Scaffolding erection specifications
Here are the main scaffolding erection specifications:
- Construction Plan
- A special construction plan for the scaffolding should be prepared based on the project characteristics before the scaffolding erection and demolition operations, and it should be implemented after being approved.
- The special construction plan for the scaffolding should be disclosed to the construction site management personnel and operators for safety – technical disclosure before the scaffolding erection and demolition operations.
- Foundation Treatment
- The foundation of the scaffolding should meet the requirements of the construction plan.
- Drainage measures should be set up, and the construction site should not be water – logged. In winter construction, anti – frost heave measures should be taken.
- Material and Component Requirements
- Steel Pipes: They should be made of No. 3 steel welded steel pipes with an outer diameter of 48 mm and a wall thickness of 3.5 mm, and should have product quality certificates and inspection reports. The surface should be straight and smooth, without cracks, scabs, delaminations, misalignments, hard bends, burrs, indentations, and deep scratches. The maximum mass of each steel pipe should not be greater than 25 kg, and it is strictly prohibited to drill holes in steel pipes.
- Fasteners: New fasteners should have a production license, product quality certificate, and inspection report. Old fasteners should be inspected for quality before use. Those with cracks or deformations are strictly prohibited from use, and bolts with slippage must be replaced. Both new and old fasteners should be treated with rust prevention.
- Scaffold Boards: The scaffold boards on the working layer of the scaffolding should be fully covered and laid firmly, meeting the requirements of stability and reliability. Steel scaffold boards connected by hooks should be equipped with self – locking devices and locked with the horizontal bars of the working layer.
- Connection between the Frame and the Building Structure
- The connection members should be rigid members that can bear pressure and tension, and should be firmly connected to the engineering structure and the frame.
- The horizontal spacing of the connection points should not exceed 3 spans, the vertical spacing should not exceed 3 steps, and the cantilever height of the frame above the connection points should not exceed 2 steps.
- At the corners of the frame and the ends of the open – type working scaffolding, additional connection members should be added. The vertical spacing of the connection members should not be greater than the floor height of the building, and should not be greater than 4m.
- Pole Spacing and Scissor Braces
- The spacing of the vertical poles and the step distance should be determined through design.
- Vertical scissor braces should be set on the longitudinal outer facade of the working scaffolding. The width of each scissor brace should be 4 – 6 spans, and should not be less than 6m or greater than 9m. The angle between the inclined rod of the scissor brace and the horizontal plane should be between 45° and 60°.
- When the erection height is below 24m, a scissor brace should be set at each end of the frame, at the corners, and at intervals of no more than 15m in the middle, and should be continuously set from the bottom to the top. When the erection height is 24m or above, it should be continuously set on the entire outer facade from the bottom to the top.
- Safety Protection Facilities
- The outer edge of the working layer of the scaffolding should be provided with guardrails and toe – boards. The working layer of the scaffolding should be closed with safety nets. When dense – mesh safety nets are used for closure, the dense – mesh safety nets should meet the fire – retardant requirements.
- Along the building under construction, a horizontal protection should be set at every 3 floors or a height of no more than 10m.
- Erection Sequence
- The erection of the floor – supported working scaffolding and the cantilevered scaffolding should be carried out simultaneously with the construction of the main structure. The one – time erection height should not exceed 2 steps of the top – most connection member, and the free height should not be greater than 4m.
- The reinforcing members such as scissor braces and inclined braces should be erected simultaneously with the frame.
- The erection of the component – assembled scaffolding should be extended from one end to the other end, erected step by step from bottom to top, and the erection direction should be changed layer by layer.
- Inspection and Acceptance
- The scaffolding should be inspected and accepted before use, and regularly inspected during use. It should also be inspected and accepted after any incident that may affect its safety, such as strong winds, heavy rains, or impacts.
- The inspection should be carried out by a qualified person, and the inspection content should include the foundation, poles, fasteners, connection members, scaffold boards, safety protection facilities, etc. of the scaffolding.
Share:
RELATED POSTS
- What should be confirmed before climbing on a scaffold
- How heavy are manhole covers
- What are the characteristics of system scaffolding？
- What is a manhole cover
- Square manhole covers
- How much does a manhole cover weigh
- Why are manhole covers round
- Ductile iron manhole cover specifications, models and sizes
