Scaffolding FAQ

No. 1 . Design
1. The quality of steel pipes, top supports, bottom supports and fasteners is generally unqualified in domestic scaffolding. In actual construction, theoretical calculations have not taken these into account. It is best to take a certain safety factor in the design and calculation process;
2. It is also necessary to have a clear understanding of heavy-duty scaffolding. Generally, if the thickness of the floor slab exceeds 300, it should be considered to design according to the heavy-duty scaffolding; if the scaffolding load exceeds 15KN/㎡, the design plan should be organized by experts to demonstrate. At the same time, it is necessary to distinguish which parts of the steel pipe length change has a greater impact on the bearing capacity. For the formwork support, it should be considered that the length of the centerline of the top horizontal rod from the formwork support point should not be too long, generally less than 400m. In the calculation of vertical poles, the uppermost step and the bottommost step generally bear the largest force and should be used as the main calculation points; when the bearing capacity does not meet the requirements, the vertical pole should be added to reduce the vertical and horizontal spacing, or the horizontal pole should be added to reduce the step spacing.
No. 2 . Construction
For example, the sweeping rod is missing, the distance between the sweeping rod and the ground is too large or too small, and the vertical and horizontal junctions are not connected; Anti-fall nets; open scaffolding without diagonal braces; too large spacing between small cross bars under the scaffolding; loose fasteners or slippery fasteners; scissors braces not connected in the plane, etc.
No. 3 . Deformation accident
1. When the scaffold is unloaded or the tensioning system is partially damaged, immediately repair it according to the unloading method formulated in the original plan, and correct the deformed parts and rods. If the deformation of the scaffold is corrected, set up a 5t reverse chain in each bay first. After the rigid zipper is made, tighten the wire ropes at each unloading point to make the force evenly distributed, and finally release the reverse chain.
2. For the local deformation of the scaffolding caused by the settlement of the foundation, set up splay braces or shear braces on the transverse section of the double-bent frame, and erect a group of poles in every other row until the outer row of the deformation area; the splay braces or scissors must be erected. on a solid, reliable foundation.
3. If the deflection of the cantilevered steel beam on which the scaffolding is rooted is deformed and exceeds the specified value, the anchorage point behind the cantilevered steel beam should be reinforced, and the steel beam should be tightened with steel support and U-shaped drag to hold the roof. There is a gap between the embedded steel ring and the steel beam, and a horse wedge should be used to prepare it tightly; in addition, the wire ropes at the outer end of the hanging steel beam should be checked one by one and all tightened to ensure uniform stress.