Scaffolding is a working platform constructed to ensure the smooth progress of various construction processes. It is categorized by its placement into external and internal scaffolding; by material into wooden, bamboo, and steel pipe scaffolding; and by construction form into vertical pole, bridge, gate, suspended, hanging, cantilever, and climbing scaffolding.

Different types of construction projects require different types of scaffolding. Most bridge support structures use bowl clamp scaffolding, with some using door frame scaffolding. For main structure construction, most ground scaffolding uses clamp scaffolding, with the longitudinal spacing of the scaffolding posts typically 1.2~1.8m; the transverse spacing is generally 0.9~1.5m.

Scaffolding, compared to general structures, has the following characteristics in working conditions:

1. The load variability is quite significant.

2. The connection nodes of fasteners are semi-rigid, and the rigidity of the nodes is related to the quality of the fasteners and the installation, with significant variations in node performance.

3. The scaffolding structure and components have initial defects, such as initial bending of the rods, rusting, significant dimensional errors in assembly, and eccentric loading, etc.

4. The connection points with the wall exhibit significant variation in their constraint on the scaffolding. Research on the above issues lacks systematic accumulation and statistical data, and does not meet the conditions for independent probability analysis. Therefore, the adjustment coefficient multiplied by the structural resistance is determined by calibrating with coefficients used in the past. Consequently, the design method adopted in this specification is essentially a semi-probabilistic and semi-experiential approach. Compliance with the structural requirements specified in this specification is a fundamental condition for design calculations.