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, 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 the construction of the main structure, the most common type of scaffolding is the clamp-type, with the longitudinal spacing of the scaffold uprights generally being 1.2~1.8m; the transverse spacing is usually 0.9~1.5m.

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

1. The load variability is quite significant.

2. The connection points of the 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. The scaffolding structure and components have initial defects, such as initial bending of rods, rust, significant installation size errors, and eccentric loading, all of which are considerable.

4. The connection points to the wall exhibit significant variation in their constraint on the scaffolding. Research on the aforementioned 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 the basic condition for design calculations.