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 upright, bridge, door, suspended, hanging, cantilever, and climbing scaffolding.

Different types of construction projects require different types of scaffolding. Most bridge support scaffolding uses bowl coupling scaffolding, but some also use door frame scaffolding. For the construction of the main structure, most ground scaffolding uses clamp scaffolding, with the longitudinal spacing of the scaffolding uprights typically ranging from 1.2 to 1.8 meters; the transverse spacing usually ranges from 0.9 to 1.5 meters.

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

1. The load variability is quite significant.

2. The connecting 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 variation in node performance.

3. Scaffold structures and components have initial defects, such as initial bending of rods, corrosion, significant assembly size errors, and eccentric loading, etc.

4. The connection points with the wall exhibit significant variation in the 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, which is multiplied by the structural resistance, is determined by calibrating with the 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 the fundamental condition for design calculations.