Scaffolding is an indispensable piece of construction equipment. It is necessary to erect scaffolding nearby for tasks such as bricklaying, concrete pouring, plastering, decoration, painting, and installation of structural components. This allows for construction operations, material storage, and short-distance horizontal transport when necessary. The safety regulations for erecting scaffolding vary depending on the type of scaffolding used. Generally, scaffolding can be divided into ground-supported scaffolding, attached lifting scaffolding, cantilevered scaffolding, and frame scaffolding.
1. Ground-supported scaffolding: When constructing the foundation for ground-supported scaffolding, the ground must be level and firm. There should be no standing water in the erection area. Drainage ditches or other drainage measures should be provided on the outer side and around the scaffolding. Sufficient load-bearing capacity is required; the support pole base plates should meet the load-bearing requirements, and the bottom surface of the base should ideally be 50-100mm higher than the natural ground level.
2. Attached Lifting Scaffolding: When installing attached lifting scaffolding, special attention must be paid to whether the equipment possesses the four main devices: a fully automatic fall protection device, an anti-overturning device, and a synchronization or load control device. It is also necessary to verify that its technical performance meets the required specifications. The bottom working surface of the scaffolding must be fully covered with scaffold boards without gaps, protruding boards, or loose boards. A horizontal safety net is required below the scaffolding, or bamboo plywood can be used under the scaffold boards. The gap between the scaffolding and the structure should be protected by an openable flap every two layers above the bottom of the scaffolding to ensure vertical protection and effectively prevent injuries from falling small objects such as rebar ends, fasteners, and concrete blocks.
3. Cantilevered Scaffolding: Cantilevered scaffolding primarily uses cantilever beams installed at the building’s edge. These beams transfer all or part of the scaffolding load to the building structure. The scaffolding is securely connected to the building via tie rods to meet construction needs. In practice, I-beams and channel steel of 16# or higher are typically used as the foundation; threaded steel is strictly prohibited. When using 16# I-beams, a steel bar with a diameter of ≥25mm should be welded 100mm from the front end of the cantilever beam to secure the uprights (preventing displacement). Welding must be full (spot welding is not allowed) to ensure weld quality. The steel bar should extend 200mm above the I-beam. Furthermore, the I-beam must be fully coated with yellow anti-rust paint.
4. Frame Scaffolding: Frame steel pipe scaffolding must comply with the current industry standard “Safety Technical Specification for Frame Steel Pipe Scaffolding in Building Construction” (hereinafter referred to as the “Specification”) JGJ128. The main components of the portal steel pipe scaffold are welded uprights, horizontal bars, and reinforcing bars. The foundation for the scaffold should meet the project plan requirements, be level and solid, and have drainage measures. The bottom of the scaffold needs to be equipped with base plates and upright bases. The ground support bars and other components of the scaffold must meet the requirements of the relevant specifications. Typically, the angle between the diagonal bracing of the scaffold and the ground should be between 45° and 60°, and it should be fixed to the uprights using swivel couplers. The installation of scissor bracing and cross bracing is also important. Furthermore, the vertical deviation of the portal frame uprights should meet the specifications.
Post time: Nov-03-2025