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 supports use bowl coupling scaffolding, although some also use door frame scaffolding. For the construction of the main structure, the most common type of scaffolding used is the clip scaffolding, with the longitudinal spacing of the scaffold posts typically 1.2~1.8m and the transverse spacing generally 0.9~1.5m.

Ladders offer the following characteristics in working conditions compared to general structures:

1. The load variability is quite significant.

2. The connecting nodes 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. Scaffold structures and components have initial defects, such as initial bending of rods, rust, significant setup dimension errors, and eccentric loading, all being quite large.

4. The connection points with the wall exhibit significant variability in their constraint on the scaffold. Research on the aforementioned issues lacks systematic accumulation and statistical data, and does not meet the conditions for independent probability analysis. Therefore, the value of the adjustment coefficient, which is multiplied by the structural resistance and is less than 1, is determined by calibrating it against previously used coefficients. Consequently, the design method adopted in this specification is essentially a combination of semi-probabilistic and semi-empirical approaches. Compliance with the structural requirements specified in this specification is the basic condition for design calculations.