probability analysis condition. 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-probabilistic and semi-empirical. Scaffolding to meet the requirements of this specification is the design and calculation of the basic conditions.