Identify hazards at the construction site and develop measures for the following high-risk sub-projects:
1. Large scaffolding exceeding 20 meters in height; attached integral lifting scaffolding; cantilever scaffolding; and 6.5-meter-high scaffolding;
2. Excavation work involving trenches exceeding 1.5 meters in depth and foundation pits exceeding 5 meters in depth;
3. Installation, lifting, and dismantling of tower cranes and external elevators;
4. Lifting and hoisting operations;
5. Fire safety for decoration projects.
Scaffolding Details:
1. Structural and decorative scaffolding should be erected in accordance with relevant regulations, using steel pipes with an outer diameter of 48-51 mm and a wall thickness of 3-3.5 mm, free of severe rust, bends, flattening, or cracks. 2. The spacing between vertical posts of structural scaffolding shall not exceed 1.5m, the spacing between longitudinal horizontal posts (large crossbars) shall not exceed 1.2m, and the spacing between transverse horizontal posts (small crossbars) shall not exceed 1m. For decorative scaffolding, the spacing between vertical posts shall not exceed 1.5m, the spacing between longitudinal horizontal posts (large crossbars) shall not exceed 1.8m, and the spacing between transverse horizontal posts (small crossbars) shall not exceed 1.5m.
3. The scaffolding foundation must be flat and solid, with drainage measures in place to meet the requirements for supporting the scaffolding and preventing subsidence and water accumulation. The scaffolding must be supported on a base (support) or full-length scaffolding boards.
4. The scaffolding work surface must be fully covered with scaffolding boards, no more than 20cm from the wall, and no gaps, probe boards, or flying boards are allowed. A guardrail and an 18cm high toeboard should be installed on the outside of the working surface.
5. If the clearance below the scaffolding construction level exceeds 3m, a horizontal safety net must be installed below. Scaffolding planks may be used if the gap between the inner edge of the double-row scaffolding and the exterior wall of the structure is unprotected.
6. The entire scaffolding structure should be enclosed along the inside of the outer scaffolding with a dense mesh safety net. The safety nets must be securely connected, tightly enclosed, and fixed to the scaffolding structure.
7. Scaffolding must be connected to the structure according to the floor level. The vertical distance between connection points must not exceed 4m, and the horizontal distance must not exceed 6m. Connections must be made of rigid material. Continuous scissor bracing must be installed to prevent deformation of the entire structure. The width of the scissor bracing must not exceed 7 vertical poles, and the angle between the diagonal poles and the horizontal plane must be 45-60 degrees. Scaffolding over 20m in height must have load-bearing measures.
8. Scaffolding over 20m in height and special scaffolding must have a design plan, approved by the chief engineer, and undergo acceptance procedures. 9. The operating load for internal and external load-bearing scaffolding used for structures shall not exceed 270 kg/m2. The operating load for internal and external scaffolding used for decoration shall not exceed 200 kg/m2.
10. A safe operating distance must be maintained between the outer edge of the scaffolding and the edge of external overhead power lines in accordance with regulations. Effective and reliable protective measures must be implemented in special circumstances. Wire guards should be made of non-conductive materials, with their foundation poles buried 30-50 cm below ground level. The entire wire guard must have reliable support and connection measures to ensure the stability of the scaffolding.
11. Pedestrian walkways must be no less than 1m wide, with ramps no more than 1:3 in slope. Material transport walkways must be no less than 1.5m wide, with ramps no more than 1:6 in slope. Platforms must be provided at corners and protected according to edge protection requirements. Anti-slip strips must be spaced no more than 30 cm apart.
12. Scaffolding support requirements for edge protection, balconies, and foundation pits shall comply with the project’s scaffolding safety management system.
Post time: Aug-19-2025