Scaffolding is a working platform erected to ensure smooth construction of all construction processes.
According to the installation position, it can be divided into external scaffolding and scaffolding; according to different materials, it can be divided into wooden scaffolding, bamboo scaffolding and steel pipe scaffolding; it can be divided into vertical scaffolding, bridge scaffolding, portal scaffolding, suspended scaffolding, according to the structure.
Hanging Scaffolding, Pick Scaffolding, Climbing Scaffolding.
Different types of construction use different types of scaffolding.
Most of the bridge support racks use bowl-buckle scaffolding, and there are also door-type scaffoldings.
The main structure of the construction landing scaffolding using fasteners mostly, the vertical distance of the scaffold pole is generally 1.2 ~ 1.8m; horizontal distance is generally 0.9 ~ 1.5m.
Compared with the general structure, the scaffold has the following characteristics:
1, the greater the variability of the load;
2. The connection node of the fastener is semi-rigid, and the rigidity of the node is related to the quality of the fastener and the installation quality. There is a large variation in the performance of the node.
3. There are initial defects in the structure and components of the scaffold, such as the initial bending and rusting of the rods, the erection of the dimensional error, the loading eccentricity, and so on.
4. The connection point with the wall has a greater variation in the constraints of the scaffolding.
The research on the above problems lacks systematic accumulation and statistical data and does not have the conditions for independent probabilistic analysis.
Therefore, the value of the adjustment coefficient that multiplies the structural resistance 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.
The scaffolding meets the structural requirements specified in this specification is the basic condition for design calculation.